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WB-12 is for a room of 275 Cubic feet
WB-15 is for a room of 400 Cubic feet
WB-18 is a room 8x8x8 or 500 Cubic feet
WB-21 is a room 8x12x8 or 768 Cubic feet
WB-24 is a room 10x12x8 or 960 Cubic feet
