The success of the Excel design meant that a three chamber unit could be specifically designed for those with NO continuous 110 V supply. First launched in 1981, the EXCEL NE has long been the standard toilet for those living off the grid. The EXCEL NE has no fan or heater. Odorless operation is achieved by a 4 in 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 installed vertically and to 2 to 3 ft above the peak of the roof. The optional 12 V fan should be installed if you need to install the toilet with any bends in the vent. No more than two 45 deg bends are encouraged, even with the fan. If the EXCEL NE is used residentially or heavily or is in a place which is subject to downdraft, the optional 12 V fan should be installed in the vent stack. This fan draws 1.4 W and can be powered by a solar panel and 12 V marine battery. Evaporating capacity on the EXCEL NE is variable, so the 1 in drain at the rear should be connected to an approved drain pit, container or other facility.

• Two adults or family of three, residential use
• Five adults or family of seven, weekend and vacation use