Recommendations for Intake / Exhaust Vents for HRV
Is there a best intake and exhaust vent installed through the rim joist of a house. My HRV will be installed in the crawl space. The intake and exhaust will be 4″ installed in the rim joist. I am wondering if there is a better vent to use than one with just a flapper for the exhaust. Does anyone have a recommendation? Thanks.
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