4" 3 Hour Vertical Mount Fire Door 2661-60X22 T-Bar Concealed mounting holes with mounting

Concealed mounting holes with mounting screws

3 hour fire resistance rating

904 - Double Deflection Adjustable Aluminum Blade Grille For a 14" x 12" Duct Opening (front blades parallel to shortest dimension)

Type 316 stainless steel

Ideal for residential and light commercial application

4" 3 Hour Vertical Mount Fire Door 2661-60X22 T-Bar 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"