Passive Attic Ventilation

It s quiet inexpensive energy efficient and low maintenance because it requires no moving parts and has no operating costs.

Passive attic ventilation.

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

It alleviates moisture in the winter and heat in the summer to extend roof membrane life. The keepa attic vent is built exclusively for flat roof ventilation roof pitch is 2 12 or less. Laying fiberglass rolls is easiest for a diy job. 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.

This is usually expressed as a ratio. Active ventilation is a system that provides air circulation in indoor spaces using mechanical fans. Soffit venting is your main source of intake for an attic. The key is to balance incoming air with outgoing and perform an annual maintenance checkup.

Calculate or enter the square footage of the attic or area to be vented. Calculating attic passive ventilation building codes require that vented roofs have a specified amount of ventilation area. Lots of soffit venting. 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.

It is also ok if you have a little more air coming in than you do going out ie. This type of ventilation is especially important for. 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.

Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. You don t want your unfinished attic cooled by your air conditioner. After installation the only maintenance needed is periodical cleaning of the filters.