Flagro FVNP-400 Indirect Fired Heater – 390,000 BTU High-Capacity Industrial Heating
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The Flagro FVNP-400 390,000 BTU Dual-Fuel Indirect-Fired Heater delivers temporary commercial heating for construction sites, warehouses, industrial facilities, and temporary structures. With propane/natural gas compatibility, a stainless steel heat exchanger, and 2,500 CFM airflow, it provides flexible heating for demanding applications.
Key Specifications:
- Heating: 390,000 BTU/hr
- Fuel: Propane or Natural Gas
- Airflow: 2,500 CFM
- Electrical: 115V / 15A Supply
- Propane Consumption: 18.5 lbs/hr
- Natural Gas Consumption: 380 CFH
- Air Outlets: Dual 12″ or Single 16″
- Ducting: Up to 50 Feet in Approved Configurations
- Weight: 450 lbs (Current Manufacturer Listing)
Features: Riello burner, 304 stainless steel heat exchanger, flat-free wheels, and optional remote thermostat.
Nationwide shipping available. Contact us for pricing and availability.
The Flagro FVNP-400 390,000 BTU Dual-Fuel Indirect-Fired Heater delivers high-capacity temporary heating for construction sites, warehouses, industrial facilities, and commercial buildings. Designed for demanding applications, this portable heater provides 390,000 BTU/hr of heating capacity and 2,500 CFM of airflow.
The FVNP-400 operates on propane or natural gas, providing flexibility for contractors and facility operators with different fuel supply requirements.
Featuring proven Riello burner technology and a fully welded 16-gauge 304 stainless steel heat exchanger, the heater separates combustion exhaust from the heated supply air during normal operation.
Its rugged commercial cabinet, two 16-inch flat-free wheels, and flexible heated-air outlet configurations make the FVNP-400 suitable for temporary heating installations where portability and reliable performance are essential.
With compatible supply ducting, thermostatic control capability, and standard 115V electrical operation, the Flagro FVNP-400 provides a dependable heating solution for commercial and industrial projects.
Key Features of the Flagro FVNP-400
- 390,000 BTU/hr Heating Capacity: High-output temporary heating for construction and industrial applications.
- Dual-Fuel Operation: Compatible with propane or natural gas.
- 2,500 CFM Airflow: Distributes heated air through approved commercial ducting.
- Indirect-Fired Heating: Separates normal combustion exhaust from the heated supply air.
- Riello Burner Technology: Commercial burner system designed for reliable heating performance.
- 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: Provides consistent heated-air circulation.
- Direct Spark Ignition: Supports automatic burner ignition.
- Dual 12-Inch Air Outlets: Provides two heated-air distribution connections.
- Alternative Single 16-Inch Outlet: Available for compatible ducting arrangements.
- Up to 50 Feet of Ducting: Supports approved extended heated-air installations.
- Smart Power Indicator: Helps verify proper electrical supply.
- Optional Remote Thermostat: Compatible with Flagro FV-THB thermostat controls.
- Flat-Free Wheels: Two 16-inch wheels for convenient jobsite mobility.
- cETLus Listed: Manufacturer-listed safety certification.
Dual-Fuel Heating: Propane or Natural Gas
One of the primary advantages of the Flagro FVNP-400 is its ability to operate on either propane or natural gas.
This allows contractors to select an appropriate fuel source based on site availability and project requirements.
Propane Operation
When operating on propane, the FVNP-400 provides up to 390,000 BTU/hr of heating capacity.
Published propane specifications:
- Fuel: Propane
- Heating Capacity: 390,000 BTU/hr
- Consumption: 18.5 lbs/hr
- Manifold Pressure: 1.5″ W.C.
The heater requires an appropriately sized propane supply and compatible gas connections.
Natural Gas Operation
The FVNP-400 can also operate on natural gas.
Published natural gas specifications:
- Fuel: Natural Gas
- Heating Capacity: 390,000 BTU/hr
- Consumption: 380 cubic feet per hour
- Manifold Pressure: 2.0″ W.C.
The natural gas supply must provide adequate pressure and flow to meet the manufacturer’s operating requirements.
Important: Fuel changes must follow Flagro’s approved procedures. The unit must be correctly configured and connected for the selected fuel before operation.
Indirect-Fired Heating Technology
The Flagro FVNP-400 uses an indirect-fired heating system to deliver warm air without intentionally introducing burner combustion products into the supplied airflow.
Unlike direct-fired heaters, which release combustion gases into the heated air, the FVNP-400 transfers heat through a separate stainless steel heat exchanger.
During normal operation, the heat exchanger separates burner exhaust from the air being delivered to the conditioned space.
Advantages of Indirect-Fired Heating
- Separates normal combustion exhaust from supplied heated air
- Avoids directly adding combustion moisture to the heated airflow
- Supports ducted temporary heating installations
- Provides high-capacity heat for commercial applications
- Offers flexible equipment placement in properly designed systems
Important: Combustion exhaust must still be safely vented, and the heater requires adequate combustion air, ventilation, and manufacturer-specified clearances.
