We are offering modular wet ventilation system.usha die casting industries (industrial equipment division)" offers well engineered proven designs and constructions for evaporative cooling wet ventilation systems / air washers. humidification is rapidly gaining importance in many industries. The requirements of modern high-speed production techniques and increases in internal plant heat loads often result in the need for better control of humidity levels in the plant environment. Many industries face stringent indoor air quality standards. Meeting these standards can often require bringing more outside air into the plant. If this outside air is dry or cold the result can be much lower indoor humidity levels. We undertake design, supply, erection and commissioning of equipment and project of industrial humidification and ventilation systems on turnkey basis.

we can offer such systems in completely modular & pre fabricated constructions or in civil constructed chambers with installed modular system components.
operation of a wet ventilation system / air washer :-

the basic components of an air washer system is a chamber that contain a series of

• evaporative cooling pads with top water spray system
• an eliminator section that removes water from the air that is exiting the air washer
• sump which catches both the sprinkled water droplets and the water that was collected by the eliminators.

the evaporative cooling pad section will either add moisture to the air or dehumidify the air.

the eliminator section in many cases is a "w" or a series of "w"s in shape. This section, forces the air to contact the eliminator components, which in turn knocks down water droplets and air borne solids.

the sump is the collection basin for the system. The washed out solids, lint, dust, and water all collect in this area.
an air washer will humidify the air during the seasons when the outside air is low in humidity. This is usually during the peak summer / in arid climates. The reason that the air is humidified, is to create the proper condition for the operation of the plant. In the production of textiles, electronics, and other related industries, where the humidity of the air is crucial for the air quality and material production, the air washer will balance the required humidity of the plant air by humidifying the air during the dry seasons, and dehumidifying the air when the air conditions are more humid than the plant requires.

with evaporative cooling, a complete air change of the room takes place. This offers a great health advantage over traditional refrigerated air conditioning, which employs a complicated "closed" system that recirculates the same stale dry air over and over. Constant cool air movement pushes heat out -- along with stale air, smoke, odors and pollution. The high volume of fresh, cool air produced by the evaporative cooler helps your body ventilate naturally .evaporative cooling helps maintain natural humidity level.

generally our evaporative type wet ventilation systems / air washers consists of following components / modules
prefabricated wet ventilation chamber / civil constructed chamber as per our designcentrifugal didw fan / axial flow faninlet bird screenductinginlet screen louveresoutlet louveresinlet mirov pre filterswater distribution system with sump & spray pipingprimary microv filtersfasteners / gasketssecondary microv filters (optional)air tight doorsevaporative cooling padsinstrumentation like manometers / hygrometersmist eliminatorswet bulb thermometers
prefabricated wet ventilation chamber / civil constructed chamber as per our design :-
prefabricated chamber is supplied in case of space limitations / time limitatons for project completion or on specific request from customer. The chamber is either completely fabricated or supplied in form of panels for site assembly and erection. In either case heavy gauge steel is used with additional double coats of red oxide primer and two coats of epoxy based colour. In special cases chambers made of ss or lined with frp are also supplied for long life.

these are well fabricated to prevent any leakages after final assembly.

civil constructed chambers are more suitable for long life and sturdy operation. These are usually built by customer as per designs / drawings provided by us. These are generally large rooms having ample space for maintenance and other daily operational activities.

inlet bird screen :-
welded wire mesh screens are provided either before inlet screening louvers or before inlet microv prefilters. The screen prevents birds or any other unauthorized personnel to tamper / damage the pre filters or the system in general.

the screen is made in steel flat panels and is very easy to mount in bolted design.

inlet screen louveres :- z section louvers are made in modular bolted panels mounted just before microv prefilters. These help protect the microv prefilters from atmospheric dust / rains / direct sunlight and any physical tampering from outside of system.

louvers are made from medium gauge steel and fabricated to be light in weight to facilitate easy installations.

