4" 3 Hour Vertical Mount Fire Door 2665-12 Smoke-Fire Damper Designed to handle high volumes

Designed to handle high volumes of air with horizontal flow

Steel construction

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

3/16" cross bars

4" 3 Hour Vertical Mount Fire Door 2665-12 Smoke-Fire Damper Designed to handle high volumesh3. 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"