4" 3 Hour Vertical Mount Fire Door 2665-48 Step Down Ceiling Diffuser Standard Features * 1/2" spacing

Standard Features * 1/2" spacing dual angular louvers * 22 & 20 gauge cold roll steel * Install with louvers in up or down position for best duct concealment * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Soft White Options * 1033 - 1/3" spacing available in limited sizes * A-1050 -

3-way register with stiffened 1/2" fan shaped louvers for silent operation

Extended sleeve (2751)

Allows for 4-way airflow

951 Series Engineering/Performance Data

4" 3 Hour Vertical Mount Fire Door 2665-48 Step Down Ceiling Diffuser Standard Features * 1/2" spacingh3. 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"