The LunarVent solar-powered vent fan from LunarGlo is designed for portable restrooms with a 4-inch exposed vent pipe.

The vent fan is capable of removing up to 20 cfm, delivering a constant flow of fresh air. The fan can run up to 50,000 continuous hours, operating only during the day when it is most needed, even on moderately cloudy days.

“It’s designed to function as a constant-velocity air evacuation system that promotes constant flow of fresh air through the holding tank and out the vent pipe,” says Rex Barton, product designer and RJ Products co-owner. “The solar cell on our fan unit drives the fan motor directly — there are no battery packs or anything else.”

The vent fan is made to be easy to install and replace, Barton says. “It’s not permanently mounted. You just reach up and slide this thing over the pipe,” he explains.

To enhance the user experience, Barton recommends adding a scented biscuit attached to the grill at the top or bottom of the portable restroom.

“We hang one of those scented biscuits on the vent inlet side of the portable restroom where the fresh air comes in, so it draws air past that scented biscuit, but it’s constant,” he says. “The people that we have tested this with come out of the portable restroom saying, ‘Oh my gosh, it smells nice in there. I’ve never been in one that smells nice.’” 574/294-2624; www.lunarglo.com.