4" 3 Hour Vertical Mount Fire Door 2661-28X28 Residential Registers & Grilles 1600 Series Engineering/Performance Data

1600 Series Engineering/Performance Data

375 Series Engineering/Performance Data

Smoke Test and More Information on MA Series Diffusers

are enclosed in the valve to assure trouble free operation * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Steel multi-shutter damper * Soft White Options * 845 O - steel lever operated opposed blade damper * Tamper proof screws * Standard Color

Delivers supply air in a 360° air pattern

4" 3 Hour Vertical Mount Fire Door 2661-28X28 Residential Registers & Grilles 1600 Series Engineering/Performance Datah3. 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"