Flagro F-400T
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The Flagro F-400T 400,000 BTU Dual-Fuel Direct-Fired Heater provides high-output temporary heat for commercial construction sites, building renovations, and properly ventilated work areas. Its propane/natural gas compatibility, electronic ignition, built-in thermostat, and portable design make it a versatile construction heating solution.
Key Specifications:
- Heating Capacity: 400,000 BTU/hr
- Fuel: Propane or Natural Gas
- Airflow: 2,000 CFM
- Electrical: 115V / 15A
- Propane Consumption: 18.5 lbs/hr
- Natural Gas Consumption: 380 CFH
- Thermostat: Included
- Ignition: Electronic Direct Spark
- Air Outlet: 15″
- Weight: 90 lbs
Features: Fuel selector valve, flame safeguard system, 1/3 HP blower, and WK-400 wheel kit.
Nationwide shipping available. Contact Climate Control Solutions for pricing and availability.
The Flagro F-400T 400,000 BTU Dual-Fuel Direct-Fired Construction Heater delivers powerful temporary heating for commercial construction sites, building renovations, industrial maintenance projects, and properly ventilated work areas. Designed for demanding jobsite conditions, the F-400T combines 400,000 BTU/hr of heating capacity with 2,000 CFM of forced airflow.
The F-400T operates on propane or natural gas, offering flexibility for construction projects with different fuel supply arrangements. Its fuel selector valve allows the heater to be configured for the available gas source according to the manufacturer’s instructions.
Featuring electronic direct spark ignition, built-in thermostatic control, and a 100% flame safeguard system, the heater provides convenient operation and essential burner safety protection.
The F-400T also features a 1/3 HP blower motor, a 15-inch air outlet, and a compact steel frame designed for commercial construction heating.
With its high heating capacity, dual-fuel compatibility, and portable design, the Flagro F-400T is a practical solution for temporary heating during construction, alterations, repairs, and approved emergency applications.
Key Features of the Flagro F-400T
- 400,000 BTU/hr Heating Capacity: Provides high-output temporary heat for commercial construction applications.
- Dual-Fuel Operation: Compatible with propane or natural gas.
- 2,000 CFM Airflow: Distributes heated air through a powered forced-air system.
- 1/3 HP Blower Motor: Supports continuous airflow during operation.
- Electronic Direct Spark Ignition: Provides automatic burner ignition without manual lighting.
- Built-In Thermostat: Controls burner operation according to temperature demand.
- 100% Flame Safeguard: Monitors flame presence and interrupts fuel delivery if flame is not established or maintained.
- Fuel Selector Valve: Allows the correct propane or natural gas configuration to be selected.
- 115V Electrical Operation: Requires a compatible grounded 15A supply.
- 15-Inch Air Outlet: Provides high-volume warm-air discharge.
- Wheel Kit: WK-400 wheel kit for convenient movement on suitable jobsite surfaces.
- Portable Construction: Compact design for transportation and temporary heating applications.
- Commercial-Grade Design: Built for construction and maintenance environments.
- cULus Listed: Manufacturer-listed equipment certification.
400,000 BTU Dual-Fuel Heating
The Flagro F-400T is designed to operate on either propane or natural gas.
This flexibility allows contractors to use a compatible fuel source based on jobsite availability.
Propane Operation
The F-400T delivers 400,000 BTU/hr when properly configured for propane.
Published propane specifications:
- Heating Input: 400,000 BTU/hr
- Fuel Consumption: 18.5 lbs/hr
- Required Inlet Pressure: 11–14″ W.C.
Propane supply equipment must be appropriately sized to provide the necessary vaporization capacity, pressure, and fuel volume.
Cold-weather operation may require additional propane storage or an approved manifold configuration.
Natural Gas Operation
The heater can also operate on natural gas.
Published natural gas specifications:
- Heating Input: 400,000 BTU/hr
- Fuel Consumption: 380 cubic feet per hour
- Required Inlet Pressure: 3.5–14″ W.C.
Natural gas piping must be sized to provide the required flow and operating pressure.
Fuel Selector Valve
The F-400T includes a selector valve for propane or natural gas operation.
The valve must be positioned correctly before starting the heater.
Gas connections, pressure settings, and fuel changes must follow the manufacturer’s instructions and applicable fuel-gas regulations.
Direct-Fired Forced-Air Heating
The F-400T uses direct-fired heating technology.
Its gas burner heats the air that is distributed by the 1/3 HP blower motor.
Unlike indirect-fired heaters, the F-400T does not use a separate heat exchanger to isolate combustion products from the delivered airflow.
This design provides powerful temporary heating, but combustion gases and combustion moisture enter the surrounding air.
For this reason, the F-400T must be operated only in approved locations with sufficient fresh-air ventilation.
