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Narrow ceiling grid dimples for 9/16" T-Rails
To adjust diffuser
2750 Install Instructions
904 - Double Deflection Adjustable Aluminum Blade Grille For a 40" x 18" Duct Opening (front blades parallel to shortest dimension)
back blades parallel to longest dimension
2" 3 Hour Vertical Mount Fire Door 2561-36X28 Step Down Ceiling Diffuser Narrow ceiling grid dimples forh3. 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 *
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