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Ships within 48 hours · Estimated delivery Aug 19 - Aug 24
3/4” Wide x 3/4” High square holes
Spiral pipe diameter must be 4” larger than Height of the duct opening
with 53% free area
* 2650 - Round spring actuated (6) damper for vertical or horizontal mount
4" Round Horizontal/Vertical Fire Damper 2650-4 Accessories 3/4” Wide x 3/4” Highh3. Standard Features * 2649 Round damper for vertical mount only. Available 4" thru 52" round. * 2650 Round spring actuated (6) damper for vertical or horizontal mount. Available 4" thru 52" round. * UL and California State Fire Marshall approved * 4 1 4" standard frame style * Interlocking steel roll formed blade (3) with roll formed frames (1) * Blade lock (5) * Damper manufactured from corrosion tested galvanized mild steel (G 90) * Self locking
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