Built-In Thermostatic Control
The Flagro F-400T includes a thermostat for convenient temperature regulation.
The thermostat operates the heating system according to the selected setting and the temperature demand.
This allows the heater to cycle as needed rather than requiring continuous manual operation.
Actual fuel consumption over time depends on heating demand, ambient temperature, ventilation, and operating conditions.
Electronic Ignition and Flame Safety
The F-400T features an electronic direct spark ignition system.
When the controls call for heat, the ignition system initiates burner operation.
The heater also includes a 100% flame safeguard system.
This safety system monitors flame establishment and operation, interrupting fuel delivery if the required flame signal is not present.
Additional safety components include temperature-limit and airflow-proving controls.
All safety devices must remain operational and must never be bypassed.
Common Applications for the Flagro F-400T
Commercial Construction Heating
The F-400T is designed primarily for temporary heating during construction, alteration, repair, and approved emergency work.
Common applications include:
- Commercial building construction
- Winter construction projects
- Building renovations
- Temporary construction work areas
- Industrial construction projects
- Maintenance and repair operations
Industrial Maintenance Projects
The F-400T can provide temporary heat for suitable industrial maintenance and construction activities where direct-fired heaters are permitted.
Its dual-fuel design provides flexibility for different fuel supply arrangements.
Temporary Construction Enclosures
The heater may be used in appropriately ventilated construction enclosures where the installation meets Flagro’s requirements and applicable regulations.
Because combustion products enter the heated air, direct-fired heating must not be used in sealed or inadequately ventilated spaces.
Emergency Construction Heating
The F-400T can also support temporary heating during approved building repairs, alterations, and emergency construction activities.
Explore Commercial Heating Applications
Flagro F-400T Technical Specifications
| Specification | Flagro F-400T |
|---|---|
| Model Number | F-400T |
| Heater Type | Dual-Fuel Direct-Fired Construction Heater |
| Heating Capacity | 400,000 BTU/hr |
| Fuel | Propane or Natural Gas |
| Propane Consumption | 18.5 lbs/hr |
| Natural Gas Consumption | 380 CFH |
| Propane Inlet Pressure | 11–14″ W.C. |
| Natural Gas Inlet Pressure | 3.5–14″ W.C. |
| Electrical Supply | 115V / 60Hz / Single Phase |
| Electrical Requirement | 15A |
| Fan Motor | 1/3 HP |
| Airflow | 2,000 CFM |
| Ignition | Electronic Direct Spark |
| Thermostat | Included |
| Flame Safeguard | Yes |
| Fuel Selector Valve | Yes |
| Air Outlet Diameter | 15″ |
| Wheel Kit | WK-400 |
| Length | 48″ |
| Width | 22″ |
| Height | 24″ |
| Equipment Weight | 90 lbs |
| Certification | cULus Listed |
Specifications reflect Flagro’s published F-400T product information. Verify the current equipment nameplate, included accessories, and shipping specifications before ordering.
Electrical Requirements
The F-400T requires a 115V / 60Hz single-phase electrical supply rated for 15 amps.
The electrical connection powers the blower motor, electronic ignition, and operating controls.
Electrical Specifications
- Voltage: 115V
- Frequency: 60Hz
- Phase: Single Phase
- Electrical Supply: 15A
- Blower Motor: 1/3 HP
The heater must be connected to a properly grounded receptacle.
Any extension cord must meet the manufacturer’s electrical requirements.
Fuel Connections and Accessories
The Flagro F-400T requires an appropriately sized propane or natural gas supply.
Flagro lists several compatible accessories for gas connections and equipment mobility.
B42R0.75 — Second-Stage Regulator
The B42R0.75 is a manufacturer-listed 3/4-inch second-stage gas regulator for compatible installations.
S52180-12 — Gas Hose Assembly
The S52180-12 is a manufacturer-listed hose assembly with the following specifications:
- 3/4-inch inside diameter
- 15-foot length
- Compatible male-pipe connections
260SDOPCO — Ventless Regulator Option
Flagro also identifies the 260SDOPCO regulator option for compatible fuel installations.
WK-400 — Wheel Kit
The WK-400 wheel kit provides convenient mobility for the F-400T.
The manufacturer’s product description identifies the heater as supplied with a wheel kit, while the accessory catalogue lists WK-400 separately. Package contents should be confirmed when ordering.
Gas hoses and regulators must be properly selected for the fuel source, available supply pressure, and applicable codes.
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Compact Commercial Construction
The Flagro F-400T is designed for convenient transportation and temporary jobsite deployment.
Its published dimensions are:
- Length: 48 inches
- Width: 22 inches
- Height: 24 inches
- Equipment Weight: 90 pounds
Its compact frame and compatible wheel kit help simplify movement between suitable work areas.
