Cubic Foot Rule
Good morning, NFPA 654 2020, N 18.104.22.168.1.1 notes, where an explosion hazard exists, AMSs with a dirty side volume of 8 cubic feet or greater shall be located outside of buildings or adhere to N 9.7.1. We provide AMS with centrifugal separation, cartridge filters, and 4 hp blower. Under our horizontal centrifugal separator, the dust falls by gravity, through a rectangular opening, and into 40 gallon (5.3 cubic feet) dust bin below. The remaining couple percent of dust is filtered in a chamber about 1,120 cubic inches which houses the cartridge filters. Then, air is relayed to blower. My question is, does the dirty side volume include the dust bin located below the centrifugal separator, the centrifugal tube, and the cartridge filter chamber or just the centrifugal tube and cartridge filter chamber. Thank you, Curt C.