Specifications – Series HDRG

Heavy Duty Extruded Aluminum Fixed Blade Return Grille
 HDRG-1 Surface Mount

Air Inlets shall be model HDRG manufactured by GREENHECK. Units shall be heavy duty return or exhaust grilles of extruded aluminum construction.

Extrusion thickness shall be equal or greater than the equivalent of 14 gauge steel. Units shall be designed to withstand moderate physical abuse. The units shall be the size and quantity as outlined in the plans and specifications.

Border shall be 1 5/8" wide with aerodynamically shaped curved blades on 1 1/3" centers. Deflector blades shall be fixed in place with heavy alloy metal screws.

Units shall be designed for surface mounting applications and be provided with counter sunk screw holes on the face of the device.

Damper Accessories (Optional)
Optional opposed blade damper shall be constructed of steel (Model OBD) or aluminum (Model OBDA). Damper must be operable from the face of the diffuser.

Performance Specification
The manufacturer shall provide published performance data. Data shall be tested in accordance to ANSI/ASHRAE Standard 70- 2006

 Paint Specification
 Process shall be anodic electrodeposition using an anodic acrylic paint. Units shall undergo pre‐     treatment including a pressurized spray stage using an alkaline cleaner and a de‐ionized water rinse.