Bangalore, Karnataka, India
Our Product / Services
Ventilation is the process by which clean air (normally outdoor air) is intentionally provided to a space and stale air is removed. This may be accomplished by either natural or mechanical means.
Industrial ventilation is a method of controlling worker exposure to airborne toxic chemicals or flammable vapors by exhausting contaminated air away from the work area and replacing it with clean air.
Ventilation is needed to provide oxygen for metabolism and to dilute metabolic pollutants (carbon dioxide and odour). It is also used to assist in maintaining good indoor air quality by diluting and removing other pollutants emitted within a space but should not be used as a substitute for proper source control of pollutants. Ventilation is additionally used for cooling and (particularly in dwellings) to provide oxygen to combustion appliances. Good ventilation is a major contributor to the health and comfort of building occupants.
Design Parameter to be considered for Air Quantitywill be based on:- ASHRAE Ventilation Standard or Air Change Rate (ACH)- Area and occupancy
a) An Exhaust/Extraction system is designed to remove foul air, usually at high level, unless the fumes are heavier than air, when extraction would take place near floor level. This extraction creates an area of negative pressure causing the fresher replacement air to flow into the room through doors, windows, or through suitably spaced low level intake grilles. This is by far the most common, economical and simplest system for normal ventilation work.
b) An Intake/Treated Fresh Air system - blows in fresh air, which mixes with the air already in the room and forces its way out to the atmosphere through any available openings. Careful location and speed control of intake fans and evenly distributed air supply diffusers are necessary to prevent draughty conditions. Even in warm weather, incoming air may need to be tempered and/or filtered, in which case careful planning should be given to the position of the diffusers. If filtered air is required, an intake system is essential, and the room should be under a slight positive pressure, so that any leakage of air is outwards from the room.
c) A Combined system/Dilute Ventilation system using both exhaust and supply systems can be more effective than extract only in large offices, as controlled mechanical intake can be used to give positive gentle air movement in warm weather to create a feeling of freshness. It also reduces the number and size of openings required in the structure for replacement fresh air. Heat Recovery units can be incorporated in this type of system for energy saving during the Winter months and under certain conditions, a degree of cooling during spring and early summer. Where buildings are air conditioned, these savings will continue in the summer.
Positive pressure is when a room inside the building is held at a higher pressure than the surrounding rooms. Or to put it another way, positive pressure occurs when more airflow is pumped into a room than airflow drawn out. This ensures any air leaks in the room will flow from inside the room to the outside. This is most commonly used in clean room applications to prevent airborne contaminants from outside the room leaking in.
Negative pressure is when a room inside the building is held at a lower pressure than the surrounding rooms. Or to put it another way, negative pressure occurs when more airflow is drawn out of a room then airflow pumped in. This ensures any air leaks in the room will flow from outside the room to the outside. This is most commonly used in hospital isolation rooms to prevent airborne viruses or bacteria from escaping the room into other rooms.
Roof Extractors are particularly recommended in India where more than one side of the shop is fully open to the atmosphere, thereby having an excellent air input. The hot air tends to rise upwards and when it is extracted through the Roof Unit; there is substantial inflow of fresh air which causes a reduction in the room temperature
The Bifurcated fans having cast Aluminum alloy impeller, aero foil section blade with MS Casing. This fan is mostly placed to exhaust or supply the air of corrosive nature or hazardous for the motor. In this the motor is not the stream of air, this remain protected from the particles available in the air.
Centrifugal fans consist of a wheel or a rotor mounted on a shaft that rotates in a scroll-shaped housing. Air enters at the eye of the rotor, makes a right-angle turn, and is forced through the blades of the rotor by centrifugal force into the scroll-shaped housing. The centrifugal force imparts static pressure to the air. The diverging shape of the scroll also converts a portion of the velocity pressure into static pressure.
There are three main types of centrifugal fans: Radial blade fans- Radial-blade fans are used for heavy dust loads. Their straight, radial blades do not get clogged with material, and they withstand considerable abrasion. These fans have medium tip speeds and medium noise factors.
Backward curved blade fans- Backward-blade fans operate at higher tip speeds and thus are more efficient. Since material may build up on the blades, these fans should be used after a dust collector. Although they are noisier than radial-blade fans, backward-blade fans are commonly used for large-volume dust collection systems because of their higher efficiency.
Forward curved blade fans- These fans have curved blades that are tipped in the direction of rotation. They have low space requirements, low tip speeds, and a low noise factor. They are usually used against low to moderate static pressures.
