Return to List of FAQs Question 17: I have heard of water dripping from the grille or mirrors not clearing quick enough. Is the fan not operating correctly?
• Water dripping from the grille is either a faulty roof jack that allows wind-driven rain to come into the duct or condensation from the warm, humid air in the house striking the cold duct surface. Condensation is a problem that generally happens when uninsulated metal duct is located in a cold attic. As we said in Question 13, this will vary with the local dew point, but will generally not be a problem where the duct never gets below about 50 . If you get condensation dripping from the grille, it probably means that the metal rough-in adapter on the fan or the duct in the attic or even the roof jack is getting so cold that the warm air rising up the duct from the house is condensing and running back down the duct. • How can you solve this problem? Two things help. First, operate the fan for longer periods to carry out more of the moisture so the air is not so humid after the fan stops running. The moisture will generally not form while the fan is running unless it is very cold or has
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