4" 3 Hour Vertical Mount Fire Door 2665-12 Smoke-Fire Damper Standard Features * 1 1/2

Standard Features * 1 1/2 hour rated fire damper * 2549 - Round damper for vertical mount only

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Spiral Diffuser Radius Flush Mount Diffuser Single Deflection with Damper

Steel construction

4" 3 Hour Vertical Mount Fire Door 2665-12 Smoke-Fire Damper Standard Features * 1 1/2h3. 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"