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  There are two different configurations that manufacturers use when installing central heating in a Recreational Vehicle. The first way is shown in the left picture and is called a plenum system trunk line fastened directly to the furnace with floor registers). The second way is shown in the right picture and is called a ducted system (individual ducting runs of 4” pipes). In both cases, the CheapHeat™ system consists of an Add-on Cabinet with an electric Heater Element, the Controller, the Remote Override Switch and Installation Kit.

Plenum system      Ducted system
Additional Graphics (click model to view PDF file)
Suburban Models: SF-21 through SF-42, SH-35 through SH-42
Atwood Hydro Flame: 8500 Series, 2450 and 8900 Series