4" Round Horizontal/Vertical Fire Damper 2650-44

h3.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 corner (4) * 165° replaceable fusible link (2) h3.Options * 304 stainless steel construction h3.Installation Instructions * UL approved installation instructions