Common Applications for the Flagro FVNP-400
Construction Site Heating
Commercial construction projects frequently require temporary heat during winter conditions, building renovations, and HVAC installation.
The FVNP-400 provides high-capacity heating for appropriately sized construction applications.
Typical uses include:
- Commercial building construction
- Winter construction projects
- Temporary construction enclosures
- Building renovations
- Heating during HVAC installation
- Maintenance and repair operations
Warehouses and Industrial Facilities
Warehouses, manufacturing facilities, and industrial buildings may require supplemental heating during HVAC outages, seasonal temperature changes, or equipment maintenance.
The FVNP-400 provides 390,000 BTU/hr of heating capacity with 2,500 CFM of airflow for suitable temporary heating systems.
Compatible ducting allows heated air to be directed toward work areas or distribution points.
Temporary Structures and Commercial Tents
The FVNP-400 can support properly designed temporary heating systems for commercial tents, construction shelters, and temporary structures.
Its indirect-fired heat exchanger keeps normal combustion exhaust separate from the heated supply air.
Heater positioning, exhaust routing, ventilation, fuel connections, and applicable fire-safety requirements must be evaluated before installation.
Emergency Commercial Heating
The Flagro FVNP-400 can also provide temporary heat during:
- Permanent HVAC failures
- Planned heating-system shutdowns
- Commercial renovations
- Industrial maintenance
- Winter construction operations
- Temporary facility installations
Explore Commercial Heating Applications
Flagro FVNP-400 Technical Specifications
| Specification | Flagro FVNP-400 |
|---|---|
| Model Number | FVNP-400 |
| Equipment Type | Dual-Fuel Indirect-Fired Heater |
| Heating Capacity | 390,000 BTU/hr |
| Fuel Type | Propane / Natural Gas |
| Propane Consumption | 18.5 lbs/hr |
| Natural Gas Consumption | 380 CFH |
| Propane Manifold Pressure | 1.5″ W.C. |
| Natural Gas Manifold Pressure | 2.0″ W.C. |
| Electrical Supply | 115V / 60Hz |
| Manufacturer-Listed Electrical Supply | 15 Amps |
| Operating Current | 10.5 Amps |
| Fan Motor | 3/4 HP |
| Airflow | 2,500 CFM |
| Burner | Riello |
| Ignition | Direct Spark |
| Heat Exchanger | 16-Gauge 304 Stainless Steel |
| Heated-Air Outlets | Two 12″ or One 16″ |
| Advertised Ducting Capability | Up to 50 Feet |
| Return-Air Connection | No |
| Integrated Fuel Tank | No — External Gas Supply Required |
| Remote Thermostat | Optional FV-THB |
| Smart Power Indicator | Yes |
| Wheels | Two 16″ Flat-Free |
| Length | 70″ |
| Width | 29″ |
| Height | 52″ |
| Weight | 450 lbs |
| Certification | cETLus |
Specifications are based on Flagro’s current FVNP-400 product listing. Historical manufacturer literature lists different dimensions and weight. Confirm specifications against the actual supplied unit before installation or arranging freight.
Electrical Requirements
The Flagro FVNP-400 operates on 115V electrical power.
The manufacturer lists:
- Power Supply: 115V / 15A
- Operating Current: 10.5 Amps
- Blower Motor: 3/4 HP
- Smart Power Indicator: Included
The heater requires properly grounded electrical service.
Confirm the plug, receptacle, circuit protection, and installation requirements against the manufacturer’s current operating manual and equipment nameplate.
Air Distribution and Ducting
The Flagro FVNP-400 delivers 2,500 CFM of heated airflow through compatible discharge outlets.
Standard Dual 12-Inch Outlets
The heater is available with two 12-inch heated-air outlets.
These allow warm air to be distributed through separate duct connections.
Alternative Single 16-Inch Outlet
Flagro also lists a single 16-inch heated-air outlet configuration.
Confirm the desired outlet arrangement before ordering.
Ducting Up to 50 Feet
The standard FVNP-400 supports approved heated-air ducting configurations up to approximately 50 feet.
This differs from the FVNP-400RC, which provides increased airflow, return-air recirculation, and longer advertised ducting capability.
Duct lengths must follow Flagro’s requirements for diameter, temperature rating, airflow resistance, and installation configuration.
Compatible Flagro Accessories
FV-HD12 — 12-Inch Heated-Air Duct
The FV-HD12 is a 12-inch-diameter, 12-foot-long duct compatible with approved 12-inch outlet configurations.
FV-HDG16 — 16-Inch Heated-Air Duct
The FV-HDG16 is a 16-inch-diameter, 25-foot-long duct designed for suitable 16-inch outlet configurations.
FV-THB — Remote Thermostat
The FV-THB is a manufacturer-listed remote thermostat accessory.
