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Building codes and roof shingle warranties require that sloped roofs be ventilated for the following reasons:<br><br><ul><li>It lowers summer attic temperatures, extending shingle life and cutting cooling bills. </li><li>It rids the attic of
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Broan-NuTone 505 Exhaust Fan, White Vertical Discharge Ceiling Ventilation Fan, 8.5 Sones, 200 CFM, 8" - Built In Household Ventilation Fans - Amazon.com
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