3 Hour Out Of Air Fire Door Grille 2563-16X16 Step Down Ceiling Diffuser Blades spaced at 2/3"

Blades spaced at 2/3"

904 - Double Deflection Adjustable Aluminum Blade Grille For a 42" x 18" Duct Opening (front blades parallel to shortest dimension)

Standard Features * 1/2" spaced vision-proof dual angular louvers for strength and maximum free area * Margin edges are 7/8" projection for baseboard installation * Soft White with color matching screws Options * 1133 - 1/3" spaced dual angular louvers * 1175 - added mullion stiffeners for greater strength * Standard Color

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

3 Hour Out Of Air Fire Door Grille 2563-16X16 Step Down Ceiling Diffuser Blades spaced at 2/3"h3. 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 *