inlet microv prefilters :-
generally inlet microv prefilters are provided for screening large dust particles in the range of 50 microns to 15 microns depending upon applications.


the inlet microvprefilters are of hdpe construction. These can be supplied in frames of different materials of constructions like ms / ss / aluminum. All filters come in standard sizes and interchangeable. Each filter is provided with rubber gaskets, fasteners if required for flange types. Sliding type arrangements are also available. These filters are washable in case they get choked with dirt & dust.

primary microv filters :-
generally primary microv prefilters are provided for screening dust particles in the range of 10 microns to 5 microns depending upon applications.

the primary microvfilters are hdpe construction. These can be supplied in frames of different materials of constructions like ms / ss / aluminum. All filters come in standard sizes and interchangeable. Each filter is provided with rubber gaskets, fasteners if required for flange types. Sliding type arrangements are also available. These filters are washable in case they get choked with dirt & dust.


secondary microv filters :-
generally secondary microv filters are provided for screening dust particles in the range of 3 microns to 2 microns depending upon applications. The use of these filters increases the pressure drop of the system causing more higher size selection & power consumption of fan equipment and thereby increasing the system capital cost and running cost.

the secondary microvfilters are hdpe construction. These can be supplied in frames of different materials of constructions like ms / ss / aluminum. All filters come in standard sizes and interchangeable. Each filter is provided with rubber gaskets, fasteners if required for flange types. Sliding type arrangements are also available. These filters are washable in case they get choked with dirt & dust.

evaporative cooling pads :-
the evaporative cooling pad / media is cellulose material impregnated with insoluble anti-rot salts and rigidify saturates. The material has spatial crossing linking technology with high absorb ability. It is water resistant, anti-mildew and has long service life.

internal geometry of cooling pads is of transverse 45 degree and 15 degree alternating flutes. The 45 degree flute carries the water to the intake side of the media while the 15 degree flute is aligned with the direction of air flow. This flute arrangement is self-cleaning and increases cooling efficiency by causing air turbulence while air is traveling through the media.

the media must be installed in a proper orientation to the air flow. The 45 degree flute must be aligned upwards in the direction of the air flow (intake side of the flute must be lower than the discharge side) and the 15 degree flute must be aligned downwards with the air flow (intake side of the flute must be higher than the discharge side). If the media is aligned improperly, the water will flow to the discharge side of the media and can be easily entrained in the air flow.

efficiency of evaporative cooling media is upto 90% at 2.5 m/sec face velocity for 300 mm media depth.

life expectancy is dependent upon many factors but is usually 3 to5 years when properly maintained and water ph is between 6 and 8.

cooling efficiency :-

cooling efficiency is based on "saturation efficiency" (ability to transfer water vapor into the air stream). The two factors to be considered in determining the efficiency of the media are media thickness and air flow face velocity .

it is necessary to know the dry bulb temperature and wet bulb temperature entering the media to be able to apply the percent efficiency.

mist eliminators :-
these are provided after the evaporative cooling media to entrain any carryover water droplets in the air stream.

the eliminator section in many cases is a "w" or a series of "w"s in shape. This section, forces the air to contact the eliminator components, which in turn knocks down water droplets and air borne solids.

centrifugal didw fan / axial flow fan heavy duty symbiosis brand centrifugal double inlet double width (didw) fan / axial flow tube fan is provided as per requirements for prefabricated air washers / civil constructed air washing systems.


the fan shall be capable of delivering air volume at external static pressure as specified. For didw fan the discharge mode shall be down, side or up as specified. The fan shall have a solid, ground and polished steel shaft with a lubricate self-aligning type bearing on each end.

motor shall be totally enclosed fan cooled (tefc) type as specified and sized to drive the fan at specified capacity without exceeding nameplate rating. Electrical characteristics of the motor shall comply with available electrical services as specified. Motor mount shall be adjustable to allow for drive belt tension and alignment.

