Perforated return air grilles
Applications:
Perforated return air grilles, with or without filter, are the terminal elements of a manifold HVAC system, providing evacuation or recirculation of room air.
Description:
Perforated return air grilles are made of the same profiles as the blade return air grilles, the difference consisting in the front side which is made of punched metal sheet with square or round perforations. If specified in the order, grilles may be provided with detachable, framed filter. For fast removal and easy access for inspection and routine maintenance, they may be ordered with an additional counter-frame. This counter-frame shall remain installed in place, allowing removal of the actual grille alone. On request, this additional counter-frame may be provided with magnetic support elements. In both cases, rated sizes (specified in the order) shall be the frame sizes. For improved adjustment of the air flowrate, the use of OBD dampers is recommended.
