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Should you keep crawl space vents open or closed? 'If you close unsealed ones without a dehumidifier, you're in trouble' – experts reveal how and when to close for less ...
run lower than the automatic crawl space vents like this Master Flow Automatic Foundation Vent from Home Depot, which can be as high as $50 per unit or more, depending on the model.’ Further up ...
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Are Styrofoam Plugs A Good Option For Winterizing Foundation Vents?
Because Styrofoam plugs cannot handle contact with moisture well, you may want to consider installing a product like the Master Flow Automatic Open/Close Foundation vent covers from Home Depot.