4" 3 Hour Vertical Mount Fire Door 2661-30X20 Specialty Products 3/4” Wide x 3/4” High

3/4” Wide x 3/4” High square holes

Square collar designed for 22" x 22" duct

Standard Features * Extruded aluminum construction * 45 fixed blades parallel to longest dimension * Margin edges are 7/8" projection for baseboard installation * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Soft White Options * 1100FF - flush frame * Fractional and odd dimension sizes * Standard Color

MRI Compatible

Eighteen air patterns

4" 3 Hour Vertical Mount Fire Door 2661-30X20 Specialty Products 3/4” Wide x 3/4” Highh3. 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"