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855 Series Engineering/Performance Data
Soft white
Designed to minimize vision into the air duct
Adjustable steel roll formed blades oriented for 1 or 2 way airflow pattern
SD34 Series Performance Data
2" 3 Hour Vertical Mount Fire Door 2561-6X6 Residential Registers & Grilles 855 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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