Reznor's RP duct furnaces are built with a weatherized cabinet and control compartment. Each model is completely pre-packaged, factory wired, and fire tested. Units are designed for use with standard air handling systems in air conditioning, heating or makeup air applications.
Can be installed upstream or downstream from cooling coils.

Easy field conversion is possible for lower temperature rise, higher airflow applications. Check the Installation Manual with unit to determine if your application requires this. To convert the funace for higher airflow, remove air baffles per installation instruction manual.

  • Natural gas or propane fuel
  • Easy access to controls and wiring connections
  • Constructed of high quality materials
  • 4:1 or 2:1 turndown
  • 1 to 2 stages
  • Standard 110 volt power, optional 208/230/460 volt power
  • Up to 90°F temperature rise

Heating Range ( MBH )

Airflow Range ( CFM )

Heating Efficiency ( Gross )


  • Orifices for natural gas
  • Aluminized steel heat exchanger (when inlet air temperature is below 40F or temperature rise is less than 40F, optional stainless steel heat exchanger is recommended)
  • Aluminized steel burners with stainless steel insert
  • 120-volt supply voltage
  • 24-volt control voltage transformer
  • Redundant, single-stage combination gas valve
  • Spark-ignited, intermittent safety pilot with electronic flame supervision
  • High limit safety cutout
  • Power venter
  • Differential air pressure switch to verify vent flow
  • Terminal block wiring
  • Fan Control
  • Left side access for burners and controls (slide out burner drawer)
  • Weatherized steel cabinet with interlocking joints for outdoor mounting

Optional Features - Factory Installed

  • Orifices for propane gas
  • Elevations from 2,001 to 9,000 ft.
  • 409 or 321 stainless steel heat exchanger
  • 409 stainless steel burners
  • 409 stainless steel bottom pan
  • Burner Controls for Recirculated Heating
    • Two-stage gas valve
    • Electronic modulation
  • Gas Controls for Make up Air
    • Two-stage gas valve with ductstat
    • Mechanical modulation (50-100F)
    • Mechanical modulation (50-100F) with bypass
    • Electronic modulation - 50%-100% firing rate with duct probe (50-90F)
    • Electronic modulation - 50%-100% firing rate with duct probe with remote adjustment
    • Electronic modulation - 20/28%-100% firing rate not available on size 350
  • Intermittent spark pilot with timed lockout
  • Voltage - 208/230/460
  • Right side controls (facing airstream)
  • Manifold arrangement to comply with Illinois school code requirements
  • High and low pressure gas switches

Optional Features - Field Installed

  • Vertical vent terminal
  • One-stage thermostat
  • Two-stage thermostat
  • Electronic modulating room override thermostat
  • Thermostat guard with locking cover
  • Manual gas shut-off valve and union
  • Disconnect switch (UL listed)

2 Files


Duct Heater Marketing Catalog
Duct Heater Marketing Catalog
Download File
858.0 kB
Heating, Cooling, Ventilation & VRF Product Line
Heating, Cooling, Ventilation & VRF Product Line Sheet
Download File
630.7 kB

Technical Data
1 File

Technical Data

Catalog - Duct Heater
Duct heater catalog
Download File
1.6 MB

19 Files


Unit Installation Manual - Outdoor Duct Furnaces
Installation manual for Models RP & HRPD
Download File
1.3 MB
Parts Manuals - RP-RPBL-RPB-HRPD-RBL
Parts manual for Models RP, HRPD, RPB, RPBL, & RBL
Download File
2.3 MB
Field Service - Replacement Venter Motor and Mounting Plate
Instructions for assembling replacement venter motor and motor mounting plate for Models RP, RPB, RPBL, SC, & SSCBL
Download File
361.6 kB
Field Service - Replacement Gear Motor Kit
Instructions for installing replacement gear motor kit for Models SC, SSCBL, HRPD, RP, RPB & RPBL
Download File
755.5 kB
Parts Manuals - Functional Replacement Fan/Blower Controls and Limit Controls
 Parts manual for functional replacement fan/blower controls and limit controls
Download File
322.8 kB
Parts Manuals - Pilots - Parts manual
Functional replacement pilots
Download File
394.4 kB
Parts Manuals - Replacement Ignition System and Gas Valves
Replacement ignition system and gas valves by serial number code and Maxitrol system components by serial number suffix
Download File
1.3 MB
Field Service - Replacement Relay Kit - PN 259521
Replacement relay kit for Reznor part number 259521 - applies to power vented units using Reznor part number 46233 or 259518 time delay relay
Download File
646.2 kB
Field Service - Replacement Pressure Switch Kit - RP Series
Replacement pressure switch kit for Models RP, RPB, and RPBL (NOTE: applies to units built before December 1991)
Download File
227.0 kB
Field Service - Ignition Control Replacement - Various Models
Ignition control replacement kit for pilot code 62, 63, 65, 66, & 84 (found in first set of digitis of serial number)
Download File
250.4 kB
Option - Installation - Replacement for Discontinued Fan Control
Replacement kit for discontinued fan control, applies to duct furnaces and air handling systems with a Thermocore® heat exchanger
Download File
368.5 kB
Option - Installation - Valve Kit - W9
Replacement kit for propane valve with serial number code W9
Download File
137.2 kB
Field Service - Replacement Pressure Switch Kits
Replacement pressure switch kits for Models ADF, ADFH, RDF, SC, SSCBL,  and to Models RP, RPB, & RPBL manufactured in 1991 or later
Download File
374.7 kB
Field Service - Replacment Relay Kit - PN 262375
Replacement relay kit for Reznor part number 262375, applies to all power vented units using Reznor part number 206146 time delay relay
Download File
1.2 MB
Option - Installation - Valve Kit - M8, U8, U9
Replacement kit for propane valve with serial number code M8, U8, or U9
Download File
127.1 kB
Option - Installation - Replacement Venter Post Purge Control
Replacement kit for discontinued venter post purge control - applies to Reznor power vented/separated combustion furnaces and air handlers manufactured before 1987
Download File
221.3 kB
Field Service - Repl Kits for Amplifier in Electronic Modulation
Replacement kits for Maxitrol Amplifier Options AG7, AG8, AG9
Download File
293.8 kB
Field Service - Replacement of Discontinued Relays
Installation for kits designed to replace relays no longer available from suppliers. Applies to all Reznor units using obsolete relays.
Download File
340.4 kB
Unit Installation Manual - Chauffe-conduits - Instructions D'Installation
Installation / Fonctionnement / Entretien Application: chauffe-conduits extérieursséries RP et HRPD
Download File
1.2 MB

Other Files
1 File

Other Files

Warranty Statement
Reznor equipment limited warranty statement
Download File
183.4 kB