FM Bracket, 4" Square, Red Alarm Box, Welded, Metallic. Depth: 3-1/2". Side Knockouts(10) 1/2" & 3/4" (concentric). Bottom Knockouts: (4) 1/2" & 3/4" (concentric). End Knockouts: (8) KOs. Cubic Inches: 40.5". UL Listed for Use in 2 Hour Fire Rated Walls.
- Color: Red
- Depth: 3 1/2 in
- Knockout Diameter: 1/2 in
- Knockout Diameter: 3/4 in
- Mounting: Bracket
- Mounting: Screw On
- Material: Steel
- Color: Red
- Mounting: Nail On
- Color: Red
- Cubic Inches: 40.500 in³