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904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 14" Duct Opening (front blades parallel to shortest dimension)
Minimum size 4"x4"
w/ Tool Operated Opposed Blade Damper
blades prevent metal on metal rattle Countersunk mounting holes with color matching Phillips Pozidriv screws Rust-resistant pre-coat with durable powder finish Soft White Options Screwdriver operated Opposed Blade Damper 2" ADC compliant square to round collar with a bead for ease of installation Heavy Duty Construction MRI Compatible Insect Screen Fractional
For evaporative coolers or central blower systems
2" 3 Hour vertical mount fire door 2561-30x10 Accessories 904 - Double Deflection Adjustableh3. 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 *
