upflow down flow updraft down draft furnace.

Many people do not understand the basic concept of how a furnace works. Most normal house units are upflow, these push the hot air up through thehouse. On the other hand mobile homes and houses on crawl or slab operate differently. The furnace has to push the hot air down to make it flow. a downflow unit work great for a garage because you are starting the hot air low, heating the floor. Before installing any type of gas or electric unit be sure to consult your local hvac specialist though. SAFTEY FIRST!!!