Rupp Air Modular Direct Gas Fired Make Up Air Unit, Heated, 5500 CFM with 20” Mixed Flow Direct Drive Fan - Natural Gas

Direct Gas-Fired Heated Make-Up Air Unit with 20" Mixed-Flow Direct Drive Fan

The Rupp Air R2D.500-20D is a direct gas-fired heated make-up air unit engineered to supply high-volume tempered air for commercial and industrial applications. Powered by a 5.0 HP 3-phase motor and a 20" direct drive mixed-flow fan, this unit delivers up to 5,500 CFM and 475,200 BTU/h of direct-fired natural gas heating. Constructed from heavy-gauge G90 galvanized steel, it is configured for down-discharge roof or pad installations requiring consistent outdoor air delivery.

Designed for straightforward VAV operation. The R2D.500-20D features factory-wired 0–150°F discharge temperature control with intake-based heating activation and a pre-mounted Lenze ESV series VFD (5 HP max) with dual Modbus ports. The package includes a sloped intake with 2" EZ Kleen aluminum mesh filters, motorized backdraft damper, factory-set freezestat protection, commercial smoke detector interlock, and a matching insulated flat roof curb for complete installation.

Rupp Air Features & Benefits

• 20" Mixed-Flow Direct Drive Fan: Driven by a 5.0 HP 3-phase motor (5,500 CFM @ 0.500" wc ESP) to provide reliable airflow without belt maintenance.
• Direct Gas-Fired Heating: Supplies 475,200 BTU/h of clean, near 100% efficient natural gas heat directly in the airstream with an 80°F temperature rise capability.
• Fuel Type Flexibility: Factory-configured for natural gas operation, with liquid propane options available to accommodate site-specific fuel requirements.
• Factory-Installed ESV VFD: Includes a pre-wired ESV402N02TXB571 VFD (5 HP max, 200/240V 3-Phase) with dual RJ-45 Modbus ports and an in-fan line reactor for VAV speed control.
• Discharge & Intake Temperature Control: Manages 0–150°F discharge temperature with automatic heating activation based on intake set points and a field-wired On/Off start command.
• Sloped Filtered Intake: Features a weather-resistant sloped intake hood equipped with washable 2" MV EZ Kleen metal mesh filters.
• Heavy-Duty Enclosure & Curb: Built with G90 galvanized steel construction and supplied with a matching CRB31X79X16INS insulated flat roof curb with fully welded/staked base corners.
• Comprehensive Safety Controls: Pre-wired with a motorized low-leakage backdraft damper (LF120S actuator), low fire start, commercial smoke detector interlock, and a factory-set freezestat (35°F / 10 min).

What's Included

Each Rupp Air R2D.500-20D package includes the direct gas-fired heated make-up air unit with a 20" mixed-flow direct drive fan, a sloped filtered intake with 2" MV EZ Kleen metal mesh filters, 0–150°F discharge temperature control, an ANSI-compliant gas manifold, down discharge construction, low fire start, motorized low-leakage backdraft damper with LF120S actuator, commercial smoke detector interlock, factory-set freezestat (35°F / 10 min), VAV wiring package, factory-mounted ESV series variable frequency drive with in-fan line reactor and Modbus RJ-45 ports, and an insulated flat roof curb with a full bottom curb corner.

Safety Features

• Redundant Gas Valves: Provides redundant gas shutoff for added safety.
• Timed Safety Lockout: Intermittent spark ignition with timed safety lockout helps protect against ignition failure.
• High-Temperature Limit: Monitors temperature to help protect the unit from excessive heat.
• Airflow Proving Switch: Verifies airflow for safe heater operation.
• Disconnect Switch: Provides a means to disconnect electrical power for service.
• Burner Observation Port: Provides access for visual burner inspection.

Warranty Information

RuppAir provides a 2-year limited warranty covering defects in materials and workmanship under normal use and service. The warranty period is 24 months from the date of shipment. Defective parts covered by the warranty will be repaired or replaced at no charge after examination by RuppAir.

The warranty does not apply if the equipment is not installed by a qualified installer according to the manufacturer's installation instructions, is not installed in accordance with applicable federal, state, and local codes, is misused or neglected, is operated outside its published capacity, or the invoice is not paid according to the sales agreement. The buyer is responsible for all labor costs associated with warranty repairs or replacements. For complete warranty details, terms, conditions, exclusions, and limitations, please refer to the RuppAir Warranty Policy.