vibration isolation shall be provided under the fan and motor. Isolators shall be selected for minimum deflection. Flexible connector shall be attached between the fan discharge and the cabinet.

didw fan is generally provided in ms construction. The impeller and casing are coated with double coat epoxy paint for long life or on specific request from customer frp lined for corrosion resistance. Ss 304 casing and impeller can also be provided as per customer requirements and applications.

axial flow fan tube is coated with double coat epoxy paint for long life or on specific request from customer frp lined for corrosion resistance. Ss 304 casing and impeller can also be provided as per customer requirements and applications.

axial flow fan blades are cast aluminum and bolted to central hub. This facilitates easy removal / maintenance of impeller. Didw centrifugal fan impeller & axial flow fan blade is dynamically balanced on computerized balancing machine to give trouble free & smooth running performance.


ducting :-
outlet delivery ducting is provided after the discharge end of the air washer chamber for air distribution inside the room. As per customer requirements this ducting can be made in materials like gi / ms / ss.

outlet louvers :-
outlet louvers are provided at discharge end of the duct for proper throw of air at required position in the room. These louvers can be provided as fixed or adjustable type as per customer requirements.

water distribution system with sump & spray piping :-
stainless steel couplings with female pipe thread shall be welded into the sump and side to provide for make-up water, overflow and drain.

water distribution system shall be pump re-circulating system with mechanical float valve assembly to maintain water level in the sump. Pump horsepower and voltage requirements shall be as specified by customer. A bleed-off system with metering valve, if required, shall be provided when the pump system is used. Bleed-off rate shall be minimum of 21% of evaporation rate. Pump shall be sized to deliver water flow rate at the head and pressure required. Flow rate shall be determined at three (3) times the evaporation rate plus the bleed-off rate. Pump will be monoblock type standard with impeller moc as per customer specifications.

internal plumbing shall be pvc or ss 304 schedule 40 sized to meet flow rate demand unless otherwise specified. A balancing valve shall be provided in the riser pipe between the source and header to regulate water flow over the media. Header pipe shall contain drilled and cleaned orifice holes sized to assure proper water flow over the media. Water from the header pipe shall be discharged upwards against a stainless steel deflector to redirect the water from the header pipe back onto the media, evenly across its' full width. A union shall be provided in the riser pipe below the header pipe to facilitate removal of the header pipe.

fasteners / gaskets :-
all fasteners shall be ss or gi for all bolted joints. gaskets shall be of asbestos or neoprene rubber type as per specific request from customer.

air tight doors :-
all access doors to the prefabricated chamber / civil constructed chamber shall be air tight with proper gasket sealing and locking system. The doors shall be sized adequate for movement of manpower , miscellenous tools tackles, cooling media, piping material for regular maintenance work.

to enquire about the desired product(s), just check the box and then click inquiry now button which is provided below.

High efficiency low noise equipment installed in residential building.

we are regular supplies for aerofoil bladed kitchen fume exhaust blowers across india & abroad

We are offering modular wet ventilation system. Usha die casting industries (industrial equipment division)" offers well engineered proven designs and constructions for evaporative cooling wet ventilation systems / air washers. humidification is rapidly gaining importance in many industries. The requirements of modern high-speed production techniques and increases in internal plant heat loads often result in the need for better control of humidity levels in the plant environment. Many industries face stringent indoor air quality standards. Meeting these standards can often require bringing more outside air into the plant. If this outside air is dry or cold the result can be much lower indoor humidity levels. We undertake design, supply, erection and commissioning of equipment and project of industrial humidification and ventilation systems on turnkey basis.

we can offer such systems in completely modular & pre fabricated constructions or in civil constructed chambers with installed modular system components.
operation of a wet ventilation system / air washer :-

the basic components of an air washer system is a chamber that contain a series of

• evaporative cooling pads with top water spray system
• an eliminator section that removes water from the air that is exiting the air washer
• sump which catches both the sprinkled water droplets and the water that was collected by the eliminators.

