Roof Ridge Vent And Exhaust Fan

First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic.

Roof ridge vent and exhaust fan.

Second during cold winters you ll be blowing warm moist air onto a cold surface the roof vent and roof plywood. Fan rarely necessary vents that run along the roof ridge are an alternative to those that exit through the roof decking or gables and if the ridge is long enough they may be the only roof vents. Ridge vents are a passive system simply allowing hot air to rise up through them rather than pushing it out as a fan does. By installing more roof vents such as a ridge vent you increase the possibility that most attic air will come from outside says tim carter a residential contractor in cincinnati.

If you re tempted to vent your exhaust fan through an existing roof vent or even vent it into the attic don t do it. If you have few vents in your attic most of the air will be drawn from inside the house. Combining an attic power vent fan with a ridge vent is usually not recommended because. It could reverse the natural flow of hot air out the ridge vent.

In this case the ridge vent pulls its intake air from the power fan which can lead to weather infiltration and poor ventilation along the underside of the roof deck. Ridge vent like attic fans ridge vents are designed to exhaust air that is already inside the attic. If air is drawn in through the ridge vent while it s raining it might pull rainwater in with it which could lead to leaking or mold in the attic. When the power vent goes off it acts like a roof louver an opening on the roof without a motor.