Flagro FVO-400T – 390,000 BTU Indirect Fired Heater
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The Flagro FVO-400T 390,000 BTU Indirect-Fired Heater is listed for temporary commercial heating applications, including construction sites, warehouses, and industrial facilities.
Published FVO-400 Platform Specifications:
- Heating: 390,000 BTU/hr
- Fuel: Diesel, Fuel Oil or Kerosene
- Airflow: 2,500 CFM
- Fuel Tank: 42 Gallons
- Electrical: 115V / 15A Supply
- Heat Exchanger: 16-Gauge 304 Stainless Steel
- Outlets: Dual 12″ or Single 16″
- Ducting: Up to 50 Feet
- Weight: 450 lbs
Specifications are for the verified FVO-400 platform; confirm the FVO-400T configuration before ordering.
Nationwide shipping available. Contact us for pricing and availability.
The Flagro FVO-400T 390,000 BTU Indirect-Fired Heater is designed to provide dependable temporary heating for construction sites, warehouses, industrial facilities, and commercial structures. With 390,000 BTU/hr of heating capacity and 2,500 CFM of airflow, this portable oil-fired heater offers substantial heating performance for demanding temporary applications.
The heater uses a fully welded 16-gauge 304 stainless steel heat exchanger to separate combustion exhaust from the heated supply air during normal operation. This indirect-fired design makes it suitable for properly engineered applications where direct-fired combustion products are undesirable.
The FVO-400 platform features a 42-gallon onboard fuel tank, Riello burner technology, portable construction, and flexible heated-air distribution through compatible ducting.
For contractors and facility managers requiring temporary heat during cold weather, HVAC maintenance, or building renovations, the Flagro FVO-400 series provides a reliable commercial heating solution.
Key Features
- 390,000 BTU/hr Heating Capacity: High-output temporary heating for commercial and industrial applications.
- 2,500 CFM Airflow: Delivers heated air through compatible distribution ducting.
- Indirect-Fired Heating: Keeps normal burner combustion exhaust separate from the heated supply air.
- 42-Gallon Fuel Tank: Integrated onboard fuel storage for extended operation.
- Riello Burner Technology: Designed for dependable oil-fired heating, including cold-weather operation.
- 304 Stainless Steel Heat Exchanger: Fully welded, 16-gauge construction.
- 115V Electrical Operation: Manufacturer-listed 15A supply with approximately 10.5A operating current.
- 3/4 HP Blower Motor: Supports commercial heated-air circulation.
- Dual 12-Inch Air Outlets: Standard air-distribution configuration.
- Optional Single 16-Inch Outlet: Alternative configuration for compatible ducting installations.
- Up to 50 Feet of Ducting: Supports approved heated-air duct arrangements.
- Portable Construction: Flat-free wheels help simplify transportation around suitable jobsites.
- Optional Remote Thermostat: Compatible with the manufacturer-listed FV-THB thermostat.
- cETLus Listed: Manufacturer-listed certification for the FVO-400 platform.
Indirect-Fired Heating Technology
The Flagro FVO-400 heater platform uses an indirect-fired heating system to transfer heat into a separate supply-air stream.
Unlike direct-fired heaters that intentionally introduce combustion products into the heated airflow, indirect-fired heaters use a heat exchanger to separate the two air streams.
The fully welded 304 stainless steel heat exchanger helps deliver heated air without directly adding combustion exhaust or combustion moisture.
This arrangement is useful for temporary commercial heating installations that require controlled distribution of heated air.
Important: The heater still requires proper combustion-air supply, flue exhaust routing, ventilation, and manufacturer-specified clearances.
Common Applications
Construction Site Heating
The FVO-400 platform provides temporary heating for appropriately sized commercial construction projects.
Common applications include:
- Winter construction operations
- Commercial building renovations
- Temporary construction enclosures
- Building maintenance projects
- Heating during HVAC installation
- Temporary work areas
Warehouses and Industrial Facilities
Warehouses, manufacturing facilities, and industrial buildings may require supplemental heating during equipment maintenance, seasonal demand, or permanent HVAC outages.
With 390,000 BTU/hr of heating capacity, the heater can support suitable temporary heating arrangements.
Temporary Structures and Commercial Tents
Indirect-fired heating can support appropriately designed temporary structures and commercial tents.
The supplied warm air is separated from normal burner exhaust through the heat exchanger.
Heater placement, exhaust discharge, ventilation, and applicable occupancy and fire-safety requirements must be evaluated before installation.
Emergency Commercial Heating
The heater can provide temporary heat during commercial HVAC failures, planned maintenance shutdowns, renovations, and other appropriately designed emergency heating applications.
