Whirlybird Vs Attic Fan

In summer air movement helps rid the attic space of.

Whirlybird vs attic fan.

The average domestic whirlybird moves around 100 cbm h at around 12 km h wind speed. Without any air movement temperatures in the attic soar in summer and plunge in winter. When considering ventilation for your attic it is very important to take into account moisture as well as heat as mold growing inside your attic is much worse than mold growing on the roof shingle surface on the outside. A largely arbitrary rule of thumb that s been adopted into most building codes calls for 1 sq.

Also since the fan is powered by the sun it should turn off when the sky is overcast during a storm which will keep it from drawing rain into the attic. It is a con to make people think the spinning action is like running a fan and mechanically drawing hot air out. Full length ridge vent in combination with soffit vents is best. Although they don t work at night due to the lack of sunlight this is typically a non issue because they re most needed during the day when the sunrays are heating up your roof and attic.

They re also quieter than whirlybirds and operate all year round. Without ventilation unfinished attic spaces can end up having stagnant air. The whirly bird or turbine vents are worse than useless. With this said neither the turbine nor the ridge vent will act upon moisture.

Of vented area for every 300 sq. Since your solar vent fan only moves 500 cfm a third to half that of a typical hardwired attic vent fan it probably won t move enough air to reverse the action of the ridge vent. Air movement in the attic helps prevent moisture buildup on rafters and on the bottom of roofing materials. A solar fan doesn t rely on the wind and it actually has a more powerful motor in it so it keeps the temperature of your attic regulated regardless of wind conditions.

They make noise too. Roof vents vs whirly birds. How much air must be moved. The sun does that.

A solar fan is able to actively pull more air into your attic than a turbine can.