U Factor And Shgc Standard French Doors

Each rating is split into two values.

U factor and shgc standard french doors.

It s usually expressed in units of btu hr ft2 of. In the southern zone skylights must have a u factor of 0 60 or less and an shgc of 0 28 or less. The u factor requirements discussed above for vertical fenestration also apply to exterior glass doors. Solar heat gain coefficient shgc a measure of how well a glazed door assembly absorbs or reflects heat from the sun.

This tool provides some of the most common options on windows and doors and related nfrc certified values. 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. Solar heat gain and u factor. Solar heat gain coefficient measures how well a product can resist unwanted direct or indirect solar radiation.

The same shgc cap of 0 50 that applies to vertical fenestration in climate zones 1 to 3 also applies to skylights. 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. U factor is the rate at which a window door or skylight conducts non solar heat flow. Doors are a little different.

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. 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. The u factor of skylights in climate zones 4 to 8 is not to exceed 0 75. Glazed doors in hot or temperate climates should have a low shgc.

In the south central zone skylights must have a u factor of 0 53 or less and an shgc of 0 28 or less. Nfrc u factor ratings however represent the entire window performance including frame and spacer material. For windows skylights and glass doors a u factor may refer to just the glass or glazing alone. Energy performance data for select combinations of options is available in table format on each product page.

The lower the coefficient the better the glazed door is at blocking the sun s heat. This radiation can cause your home to heat regardless of outside temperature which. The circled value shows you the rating a door has received. Doors must now have a much lower u value also known as u factor see below and solar heat gain coefficient before they can earn the energy star label.