The following installation instructions are adapted from those provided by EcoTech, a popular fan choice of composting toilet system owners These instructions are for Model FR-100, designed for high-humidity environments. Available in 115 VAC and 220 VAC or 120 VDC. Use a fan-speed controller.

Select the fan mounting location:

• Allow sufficient access to the fan for service.
• Insert a piece of the exhaust pipe in place of the fan, when you are servicing it or the electric power has been turned off. An in-line fan is an obstruction to natural chimney effect draft, so it should only be in-line when it is meant to be continuously running.
• Mount the fan as close as practical to the termination of the vent pipe. This minimizes the transmission of vibration and motor sounds back to the toilet room.
• To prevent bathroom odors, ensure that there are no competing demands for air, such as fireplaces or bathroom exhaust fans, and open windows on the side of the building opposite the direction from which the prevailing wind blows. If necessary, cut one or two inches off the bottom of the bathroom door to supply make-up air to the stool
• Using wood screws, attach the mounting bracket for the fan motor to a support beam at the selected location. We recommend vertical mounting to reduce condensation buildup.

However, if horizontal installation is necessary, either wrap insulation around the fan or drill a ¼ in. (6.35 mm) hole in the bottom of the housing (along with a threaded insert and drain tubing), allowing condensation to drain out of the fan motor housing.

Note: Step 2 and Step 3 might be reversed.

1. Using sheet metal screws, attach the fan to the mounting bracket. Caution: Do not over tighten any rubber vibration isolation pads or grommets provided with the brackets to prevent the transmission of sound through the structure. Also take care not to strip the plastic housing on the fan.
   • Ensure that direction of airflow is up the exhaust pipe to the roof from the composter
   • Although sheet metal screws are self-tapping, we recommend that you drill pilot holes – no larger than 3/32 in.
2. Connect 4 in. (101.6 mm) ID vent pipe (drain, waste, and vent pipe recommended) to the inlet and outlet of the fan housing, using quick disconnect rubber couplings, such as Fernco flexible couplings. While the worm clamps on the couplings should be snug, take care not to over tighten (60 lb or 27 kg of torque maximum).