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Concealed mounting holes with mounting screws
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* 2550 - Round Spring actuated (6) damper for vertical or horizontal mount
* UL and California State Fire Marshall approved * 4-1/4" standard frame style * Maximum dimension 60w
1/4" cross bars
4" 3 Hour Vertical Mount Fire Door 2665-5 Step Down Ceiling Diffuser Concealed mounting holes with mountingh3. 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"
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