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Nylon bushings for easy adjustment and quiet setting of blades running parallel to shortest dimension
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Smoke Test and More Information on MA Series Diffusers
904 - Double Deflection Adjustable Aluminum Blade Grille For a 38" x 18" Duct Opening (front blades parallel to shortest dimension)
2" Round 3 Hour Vertical Fire Door 2565-22 Commercial Nylon bushings for easy adjustmenth3. 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 *
