3 Hour Out Of Air Fire Door Grille 2563-16X16 Step Down Ceiling Diffuser Standard Features * Heavy duty

Standard Features * Heavy duty honeycomb construction * Blades run parallel to longest dimension given * Gym Grade - includes welded core and extra supports for heavy duty application * Mounting holes for sidewall and ceiling application * Recessed screwdriver operated opposed blade damper to control air volume for positive balance of system * Soft White Options * No mounting holes * Tamper Proof Screws * Standard Color

Recommended Minimum Sleeve Thickness for Fire Dampers

Note: Sizes are Listed Nominal Duct Opening

904 - Double Deflection Adjustable Aluminum Blade Grille For a 18" x 12" Duct Opening (front blades parallel to shortest dimension)

Individually welded 14 guage diffusion bars

3 Hour Out Of Air Fire Door Grille 2563-16X16 Step Down Ceiling Diffuser Standard Features * Heavy dutyh3. Standard Features * 2561 Square or rectangular fire door for vertical mount only. Maximum dimension 48w, 49h. For damper free area chart A click here * 2563 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 48w, 41h. For damper free area chart B click here * 2565 Round fire door for vertical mount only. Available 4" thru 40" round. * UL and California State Fire Marshall approved * 2" thinline frame *