4" 3 Hour Vertical Mount Fire Door 2661-24X20 Smoke-Fire Damper 055 T6 extruded aluminum *

055 T6 extruded aluminum * Five air patterns: 700 CB10 - one way

2550 Series Engineering/Performance Data

available with one

Standard Features *Surface mount diffuser * Nylon bushings for easy adjustment and quiet setting of steel blades * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Single deflection diffuser with adjustable steel blades * Steel blades are parallel to longest dimension * Allows 2-way air deflection on one plane * Soft White Options * 931 O - with recessed screwdriver operated opposed blade damper * 1331 and 1332 Series - stainless steel single deflection * Tamper proof screws * Standard Color or Design Color Finish available on this product

PERFORMANCE DATA 915 Series Engineering/Performance Data

4" 3 Hour Vertical Mount Fire Door 2661-24X20 Smoke-Fire Damper 055 T6 extruded aluminum *h3. 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"