Flagro FVO-400RC Indirect Fired Oil Heater 390000 Btu/h

Product Description

The FLAGRO FVO-400RC is a 390,000 BTU/h indirect fired, forced-air oil heater equipped with a recirculating hood for efficient heat distribution across long duct runs. The unit draws combustion air and routes exhaust outside the conditioned space, making it suitable for occupied job sites where clean air is required. A 1 HP backward-incline blower delivers up to 4,000 CFM of heated air, and the welded 304 stainless steel heat exchanger in 16-gauge construction handles sustained high-output operation. Power requirements are 115 volts, 15 amps with an actual draw of 10.5 amps, compatible with standard single-phase temporary power. HVAC contractors and mechanical crews deploy this unit for temporary heat on construction projects, industrial shutdowns, and large-scale restoration work.

The FVO-400RC is designed for temporary heating applications in commercial construction, industrial facilities, tented event spaces, and remediation job sites. The recirculating hood allows heated air to be returned and redistributed, improving thermal efficiency in spaces with high ceilings or large open volumes. The unit supports flexible ducting configurations: two 12-inch diameter air outlets or one 16-inch diameter outlet, plus a 16-inch diameter air inlet for return ducting. Compatible outlet ducting includes FV-HD12 (12-inch by 12-foot) and FV-HDG16 (16-inch by 25-foot); return ducting uses FV-HDV16 (16-inch by 25-foot). Total ductable reach extends up to 150 feet, making it practical for complex temporary heat distribution layouts.

Key Features

• 390,000 BTU/h heating output from an indirect fired oil-fueled system with combustion exhaust vented outside the heated space
• Backward-incline blower delivers 4,000 CFM at reduced noise and lower amperage draw compared to forward-curved fan designs
• Welded 304 stainless steel heat exchanger, 16-gauge construction, built for rental-grade durability
• 42 US gallon onboard fuel tank provides approximately 14 to 16 hours of continuous runtime per fill
• Recirculating hood configuration supports return-air ducting for improved heat recovery in large or open spaces
• Two 16-inch diameter flat-free wheels for site mobility without risk of flats during transport

Compatibility

The FVO-400RC accepts compatible Flagro ducting accessories including FV-HD12 (12-inch by 12-foot outlet duct), FV-HDG16 (16-inch by 25-foot outlet duct), and FV-HDV16 (16-inch by 25-foot return duct). It is designed as a direct model in the Flagro FVO-400 series alongside related configurations FVO-400RCBT, FVO-750, and FVO-1100TR.

Installation Notes

This unit is installed and serviced by licensed HVAC technicians or qualified mechanical contractors experienced with temporary heating equipment. Before connecting or disconnecting ducting, shut down the heater and allow the heat exchanger to cool completely. Ensure combustion exhaust is routed to an unoccupied exterior zone per applicable codes — exhaust gases must never enter the conditioned space. Temporary power connections must meet NEC requirements for the 115-volt, 15-amp circuit; verify the site supply can sustain the startup load before energizing the unit.

Technical Specifications

• Heating Capacity: 390,000 BTU/h
• Airflow: 4,000 CFM
• Power Supply: 115 volts, 1-phase, 60 Hz
• Current Consumption: 15 amps circuit / 10.5 amps actual draw
• Fuel Tank Capacity: 42 US gallons
• Approximate Runtime per Tank: 14 to 16 hours
• Air Outlet: 2 x 12-inch diameter or 1 x 16-inch diameter
• Air Inlet: 1 x 16-inch diameter
• Heat Exchanger Material: 16-gauge 304 stainless steel, fully welded
• Wheels: 2 x 16-inch diameter flat-free
• Dimensions: 70 inches L x 29 inches W x 54 inches H
• Weight: 450 pounds
• Firing Type: Indirect fired (clean air output)

Standard Information

• Brand: FLAGRO
• Manufacturer Part Number: FVO-400RC