FM Bracket, 4" Square, Red Alarm Box, Welded, Metallic. Depth: 2-1/8". Side Knockouts: (8) 1/2" & (4) 1/2" & 3/4" TKO (eccentric). Bottom Knockouts: (3) 1/2" & (2) 1/2" & 3/4" TKO (eccentric). Cubic Inches: 30.3". UL Listed for Use in 2 Hour Fire Rated Wa
