Shrink your energy bill, save money and earn a home tax credit all at once. The SDFM-20 reduces heat gain! The SDFM-20 can vent up to 1,275 cfm of hot air during the summer. By reducing the amount of radiant heat that is conducted by the ceiling, heat gain within the interior can be dramatically reduced. Attic temperatures can reach 170° F or more in the summer. That translates to ceiling temperatures of 100° F or more. By venting heat within the attic before it is conducted by the ceiling, ceiling temperatures can be lowered by 10°-30° F. Interior room temperatures can be lowered by 5°-15° F. Lower room temperatures also increase the life of wall coverings, floor coverings, furniture and other home furnishings. Over time, lowering home maintenance expenses can save you money as well. There is also a tax credit for energy efficient homes. Remember: heat is the enemy-except when you're cold.

It is no secret that during any given summer day, most attic temperatures can reach temperatures well above 170 degrees. It is for this reason, most homes have soffit ventilation coupled with several small vents and gable and / or ridge vent ventilation. This is called passive or convection ventilation, the theory simply stated, “hot air rises. Hot air also expands and radiates. This is called “heat oppression”. Your roof holds heat; the air in your attic holds heat. Everything in your attic holds heat. Every morning the sun comes up and the roof of every home begins to broil. The air in your attic begins to expand, in every direction, not just up. There is no question the vents at the ridge of your home will exhaust air, but only as it is warmed to the point of expansion. In short, the convection ventilation process actually requires a certain amount of heat retention to begin the ventilation process! Once it’s started, the battle is already lost! Your roof will never be cooler then the heat load point required for convection.