Installing an “air head” composting toilet in a motorhome.

This is a high-level overview of installing an airhead composting toilet in my motorhome. The airhead installation instructions are pretty good; however, I had to deviate from these instructions for the roof vent. My motorhome ceiling/roof is 3-inch thick Styrofoam sandwiched by Luan paneling. Venting a composting toilet into a ceiling that’s isn’t completely sealed will allow orders from the composting waist to vent into the RV. So I used a 1-1/2 inch vent pipe up and through the ceiling and roof then installed weather proof vent cap on the pipe.