Explore Commercial Heating Applications
Technical Specifications
The following specifications are published for Flagro’s standard FVO-400 platform. Confirm their applicability to equipment labeled FVO-400T.
| Specification | Published FVO-400 Platform |
|---|---|
| Heating Capacity | 390,000 BTU/hr |
| Heating Type | Oil-Fired Indirect |
| Fuel | No. 1 / No. 2 Fuel Oil, Diesel or Kerosene |
| Airflow | 2,500 CFM |
| Fuel Tank | 42 US Gallons |
| Fuel Consumption | Approximately 2.75 GPH |
| Published Runtime | Approximately 14 Hours |
| Electrical Supply | 115V / 15A |
| Operating Current | 10.5 Amps |
| Fan Motor | 3/4 HP |
| Burner | Riello |
| Ignition | Direct Spark |
| Heat Exchanger | 16-Gauge 304 Stainless Steel |
| Standard Air Outlets | Two 12″ |
| Alternative Air Outlet | One 16″ |
| Ducting Capability | Up to 50 Feet |
| Remote Thermostat | Optional FV-THB |
| Wheels | Two 16″ Flat-Free |
| Length | 70″ |
| Width | 29″ |
| Height | 52″ |
| Weight | 450 lbs |
| Certification | cETLus |
Fuel Tank and Runtime
The standard FVO-400 configuration includes a 42-gallon integrated fuel tank.
Flagro publishes approximately 14 hours of operating time, with fuel consumption around 2.75 gallons per hour at rated operation.
Actual runtime depends on fuel availability, burner configuration, and operating conditions.
The unit is designed for manufacturer-approved oil-based fuels, including suitable fuel oil, diesel, and kerosene.
Electrical Requirements
The standard FVO-400 operates on 115V electrical power.
Its published electrical specifications include:
- Power Supply: 115V
- Listed Circuit Supply: 15 Amps
- Operating Current: 10.5 Amps
- Blower Motor: 3/4 HP
The heater requires a properly grounded electrical connection.
Confirm the actual equipment nameplate, wiring, and overcurrent protection before installation.
Air Distribution and Ducting
The heater delivers approximately 2,500 CFM of airflow through compatible heated-air outlets.
The standard FVO-400 configuration includes dual 12-inch outlets, with an alternative single 16-inch connection.
Flagro publishes ducting capability of up to 50 feet for approved installations.
Duct diameter, material, temperature rating, and permissible length must comply with the manufacturer’s operating instructions.
Compatible Accessories
FV-HD12 — 12-Inch × 12-Foot Heated-Air Duct
Designed for compatible 12-inch outlet configurations.
FV-HDG16 — 16-Inch × 25-Foot Heated-Air Duct
Compatible with approved 16-inch outlet configurations.
FV-THB — Optional Remote Thermostat
Provides remote temperature control when connected to compatible Flagro equipment.
Browse Commercial HVAC Accessories
Portable Commercial Construction
The standard FVO-400 platform features a rugged cabinet, integrated fuel tank, and two high-density flat-free wheels.
Its compact dimensions make it practical for temporary heating projects where equipment needs to be transported or repositioned.
For the standard FVO-400, Flagro publishes dimensions of 70″ L × 29″ W × 52″ H and a weight of 450 pounds.
Verify the dimensions, weight, and mounting arrangement of any FVO-400T configuration before shipping.
Safety and Installation Requirements
Commercial indirect-fired heaters must be installed according to the manufacturer’s instructions.
Important considerations include:
- Provide adequate combustion air and ventilation.
- Route combustion exhaust safely away from occupied areas.
- Maintain required clearances from combustible materials.
- Use only approved fuel types.
- Inspect burner and fuel connections.
- Confirm proper electrical service.
- Use manufacturer-approved ducting.
- Avoid restricting supply-air outlets.
- Position the heater on a stable surface.
- Follow applicable fire, mechanical, and fuel-storage regulations.
Indirect-fired heating separates normal combustion exhaust from the heated supply air, but proper exhaust management remains essential.
Frequently Asked Questions
How much heating capacity does the Flagro FVO-400T provide?
The listed product is described as providing 390,000 BTU/hr. This matches Flagro’s published FVO-400 platform, but the specific FVO-400T designation should be confirmed.
What fuel does the heater use?
The standard FVO-400 uses manufacturer-approved fuel oil, diesel, or kerosene.
Does it operate on propane or natural gas?
The verified FVO-400 platform does not. Flagro offers separate FVNP models for propane and natural gas operation.
How much airflow does the heater provide?
Flagro specifies 2,500 CFM for its standard FVO-400 heater.
What electrical supply is required?
The standard FVO-400 operates on 115V power with a manufacturer-listed 15A supply.
Does the heater include a fuel tank?
The standard FVO-400 includes a 42-gallon onboard fuel tank. Confirm whether the FVO-400T has the same configuration.
What size ducting does the heater use?
The published FVO-400 configurations include dual 12-inch or single 16-inch heated-air outlets.
Does this heater have return-air recirculation?
The standard FVO-400 does not. Flagro’s FVO-400RC is the recirculating alternative.
Is a remote thermostat available?
Flagro lists the FV-THB remote thermostat for its standard FVO-400 platform.
Is the FVO-400T different from the FVO-400?
The manufacturer’s current published information identifies the FVO-400, but I could not independently verify the separate FVO-400T designation. Confirm the model before ordering.
Request a Quote for the Flagro FVO-400T
Climate Control Solutions supplies Flagro indirect-fired heaters, oil-fired construction heaters, and commercial temporary heating equipment nationwide.
Our team can assist with equipment selection, fuel requirements, compatible ducting, and freight coordination.
Contact Climate Control Solutions for current pricing, model confirmation, and availability.
Phone: (800) 633-8711
Email: [email protected]
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