the evaporative cooling pad section will either add moisture to the air or dehumidify the air.

the eliminator section in many cases is a "w" or a series of "w"s in shape. This section, forces the air to contact the eliminator components, which in turn knocks down water droplets and air borne solids.

the sump is the collection basin for the system. The washed out solids, lint, dust, and water all collect in this area.
an air washer will humidify the air during the seasons when the outside air is low in humidity. This is usually during the peak summer / in arid climates. The reason that the air is humidified, is to create the proper condition for the operation of the plant. In the production of textiles, electronics, and other related industries, where the humidity of the air is crucial for the air quality and material production, the air washer will balance the required humidity of the plant air by humidifying the air during the dry seasons, and dehumidifying the air when the air conditions are more humid than the plant requires.

with evaporative cooling, a complete air change of the room takes place. This offers a great health advantage over traditional refrigerated air conditioning, which employs a complicated "closed" system that recirculates the same stale dry air over and over. Constant cool air movement pushes heat out -- along with stale air, smoke, odors and pollution. The high volume of fresh, cool air produced by the evaporative cooler helps your body ventilate naturally .evaporative cooling helps maintain natural humidity level.

generally our evaporative type wet ventilation systems / air washers consists of following components / modules
prefabricated wet ventilation chamber / civil constructed chamber as per our designcentrifugal didw fan / axial flow faninlet bird screenductinginlet screen louveresoutlet louveresinlet mirov pre filterswater distribution system with sump & spray pipingprimary microv filtersfasteners / gasketssecondary microv filters (optional)air tight doorsevaporative cooling padsinstrumentation like manometers / hygrometersmist eliminatorswet bulb thermometers
prefabricated wet ventilation chamber / civil constructed chamber as per our design :-
prefabricated chamber is supplied in case of space limitations / time limitatons for project completion or on specific request from customer. The chamber is either completely fabricated or supplied in form of panels for site assembly and erection. In either case heavy gauge steel is used with additional double coats of red oxide primer and two coats of epoxy based colour. In special cases chambers made of ss or lined with frp are also supplied for long life.

these are well fabricated to prevent any leakages after final assembly.

civil constructed chambers are more suitable for long life and sturdy operation. These are usually built by customer as per designs / drawings provided by us. These are generally large rooms having ample space for maintenance and other daily operational activities.

inlet bird screen :-
welded wire mesh screens are provided either before inlet screening louvers or before inlet microv prefilters. The screen prevents birds or any other unauthorized personnel to tamper / damage the pre filters or the system in general.

the screen is made in steel flat panels and is very easy to mount in bolted design.

inlet screen louveres :- z section louvers are made in modular bolted panels mounted just before microv prefilters. These help protect the microv prefilters from atmospheric dust / rains / direct sunlight and any physical tampering from outside of system.

louvers are made from medium gauge steel and fabricated to be light in weight to facilitate easy installations.

inlet microv prefilters :-
generally inlet microv prefilters are provided for screening large dust particles in the range of 50 microns to 15 microns depending upon applications.


the inlet microvprefilters are of hdpe construction. These can be supplied in frames of different materials of constructions like ms / ss / aluminum. All filters come in standard sizes and interchangeable. Each filter is provided with rubber gaskets, fasteners if required for flange types. Sliding type arrangements are also available. These filters are washable in case they get choked with dirt & dust.

primary microv filters :-
generally primary microv prefilters are provided for screening dust particles in the range of 10 microns to 5 microns depending upon applications.

the primary microvfilters are hdpe construction. These can be supplied in frames of different materials of constructions like ms / ss / aluminum. All filters come in standard sizes and interchangeable. Each filter is provided with rubber gaskets, fasteners if required for flange types. Sliding type arrangements are also available. These filters are washable in case they get choked with dirt & dust.


