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375 Series Engineering/Performance Data
Heavy gauge cold roll steel
1600 Series Engineering/Performance Data
904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 20" Duct Opening (front blades parallel to shortest dimension)
2" 3 Hour Vertical Mount Fire Door 2561-48X44 Step Down Ceiling Diffuser 375 Series Engineering/Performance Datah3. 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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