Casement Rectangular UPVC Low Threshold Door, Feature : Fine Finished, Perfect Shape

high performance in term of air and water tightness, dust, insects, sound reduction requires sealing of the full sash perimeter. Any low threshold or threshold less arrangement will compromise the perfomance aim but traditional living habits combined with ergonomics are today’s overriding factors for fenestration. Okna is offering, whenever possible, aluminium low threshold solutions or provide suggetions on how to prepare ground levels to hide the unwanted, highr frame upstand associatedwith fold & slied patio doors and tilt & slide patio doors.okna has chosen purposely aluminium thresholds with silver anodised finsh to provide a hard wearing foundation for years of product durability.