Master Flow ERV5 Roof-mount fans are installed from the exterior of the roof. Because they can be seen from the curb, we like the Master Flow ERV5 power roof-mount vent’s sleek profile.

The recalled attic fans were sold at several stores and wholesalers nationwide, including ABC Supply, Lowe’s and Beacon Hardware.

Q - I think I need better ventilation in my attic. Is there a problem with using a ridge vent and a power-ventilated fan in my attic?