secondary microv filters :-
generally secondary microv filters are provided for screening dust particles in the range of 3 microns to 2 microns depending upon applications. The use of these filters increases the pressure drop of the system causing more higher size selection & power consumption of fan equipment and thereby increasing the system capital cost and running cost.

the secondary microvfilters are hdpe construction. These can be supplied in frames of different materials of constructions like ms / ss / aluminum. All filters come in standard sizes and interchangeable. Each filter is provided with rubber gaskets, fasteners if required for flange types. Sliding type arrangements are also available. These filters are washable in case they get choked with dirt & dust.

evaporative cooling pads :-
the evaporative cooling pad / media is cellulose material impregnated with insoluble anti-rot salts and rigidify saturates. The material has spatial crossing linking technology with high absorb ability. It is water resistant, anti-mildew and has long service life.

internal geometry of cooling pads is of transverse 45 degree and 15 degree alternating flutes. The 45 degree flute carries the water to the intake side of the media while the 15 degree flute is aligned with the direction of air flow. This flute arrangement is self-cleaning and increases cooling efficiency by causing air turbulence while air is traveling through the media.

the media must be installed in a proper orientation to the air flow. The 45 degree flute must be aligned upwards in the direction of the air flow (intake side of the flute must be lower than the discharge side) and the 15 degree flute must be aligned downwards with the air flow (intake side of the flute must be higher than the discharge side). If the media is aligned improperly, the water will flow to the discharge side of the media and can be easily entrained in the air flow.

efficiency of evaporative cooling media is upto 90% at 2.5 m/sec face velocity for 300 mm media depth.

life expectancy is dependent upon many factors but is usually 3 to5 years when properly maintained and water ph is between 6 and 8.

cooling efficiency :-

cooling efficiency is based on "saturation efficiency" (ability to transfer water vapor into the air stream). The two factors to be considered in determining the efficiency of the media are media thickness and air flow face velocity .

it is necessary to know the dry bulb temperature and wet bulb temperature entering the media to be able to apply the percent efficiency.

mist eliminators :-
these are provided after the evaporative cooling media to entrain any carryover water droplets in the air stream.

the eliminator section in many cases is a "w" or a series of "w"s in shape. This section, forces the air to contact the eliminator components, which in turn knocks down water droplets and air borne solids.

centrifugal didw fan / axial flow fan heavy duty symbiosis brand centrifugal double inlet double width (didw) fan / axial flow tube fan is provided as per requirements for prefabricated air washers / civil constructed air washing systems.


the fan shall be capable of delivering air volume at external static pressure as specified. For didw fan the discharge mode shall be down, side or up as specified. The fan shall have a solid, ground and polished steel shaft with a lubricate self-aligning type bearing on each end.

motor shall be totally enclosed fan cooled (tefc) type as specified and sized to drive the fan at specified capacity without exceeding nameplate rating. Electrical characteristics of the motor shall comply with available electrical services as specified. Motor mount shall be adjustable to allow for drive belt tension and alignment.

vibration isolation shall be provided under the fan and motor. Isolators shall be selected for minimum deflection. Flexible connector shall be attached between the fan discharge and the cabinet.

didw fan is generally provided in ms construction. The impeller and casing are coated with double coat epoxy paint for long life or on specific request from customer frp lined for corrosion resistance. Ss 304 casing and impeller can also be provided as per customer requirements and applications.

axial flow fan tube is coated with double coat epoxy paint for long life or on specific request from customer frp lined for corrosion resistance. Ss 304 casing and impeller can also be provided as per customer requirements and applications.

axial flow fan blades are cast aluminum and bolted to central hub. This facilitates easy removal / maintenance of impeller. Didw centrifugal fan impeller & axial flow fan blade is dynamically balanced on computerized balancing machine to give trouble free & smooth running performance.


ducting :-
outlet delivery ducting is provided after the discharge end of the air washer chamber for air distribution inside the room. As per customer requirements this ducting can be made in materials like gi / ms / ss.

