915 - FIXED 45° BLADE GRILLE 915-42X22 Damper:without Damper Standard collar diameter is the

Standard collar diameter is the same as the diffuser size

3/4" round collar

425 Series Engineering/Performance Data

3 hour fire resistance rating

MRI Compatible

915 - FIXED 45° BLADE GRILLE 915-42X22 Damper:without Damper Standard collar diameter is theStandard Features Extruded aluminum surface mount frame with signature line marks Extruded aluminum fixed bar blades at 45 Blades are parallel to the longest dimension Designed to minimize vision into the air duct Center margins are mounted on the backside of the grille for a streamlined continuous look Countersunk mounting holes with color matching Phillips Pozidriv screws Rust resistant pre coat with durable powder finish Soft White Options Recessed