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Heavy Duty Construction
904 - Double Deflection Adjustable Aluminum Blade Grille For a 38" x 18" Duct Opening (front blades parallel to shortest dimension)
1 1/2 hour fire resistance rating
TVB - Thermal Vapor Blanket
115T Series Engineering/Performance Data
4" 3 Hour Vertical Mount Fire Door 2661-60X30 Step Down Ceiling Diffuser Heavy Duty Constructionh3. Standard Features * 2661 Square or rectangular fire door for vertical mount only. Maximum dimension 60x60. For damper free area chart A click here * 2663 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 60w x 52h. For damper free area chart B click here * 2665 Round fire door for vertical mount only. Available 4" thru 52" round. * 3 hour rated * UL and California State Fire Marshall approved * 4 1 4"
