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Indoor Gravity-Vented

Indoor Gravity-Vented

The indoor gravity-vented duct furnace line was designed for use with a building’s heating, heating/cooling, and make-up air systems. Available in 11 model sizes, the units cover a wide variety of applications. They have input ranges from 75,000 to 400,000 Btu/Hr and can operate on either natural or propane gas with an airflow range from 556 to 14,500 CFM.  The unit relies on a natural draft to vent properly. Power vented units should be considered if the vent system is horizontal or if the space in which the unit is located is generally under negative pressure.

  • ETL certification for commercial and industrial use in the US and Canada
  • Aluminized steel cabinet with duct flanges for easy ductwork connection
  • 81% minimum thermal efficiency over 20° to 100°F temperature rise range for fuel savings
  • Patented aluminized steel dimple tube clam-shell heat exchanger for maximum heat transfer (409 stainless steel optional)
  • Heat exchanger certified to withstand 3.0” W.C. external static for use in systems with long duct runs or high static accessories
  • Aluminized steel burner with stainless steel separator strip (409 stainless steel optional)
  • Certified for location either upstream or downstream from cooling coils and has an aluminized steel (409 stainless steel optional) drain pan that allows connection to a condensate drain line
  • Gravity vented with 45° angled round vent connection for tighter ducting
  • Blocked vent safety switch to verify proper venting
  • Right hand control access (left hand optional) with slide out burner access
  • Single stage gas controls (two stage, electronic modulation, or building management controls using a 0-10 Vdc or 4-20 mA input optional)
  • Automatic reset high limit safety control (manual reset optional)
  • Intermittent pilot ignition with continuous retry control system
  • Control terminal board and low voltage terminal connections
  • Gas control step down transformer with 24V gas controls
  • 4-point mounting with threaded rod (by others)
  • Multiple furnace electronic amplifier for controlling up to 4 duct furnaces with one discharge air sensor
  • Step down transformers for 208/230V/1Ph and 208/230/460/575V supply voltages
  • Premium control box with separate line voltage and low voltage terminal strips
  • High and/or low gas pressure switches
  • Many options/accessories such as fan delay relay, smoke detector, timed freeze protection, mild temperature thermostat, airflow proving switch, room and duct stats, etc.

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