The heater must be transported and operated in accordance with the manufacturer’s instructions.
Safety and Ventilation Requirements
The Flagro F-400T is an unvented direct-fired construction heater.
Because combustion products enter the heated airflow, adequate ventilation is essential.
Fresh-Air Ventilation
The manufacturer’s operating manual requires at least 1 square inch of fresh-air opening per 1,000 BTU/hr of heating input.
For the F-400T, this corresponds to at least 400 square inches of fresh-air opening, subject to all additional manufacturer and local-code requirements.
Minimum Clearances to Combustibles
| Location | Minimum Clearance |
|---|---|
| Above Heater | 5 Feet |
| Front | 8 Feet |
| Sides | 2 Feet |
| Rear | 1 Foot |
Propane Cylinder Safety
Flagro specifies that:
- The heater must be positioned at least 10 feet from propane cylinders.
- Heated airflow must not be directed toward a propane cylinder within 20 feet.
- Where cylinders are used, each must have at least a 100-pound capacity and be suitable for vapor withdrawal.
Additional Operating Requirements
- Use only in manufacturer-approved temporary construction applications.
- Provide adequate fresh-air ventilation.
- Do not use in homes or recreational vehicles.
- Protect the heater from rain, water spray, and dripping water.
- Inspect gas connections for leaks.
- Use appropriately sized fuel hoses and regulators.
- Maintain all required clearances from combustible materials.
- Keep air intakes and discharge openings unobstructed.
- Connect to a properly grounded electrical supply.
- Never bypass flame-safety or over-temperature controls.
- Follow applicable fire, building, electrical, and fuel-gas regulations.
The F-400T is not intended for unrestricted heating of occupied commercial spaces.
Why Choose the Flagro F-400T?
The Flagro F-400T combines 400,000 BTU/hr of heating capacity, dual-fuel operation, 2,000 CFM airflow, and integrated thermostatic control in a portable construction heater.
Its electronic ignition, flame safeguard system, and commercial-grade construction make it a practical solution for demanding temporary heating applications.
For contractors requiring additional heating capacity, Flagro also offers larger dual-fuel construction heaters.
Compare Other Flagro Direct-Fired Heaters
Climate Control Solutions supplies additional Flagro equipment:
- Flagro F-375: Adjustable 220,000–375,000 BTU propane construction heater requiring no electricity in its standard configuration.
- Flagro F-400T: 400,000 BTU dual-fuel construction heater with powered airflow and thermostat.
- Flagro F-1000T: 1,000,000 BTU dual-fuel construction heater with 7,000 CFM airflow.
- Flagro THC-355CDF: 330,000 BTU ductable dual-fuel direct-fired heater.
Explore Commercial Heating Solutions
Frequently Asked Questions About the Flagro F-400T
How much heat does the Flagro F-400T produce?
The heater delivers 400,000 BTU/hr of heating input.
Is the F-400T dual-fuel?
Yes. It operates on propane or natural gas when correctly configured.
How much propane does the F-400T consume?
Flagro lists approximately 18.5 pounds of propane per hour at rated operation.
How much natural gas does it consume?
The manufacturer lists approximately 380 cubic feet of natural gas per hour.
How much airflow does the F-400T provide?
The heater delivers 2,000 CFM through a 1/3 HP blower motor.
Does the F-400T require electricity?
Yes. It requires 115V single-phase power with a manufacturer-listed 15A supply.
Does it include a thermostat?
Yes. The F-400T includes thermostatic temperature control.
What ignition system does it use?
The heater features electronic direct spark ignition.
Does the heater have flame safety protection?
Yes. It includes a 100% flame safeguard system.
Does the F-400T include wheels?
Flagro advertises the model with a wheel kit and identifies the WK-400 as the compatible accessory. Confirm inclusion with the supplied package.
Does the heater include a gas hose and regulator?
Flagro lists compatible hoses and regulators as installation accessories. Inclusion should be confirmed with the specific order.
How much does the Flagro F-400T weigh?
Flagro lists approximately 90 pounds of equipment weight.
Can the F-400T be used inside a construction building?
Only in approved construction applications with the required fresh-air ventilation, fuel connections, combustible clearances, and other safety measures.
Can the heater run on diesel or fuel oil?
No. The F-400T operates on propane or natural gas only.
Request a Quote for the Flagro F-400T
Climate Control Solutions supplies Flagro direct-fired construction heaters, dual-fuel heating equipment, and commercial temporary heating solutions nationwide.
For single-unit orders or larger commercial heating projects, Climate Control Solutions can assist with equipment selection, compatible gas accessories, and freight arrangements.
Contact Climate Control Solutions for current pricing and availability.
Phone: (800) 633-8711
Email: [email protected]
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