outlet louvers :-
outlet louvers are provided at discharge end of the duct for proper throw of air at required position in the room. These louvers can be provided as fixed or adjustable type as per customer requirements.

water distribution system with sump & spray piping :-
stainless steel couplings with female pipe thread shall be welded into the sump and side to provide for make-up water, overflow and drain.

water distribution system shall be pump re-circulating system with mechanical float valve assembly to maintain water level in the sump. Pump horsepower and voltage requirements shall be as specified by customer. A bleed-off system with metering valve, if required, shall be provided when the pump system is used. Bleed-off rate shall be minimum of 21% of evaporation rate. Pump shall be sized to deliver water flow rate at the head and pressure required. Flow rate shall be determined at three (3) times the evaporation rate plus the bleed-off rate. Pump will be monoblock type standard with impeller moc as per customer specifications.

internal plumbing shall be pvc or ss 304 schedule 40 sized to meet flow rate demand unless otherwise specified. A balancing valve shall be provided in the riser pipe between the source and header to regulate water flow over the media. Header pipe shall contain drilled and cleaned orifice holes sized to assure proper water flow over the media. Water from the header pipe shall be discharged upwards against a stainless steel deflector to redirect the water from the header pipe back onto the media, evenly across its' full width. A union shall be provided in the riser pipe below the header pipe to facilitate removal of the header pipe.

fasteners / gaskets :-
all fasteners shall be ss or gi for all bolted joints. gaskets shall be of asbestos or neoprene rubber type as per specific request from customer.

air tight doors :-
all access doors to the prefabricated chamber / civil constructed chamber shall be air tight with proper gasket sealing and locking system. The doors shall be sized adequate for movement of manpower , miscellenous tools tackles, cooling media, piping material for regular maintenance work.

to enquire about the desired product(s), just check the box and then click inquiry now button which is provided below.

"Usha Die Casting Industries (Industrial Equipment Division)" Specializes in the Custom Design & Manufacture of SYMBIOSIS Brand Industrial Fans and Blowers in materials of construction like MS, CS, SS, FRP Lined and in Impeller types like Backward Curved and Radial Blades.

We offer a complete range of Sizes and Impeller Designs which allow us to meet all Industrial Air Moving requirements. Our company success is based upon our Experience, High degree of flexibility, Excellent product range and a Strong commitment to Quality Assurance.

Regardless of the type of fan we recognize that Reliability is of prime importance. We understand that downtime is expensive for our clients and we do the Utmost to Design and Build our Fans with Reliability and Low Maintenance in mind.

We cater to numerous applications for Blowers in industries and areas like.

Steel Plants	Furnace
Palletizing Plants	Boilers
Aluminum Smelters	Textile machinery
Fertilizer & Petrochemical industry	Oil & Gas Exploration Installations
Fumes Exhaust for Welding and Painting	Chemical & Paper Industry
Air Pollution Control systems	Coal Handling
Incineration	Cement & Lime
Wooden Furniture manufacturing	Pharmaceutical & Dairy
Man cooling application in hot areas	Foundries

The design of a centrifugal fan is mainly determined by the geometrical conditions of the installation. The following gives an overview of our most common designs. In addition we manufacture a large number of special designs to customer specifications.
Types :-

• Direct Drive :- In most cases one attempts to use a direct drive. It is more compact, has less parts to be serviced and in most cases is cheaper than other designs.
• V-Belt Drive :- When fan speeds that cannot be achieved with direct drives or there are installation specific requirements, a V- belt drive is used. The motor mounting can be done in a number of different ways.
• Coupling Drive :- For accommodating a starting torque or variable torque e.g. when using the fan for material transport to be dampened while protecting the motor, then a drive using an elastic coupling is being used.
• Drive Positions :- Installation positions and direction of rotation of the Impeller for Centrifugal Fans defined from the Drive Side is given as below

Note :-

• Outlet positions viewed from Drive side
• Fan Construction as per Application needs

Optimized Direct Drive Selection :-
As compared to belt-drive fan arrangements, direct drive fans are more compact, require less maintenance, and generally have a lower first cost. However, relative to belt-drive fans, they are limited in application, size, available features, and the ability to adjust to performance.


