U Factor Sliding Glass Door
It s a measure of total heat flow through a window or door from room air to outside air.
U factor sliding glass door. A u value also known as u factor measures how much heat or cold passes through the window or the door. U factor is the rate at which a window door or skylight conducts non solar heat flow. The u factor for dual pane glass products ranges from 0 49 to 0 51. Dependable security high durability and easy operation are just a part of the inside story on how sunrise has transformed a good idea into a great sliding door for every home style.
For windows skylights and glass doors a u factor may refer to just the glass or glazing alone. It s usually expressed in units of btu hr ft2 of. Simply put u factor measures how well a window keeps heat inside your home. In the southern zone skylights must have a u factor of 0 60 or less and an shgc of 0 28 or less.
Glass doors by definition in the iecc are considered to be those which are more than 50 percent glass in area. Nfrc u factor ratings however represent the entire window performance including frame and spacer material. If the door is equal to or less than 50 percent glass it is considered to be an opaque door. Also called sliding glass doors these doors are designed to glide horizontally with one operating panel and one stationary panel.
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 u factor requirements discussed above for vertical fenestration also apply to exterior glass doors. Doors are a little different. It s a particularly important measure for climates with colder winters.
They fit into tighter spaces than our hinged doors because their panels don t interfere with your room or patio. The door panels are specially designed to allow for maximum viewing area and strength to withstand daily use. Lower numbers indicate greater insulating capabilities. In the south central zone skylights must have a u factor of 0 53 or less and an shgc of 0 28 or less.
Basic dual pane glass is available on most andersen 200 series windows the perma shield patio door and the narroline gliding patio door. It basically tells you how well a door or window insulates the home.