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4-way flush step down steel diffuser
Note: Sizes are Listed Nominal Duct Opening
904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 10" Duct Opening (front blades parallel to shortest dimension)
Square to round 2" collar with roll formed retention bead - available in square sizes only
Options * Sleeve variations h3
3 Hour Out Of Air Fire Door Grille 2663-48X32 Commercial 4-way flush step down steelh3. Standard Features * 2661 Square or rectangular fire door for vertical mount only. Maximum dimension 60x60. For damper free area chart A click here * 2663 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 60w x 52h. For damper free area chart B click here * 2665 Round fire door for vertical mount only. Available 4" thru 52" round. * 3 hour rated * UL and California State Fire Marshall approved * 4 1 4"
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