Solar Fan / Solar Powered Exhaust Ventilation Products:

Solar Attic Fans, Solar Roof Vents & Accessories

Solar Fan Manufacturers Items:

  Box Roof Vents (large commercial roof vents and flat roof vents)

  Vent Caps, Breather Caps

  Attic Tune-Up systems advanced roof venting systems

  Roof Ventilation Diagrams

Roof Ventilation Basics:

• During the summer, when the outside temperature is typically much higher than the inside temperature, attic ventilation serves to help cool your house. An unfinished attic builds up a tremendous amount of heat, and if that heated air has no place to escape, it can make the inside of the house much warmer or cause an air conditioning system to work much harder to cool the house.
   
• There are a wide variety of sources of moisture in a home, from the building materials themselves to normal everyday activities. For example cooking, bathing and washing clothes all release gallons of water vapor into the air.
   
• That vapor isn't a problem inside the average home because the temperature inside the home is warmer than outside for much of the year. Warm air holds more moisture–in the form of water vapor–than cool air.
   
• The problem is that vapor gradually works its way out of the living area and into the structure. As warm, moist air cools, the vapor begins to condense into water droplets. If that happens inside an unfinished attic, for example, it can get insulation and framing materials wet. That not only reduces the value of your insulation but can cause mold, mildew and rot.
   
• Building codes specify the minimum amount of attic ventilation needed in a new home to prevent winter moisture buildup, but your summer needs are much greater. Also, older homes were often built with inadequate attic ventilation–at least by today's standards–and may need to be retrofitted with proper attic ventilation.
   
• A good attic ventilation system is designed for summer needs and moisture. It includes two types of vents: intake vents are placed along the soffit to allow fresh air into the attic, and exhaust vents are installed in the upper third of the roof to allow attic air to escape. The object is to create a continuous "wash" of air along the underside of the roof sheathing. The rule of thumb for summer months is that you should provide enough ventilation to completely change the air in your attic every six minutes.
   
• There are several types of intake vents:
   
  • Gable Vents can provided in most any shape to compliment house architecture. Gable vents are installed in a gable wall just below the peak of the roof. These vents are cost effective yet provide a lot of net free vent area. They can function as both intake and exhaust vents, depending on the roof design.
     
  • Soffit Vents, Under-eave vents are made usually with a screen to keep insects out and of an aluminum panel with louvers punched into the face to allow air flow.

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