4" 3 Hour Vertical Mount Fire Door 2661-36X36 Specialty Products 055 T6 extruded aluminum *

055 T6 extruded aluminum * Square collar * For 22"x22" square duct * Soft White Options * 915 T O - opposed blade damper * No Labor Collar - square to round (2x2 only) * 1x2 panel (10"x22" duct) or 2x4 panel (22"x46" duct) * Satin Anodized Finish available on this product

and 2x4 panels * Soft White

UL listed and tested in accordance with UL Standard 555

Available 4" thru 40" round

Ceramic fiber blade insulation with fiberglass cover*

4" 3 Hour Vertical Mount Fire Door 2661-36X36 Specialty Products 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"