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Square collar designed for 22" x 22" duct
3/4” Wide x 3/4” High square holes
Standard Features * For evaporative cooling or high velocity exhaust applications with divided 2-way multi-louver and combination shut-off * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Soft White
120x120 multiple
Nylon bushings for easy adjustment and quiet setting of blades running parallel to shortest dimension
4" 3 Hour Vertical Mount Fire Door 2661-30X20 Specialty Products Square collar designed for 22"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"
