Soffit-Vent Solution
This polypropylene vent has a smooth shape for maximum airflow, and it is installed at the same time as the fan.
In an effort to keep the run as straight and short as possible and make their lives easier, many builders route a bath fan’s ductwork to the soffit. Unfortunately, typical fan outlets for soffits don’t work very well because the vent is connected by the soffit installer, who needs extra length in the duct to allow it to be pulled down, terminated, and then pushed back into place. This extra hose leaves twists and turns in the ductwork, reducing airflow. A simpler solution is the EZ Soffit Vent, distributed by Panasonic. The polypropylene vent has a smooth shape for maximum airflow, and it is installed at the same time as the fan, so the duct can be pulled tight for peak efficiency. Complete with a paintable grill, the EZ Soffit Vent is $25 and made for 4-in. ductwork. Designed by Wisconsin energy consultant Joe Nagan, it’s easily one of the best problem-solving building products to come across my desk in recent memory.
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As with all air ducts, future cleaning must be considered. Lint & paper particles will accumulate inside the duct. A duct run with a sharp elbow at both ends will make cleaning difficult, as will the 'struts' visible inside the elbow shown in this picture.