The ducted Suburban NT Series propane gas furnaces were used in Airstreams and other vintage trailers from the 1970s and later. The styles have changed somewhat, but they are generally the same size and shape as the originals, making them the proper replacement furnace for older NT units of a similar BTU rating.
Cabinet size is the same on all models, providing a standardized size with three capacity options (see below). NT Series furnaces are not difficult to install, but some of the internal hot air ducts and gas line locations are slightly different than the original. Using flexible pipe and ducting, you can make the connections to your old system. See below for helpful documents.
All three NT models have two 4" round ducts on the left side and two more on the right side. They also have one rectangular duct on the bottom. When you receive the furnace, either 3 or 4 side ducts will be open (see ducting specs below) and the bottom duct will be closed.
To use the bottom duct, you must close the side ducts and use a duct adapter for the bottom. These parts must be purchased separately. If you are using side ducts, you will need the round duct collars.
All units include:
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