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Attic is very popular in our house. For the attic, an effective ventilation system is very important. An effective ventilation system can Extend the Life of Your Roof,Remove Moisture and Reduce Harmful Mold and Mildew and Fight Ice Dams.
A well-ventilated attic will help reduce your energy costs several ways. Improved air circulation in the summer months will help remove hot air and reduce the temperature of your attic. This will keep the hot, stagnant attic air from seeping through into your living area. It will also help reduce the surface temperature of your attic floor and your interior ceilings.
The reduced temperature in your attic will also assist your air conditioner by keeping the ductwork and the air inside cooler. The resulting effect will be cooler air flowing through your HVAC system and reduced strain on your a/c unit.
Normally,there are 6 kinds of vents, they are ridge vents,power vents,static vents,attic intake vents,foundation vents and whole-house fans.
When it comes to intake ventilation, continuous soffit vents are the best choice. They provide a continuous flow of cool, dry air low in the attic through each rafter. Continuous soffit vents are available in PVC or aluminum for either new construction or retrofit applications.  The perforated soffit vents are exactly half the net free area of a typical ridge vent, which means they easily balance with a ridge vent. Installing continuous soffit vent on both sides of a house balances them with the ridge vent.
The intake ventilation is an essential component of a properly designed ridge vent system. Among the intake ventilation products,the perforated aluminum  and PVC soffit vent is popular.