A major objection to direct-drive arrangements in the past was the inability to adjust fan speed if system requirements changed. With the advent of variable frequency drives (VFDs) the speed, and therefore performance, of direct-drive fans can now be adjusted to meet varying requirements.

Given the variety of operating speeds available, the only cost-effective method for selecting todays direct-drive fans is software selection programs of SYMBIOSIS Blowers.

Optimized V Belt Drive Selection :-
In the lower horsepower ranges, V-belt drive selection is relatively simple, but as horsepower
requirements increase, V-belt drive selection becomes more complicated and requires more consideration of the drives effects on fan and motor bearings.

Optimized Heat Application Selection :-

Fans handling hot airstream must be kept in operation after system shutdown until the airstream cools below 125C. to prevent damage to the fan. The fan Impeller or shaft might otherwise distort due to heat-soaking. The shaft cooler is only effective while rotating. Burners should be located so that the air is thoroughly mixed before entering the fan inlet. Improper placement could cause hot spots on the fan wheel which exceed maximum design temperatures.

Plug units Selection for Air Recirculating requirements :-
Plug units are solidly welded, non-overloading fans which can be square panel mounted to the side or top of oven dryer panel. The mounting panel is insulated. These fans are designed for internal operation in furnaces, ovens or kilns where air has to be exhausted, re-circulated, or distributed. Plug units eliminate duct work and special mounting platforms.

Construction Features :-

• Heavy-gauge welded components provide structural strength and durability.
• Continuously welded housings provide the strongest possible construction.
• Shafting is straightened to close-tolerance to minimize run out and ensure smooth operation.
• Lifting eyes provided on all fans.
• Impellers are dynamically balanced
• Bearings are selected to provide long service life through the entire operating range of the fan.

Impeller Designs :-
Radial bladed impeller is non-clogging and is suitable for heavy dust loadings and materials handling. Although this design is less efficient than a backward bladed impeller, this fan can withstand the impact of large solids and the self-cleaning blade configuration prevents the accumulation of residue on the impeller.

Backward Curved Impeller designs generally represent High Efficiency and cost effective Centrifugal Fans for both clean air and light dust loads. The absorbed power curve has a flat peak non-overloading characteristic. Peak efficiency point is on the steeply rising portion of the pressure curve and vastly superior to forward curved and radial wheel designs.

Sound levels for these designs are lowest with the most efficient fan selections.
Special & Customized Constructions :-

• Elevated Temperature Fans :- Fans can be constructed for elevated temperature operation with the addition of shaft cooler and guard and high-temperature paint. Note that the maximum safe Impeller speeds decrease as airstream temperatures increases.
• Spark Resistant Construction for Fans :- Intended to minimize the potential for any two or more fan components to generate sparks within the airstream by rubbing or striking during operation. This is generally exclusively customized as per specific application and requirements of the customer.
• Corrosive Applications :- Special steels or FRP Coating or Rubber Lining is offered for corrosive environment operation of fans.

Balancing & Vibration :-
There are many factors that can have a substantial effect on the Vibration level of air movement equipment; such as Wheel balance, Rotational speed, Drive components, Motor operation and Wiring. Providing equipment that operates well within acceptable Vibration levels requires Consistent Quality in Production and attention to details. At UDCI, we spend the extra time and money required to make this kind of commitment.

Vibration is defined as "the Alternating mechanical motion of an elastic system, components of which are Amplitude, Frequency and Phase." The two components of Vibration that demand utmost attention are Amplitude and Frequency. Amplitude defines how far the Rotating body moves from the center rotating axis, and the frequency is the number of cycles, or revolutions that occur within a specified time period.