It allows the heater to be operated using a compatible remote temperature-control connection.
Contact Climate Control Solutions for pricing and accessory availability.
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External Fuel Supply Requirements
Unlike Flagro’s oil-fired FVO-400, the FVNP-400 does not include an onboard fuel tank.
The heater requires a suitable external propane or natural gas supply.
Published Fuel Consumption
| Fuel | Consumption |
|---|---|
| Propane | 18.5 lbs/hr |
| Natural Gas | 380 CFH |
The fuel supply must be properly sized to maintain the required operating pressure.
Actual consumption over time will depend on burner operation, thermostat demand, and the conditions of the installation.
All gas connections must comply with the manufacturer’s requirements and applicable fuel-gas regulations.
Portable Construction
The FVNP-400 features a durable commercial cabinet and two 16-inch high-density flat-free wheels.
These features help contractors transport and position the heater on suitable jobsite surfaces.
The current manufacturer product listing identifies dimensions of:
- Length: 70 inches
- Width: 29 inches
- Height: 52 inches
- Weight: 450 pounds
Appropriate lifting equipment and safe handling procedures should be used during transportation and installation.
Safety and Installation Requirements
The Flagro FVNP-400 is commercial gas-fired heating equipment intended for approved temporary heating applications.
Important safety considerations include:
- Provide adequate combustion air and ventilation.
- Safely route combustion exhaust away from occupied areas and air intakes.
- Maintain manufacturer-required clearances from combustible materials.
- Use only approved propane or natural gas connections.
- Follow the correct fuel configuration and connection procedures.
- Verify adequate gas supply pressure.
- Connect to properly grounded electrical service.
- Keep heated-air outlets unobstructed.
- Use only approved high-temperature ducting.
- Follow the manufacturer’s installation, operating, and servicing instructions.
Indirect-fired heating separates combustion exhaust from the supplied heated air during normal operation but does not eliminate the need for safe exhaust venting or adequate ventilation.
Why Choose the Flagro FVNP-400?
The Flagro FVNP-400 combines 390,000 BTU/hr heating capacity, propane/natural gas compatibility, 2,500 CFM airflow, and portable construction in one commercial indirect-fired heater.
Its Riello burner, stainless steel heat exchanger, and flexible heated-air outlets make it a practical option for construction projects and industrial temporary heating applications.
For customers requiring higher airflow and return-air recirculation, Flagro offers the FVNP-400RC.
Compare Other Flagro Indirect-Fired Heaters
Climate Control Solutions supplies additional commercial heating equipment:
- Flagro FVNP-400RC: 390,000 BTU dual-fuel indirect-fired heater with 4,000 CFM airflow and return-air recirculation.
- Flagro FVO-400: 390,000 BTU oil-fired indirect heater with a 42-gallon fuel tank.
- Flagro FVO-400RC: 390,000 BTU oil-fired indirect heater with recirculation and extended ducting.
- Flagro FVNP-750: 750,000 BTU dual-fuel indirect-fired heater for larger heating projects.
Explore Commercial Heating Solutions
Frequently Asked Questions About the Flagro FVNP-400
How much heat does the Flagro FVNP-400 produce?
The heater provides up to 390,000 BTU/hr of heating capacity.
Is the FVNP-400 dual-fuel?
Yes. The FVNP-400 can operate on propane or natural gas when properly configured.
How much propane does the FVNP-400 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 per hour.
Does the FVNP-400 have a built-in fuel tank?
No. It uses an external propane or natural gas supply.
How much airflow does the heater provide?
The FVNP-400 delivers 2,500 CFM using a 3/4 HP blower motor.
What electrical power is required?
The heater operates on 115V electrical service with a manufacturer-listed 15A supply and approximately 10.5A operating current.
What size ducting does the FVNP-400 use?
Flagro lists dual 12-inch or single 16-inch heated-air outlet configurations.
How much ducting can the heater support?
The standard FVNP-400 supports approved heated-air ducting configurations up to approximately 50 feet.
Does the FVNP-400 support return-air recirculation?
No. The standard FVNP-400 does not include a dedicated return-air inlet. The FVNP-400RC provides that feature.
Does the heater include a thermostat?
The FV-THB remote thermostat is a compatible optional accessory.
What is the difference between the FVNP-400 and FVNP-400RC?
Both provide 390,000 BTU/hr of heating and support propane or natural gas. The FVNP-400 provides 2,500 CFM, while the FVNP-400RC provides 4,000 CFM, return-air recirculation, and longer ducting capability.
Request a Quote for the Flagro FVNP-400
Climate Control Solutions supplies Flagro indirect-fired heaters, dual-fuel construction heaters, and commercial temporary heating equipment nationwide.
Whether you need one FVNP-400 for a construction project or multiple heaters for an industrial facility, our team can assist with equipment selection, fuel requirements, compatible ducting, and freight arrangements.
Contact Climate Control Solutions for current pricing and availability.
Phone: (800) 633-8711
Email: [email protected]
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