Vent-Box Cabinet Filtration Unit Filter Type Carbon 250 cfm CFM Overall Height 16 in Overall Width 12 in Overall Length 21 in Inside Height 16 in Inside Length 12 in Inside Width 21 in Opening Size 1 1/2 in 0.4 hp HP Voltage 115V/60 Hz Number of Filters Required 1 Powder-Coated Steel Compliance UL 61010 Width 21 in Depth 12 in Height 16 in Voltage (AC) 115V