4" 3 Hour Vertical Mount Fire Door 2661-60X20 Commercial 951 Series Engineering/Performance Data

951 Series Engineering/Performance Data

Holds up to a 2" filter (not included) with filter retention tabs (FG2)

Heavy gauge cold roll steel

4-Way ceiling register with stiffened 1/2" fan shaped louvers for silent operation

Front blades parallel to shortest dimension

4" 3 Hour Vertical Mount Fire Door 2661-60X20 Commercial 951 Series Engineering/Performance Datah3. 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"