Passive Attic Ventilation

This type of ventilation is especially important for.

Passive attic ventilation.

Passive roof vents expel excess heat and moisture. Passive roof vents encourage natural air flow and work without the aid of motorized fans. The keepa attic vent is used for ventilating attics and or plenum as a roof exhaust vent or as an air intake roof vent. The keepa attic vent is built exclusively for flat roof ventilation roof pitch is 2 12 or less.

After installation the only maintenance needed is periodical cleaning of the filters. It is also ok if you have a little more air coming in than you do going out ie. It alleviates moisture in the winter and heat in the summer to extend roof membrane life. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic.

Active ventilation is a system that provides air circulation in indoor spaces using mechanical fans. You don t want your unfinished attic cooled by your air conditioner. In order to facilitate this exchange of warm and cool air the general rule of. Soffit venting is your main source of intake for an attic.

This method relies primarily on natural air convection the upward movement of heated air because of its lower density but may also take advantage of wind generated pressure differences. To prevent this follow the air sealing and insulation strategies in this guide and make sure the attic is well ventilated using passive vents and natural air flow. Calculating attic passive ventilation building codes require that vented roofs have a specified amount of ventilation area. Passive ventilation doesn t require electricity so it saves energy and cuts down on carbon monoxide emissions.

Passive ventilation the most common way to provide attic ventilation for asphalt shingle roof assemblies is by nonpowered passive ventilation. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator. Laying fiberglass rolls is easiest for a diy job. This is usually expressed as a ratio.

The key is to balance incoming air with outgoing and perform an annual maintenance checkup. A good goal with attic ventilation is to have a balanced amount of air coming in to the attic as you have of air leaving the attic. Lots of soffit venting.