Terms
Indoor Separated Combustion (DFS)

The indoor separated combustion duct furnace was designed as a building's primary room heating source and is certified for, non residential, commercial applications only. Separated combustion duct furnaces are specifically designed for buildings with hostile atmospheric conditions such as high humidity, contaminated indoor air or rooms with negative pressure. Available in 11 power exhausted model sizes, the unit covers a wide variety of applications. Input ranges from 75,000 to 400,000 btu/hr for either natural or propane gas.

Airflow direction can be specified for location downstream from the dehumidifier and has a drain pan that allows connection to a condensate drain line. There are many other options available including various types of gas valve controls to suit specific requirements.
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Model #

Btu/Hr Input

Btu/Hr Output

Gas Connection Pipe Size

Approximate Unit Net Weight

Approximate Unit Shipping Weight

DFS 75 N/A 75,000 N/A 60,000 N/A 1/2 in N/A 151 lb N/A 226 lb
DFS 100 N/A 100,000 N/A 80,000 N/A 1/2 in N/A 170 lb N/A 250 lb
DFS 125 N/A 125,000 N/A 100,000 N/A 1/2 in N/A 170 lb N/A 250 lb
DFS 150 N/A 150,000 N/A 120,000 N/A 1/2 in N/A 188 lb N/A 273 lb
DFS 175 N/A 175,000 N/A 140,000 N/A 1/2 in N/A 188 lb N/A 273 lb
DFS 200 N/A 200,000 N/A 160,000 N/A 1/2 in N/A 230 lb N/A 325 lb
DFS 225 N/A 225,000 N/A 180,000 N/A 1/2 in N/A 230 lb N/A 325 lb
DFS 250 N/A 250,000 N/A 200,000 N/A 3/4 in N/A 275 lb N/A 385 lb
DFS 300 N/A 300,000 N/A 240,000 N/A 3/4 in N/A 275 lb N/A 385 lb
DFS 350 N/A 350,000 N/A 280,000 N/A 3/4 in N/A 329 lb N/A 454 lb
DFS 400 N/A 400,000 N/A 320,000 N/A 3/4 in N/A 329 lb N/A 454 lb
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