Passive Attic Ventilation

Passive roof vents encourage natural air flow and work without the aid of motorized fans.

Passive attic ventilation.

The keepa attic vent is used for ventilating attics and or plenum as a roof exhaust vent or as an air intake roof vent. This is usually expressed as a ratio. This type of ventilation is especially important for. Roof vents enhance the overall comfort of the house by providing escape hatches for hot stale moist air which can reach temperatures of 150 degrees in summer.

Passive roof vents expel excess heat and moisture. Calculate or enter the square footage of the attic or area to be vented. It is also ok if you have a little more air coming in than you do going out ie. 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.

In order to facilitate this exchange of warm and cool air the general rule of. Active ventilation is a system that provides air circulation in indoor spaces using mechanical fans. It alleviates moisture in the winter and heat in the summer to extend roof membrane life. Laying fiberglass rolls is easiest for a diy job.

Soffit venting is your main source of intake for an attic. Passive ventilation doesn t require electricity so it saves energy and cuts down on carbon monoxide emissions. 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. 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.

After installation the only maintenance needed is periodical cleaning of the filters. Passive ventilation the most common way to provide attic ventilation for asphalt shingle roof assemblies is by nonpowered passive ventilation. 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.

Calculating attic passive ventilation building codes require that vented roofs have a specified amount of ventilation area. The keepa attic vent is built exclusively for flat roof ventilation roof pitch is 2 12 or less. The key is to balance incoming air with outgoing and perform an annual maintenance checkup.