Designed for Emergency Shelters Works on standard 120V circuit! RAMFAN’s UB20 In-Line Heater system is a propane, indirect- fried portable heating system to provide safe, warm air into emergency shelters and confined spaces. The heater’s stainless steel heat-exchanger ensures the supplied air is not contaminated with fuel or exhaust from combustion. It is compatible with common propane tanks; a standard 20lb tank can provide up to 10 hours of continuous heating. Compatible with: UB20 Confined Space Ventilator (ED7002 or ED8002) Quick-Couple Duct Canister (ED7004CS or ED7004CL) Flexible Duct (FDT-0815BR or FDT-0825BR) Common Propane Cylinders (per ANSI/NFPA 58-1986) System includes: 1 ea BG12 - 12'' Duct Carrying Bag -(FDT-1225CBB, FDT-30534010BB ONLY) 1 ea ED7002 - 8'' 1/3HP Blower-Exhauster - 115V/240v 50/60 Hz Ships as 115V 1 ea FDT-081207BB - 8'' Neoprene Reinforced duct, 6ft (for heater/tent kits) 1 ea HA01 - 55,000 BTU Propane Heater - w/Thermostat - w/Regulator Pt# HA01REG