First launched in 1981, the Excel NE has long been the standard toilet for those living off the grid. A 1998 redesign gave the unit a rounded look, and recessed the drum handle. The Excel NE has no fan or heater. Odorless operation is achieved by a 4" vent mounted at the top rear of the unit which acts like a chimney on a wood stove. For good air movement the vent should be as close to vertical as possible. If the Excel NE is used residentially or heavily, or is in a place which is subject to downdraft, an optional 12 volt fan should be installed in the vent stack. This fan draws 1.9 watts and can be powered by a solar panel and 12 volt battery. The fan should also be installed if there is to be any bends in the vent stack, as the "chimney effect" is negated by a bend.
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