U Factor And Shgc Standard French Doors

To be labeled as an energy star qualified product the nfrc ratings u factor and shgc or solar heat gain coefficient ratings must meet the 2015 energy star eligibility criteria for.

U factor and shgc standard french doors.

U factor shgc solar heat gain coefficient product type any awning casement double hung fixed casement french door horizontal slider picture window side lite transom single hung sliding glass door storefront door storefront window. The lower the coefficient the better the glazed door is at blocking the sun s heat. Solar heat gain coefficient measures how well a product can resist unwanted direct or indirect solar radiation. Each rating is split into two values.

In the south central zone skylights must have a u factor of 0 53 or less and an shgc of 0 28 or less. The u factor of skylights in climate zones 4 to 8 is not to exceed 0 75. For windows skylights and glass doors a u factor may refer to just the glass or glazing alone. In the southern zone skylights must have a u factor of 0 60 or less and an shgc of 0 28 or less.

Glazed doors in hot or temperate climates should have a low shgc. This radiation can cause your home to heat regardless of outside temperature which. U factor is the rate at which a window door or skylight conducts non solar heat flow. The u factor requirements discussed above for vertical fenestration also apply to exterior glass doors.

To access those tables select the individual product of interest and scroll down to the professional resources section. It s usually expressed in units of btu hr ft2 of. Nfrc u factor ratings however represent the entire window performance including frame and spacer material. The milgard energy calculator provides a quick and easy way to help you select windows and doors that can meet local energy codes and project requirements.

Energy performance data for select combinations of options is available in table format on each product page. This tool gives you the flexibility to select the required energy star zone u factor shgc or vt and determine which milgard window and door products meet the selected requirements. Doors are a little different. This tool provides some of the most common options on windows and doors and related nfrc certified values.

In southern climate zones 1 to 3 southern tennessee to the tip of florida there is no u factor cap but the shgc is not to exceed 0 50. South facing glazed doors in cold climates should have a high shgc. Solar heat gain coefficient shgc a measure of how well a glazed door assembly absorbs or reflects heat from the sun. The circled value shows you the rating a door has received.