Indoor Gravity Vented Gas-Fired Duct Furnace (DFG)
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/h and can operate on either natural or propane gas, with an airflow range of 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 use in the US and Canada
- 81% thermally efficient
- Blocked vent safety switch (model DFG only)
- Factory-installed power vent with differential pressure switch for proving proper venting (model DFP only)
- 20-gauge aluminized steel cabinet
- 115V control step-down transformer with 24V gas controls\
- 409 Stainless steel heat exchanger, drip pan
- Stainless steel burner with stainless steel separator strip
- Certified to 3.0” W.C. external static pressure
- Single-stage intermittent pilot with continuous retry control system for natural or propane gas operation.
- Right side access to burner and gas controls (when looking into the discharge) with slide-out burner drawer
- High limit safety control
- Control terminal board
- Designed, Engineered & Assembled in the USA
- Two-stage or electronic modulation controls for either natural or propane gas
- Building management compatible gas controls for modulation control using a 0-10 Vdc
- Multiple-furnace electronic amplifier for controlling up to 4 duct furnaces with one discharge air sensor
- Gas control step down transformers for 208/230V/1Ph and 208/230/460/575V supply voltages
- Left side access to burner and gas controls
- Adjustable differential air flow proving system
- Fan delay timer
- High and low gas pressure switches
- Timed freeze protection
- Supply air fire stat
- Control relay – double pole, double throw
- Separate line voltage and low-voltage terminal strips
- Premium control box and gas control string
