Glad I have an electric dryer. I have a box with a flap in it. Move the lever one way and the heat comes in for the winter. Move it the other way and outside for summer. My house stays too dry in the winter so moisture isn't an issue. A screen stops lint from entering the house and is easily removed for cleaning. (lint that I collect and use as fire starter in the wood stove) You guys that are making a system might want to thing about a bypass for summer if you haven't already. I doubt you want the extra heat when it's 90 degrees out.
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