4" Horizontal/Vertical Mount Fire Damper 2634-20X18 Step Down Ceiling Diffuser 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 30" Duct Opening (front blades parallel to shortest dimension)

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For damper free area chart B click here * 2665 - Round fire door for vertical mount only

Uniform 360 degree discharge pattern

Standard Features * 4000 - door core grille with single frame * 4100 - door core grille with additional loose frame *

4" Horizontal/Vertical Mount Fire Damper 2634-20X18 Step Down Ceiling Diffuser 904 - Double Deflection Adjustableh3. Standard Features * 2633 Square or rectangular out of airstream fire damper for vertical mount only. * 2634 Square or rectangular Spring actuated (6) out of airstream fire damper for horizontal or vertical mount. * UL and California State Fire Marshall approved * 4 1 4" standard frame style * Maximum dimension 60w, 52h * Interlocking steel roll formed blade (3) with roll formed frames (1) * Blade lock (5) * Damper manufactured from corrosion