Harman Coal Stove Door Glass - Triple Frame (3-40-450850)

Replacement door glass for Harman coal stoves. Measures 4-1/2 X 8-1/2. Sold per one, some of these stoves have 3 pieces. Fits the following Harman coal stove models:Magnafire Elite Insert - 3 requiredMark II - 3 requiredMark III - 3 requiredSF150SF250Harman part number 3-40-450850OEM Harman part.This is an excellent replacement in most applications for any of the following glasses - PYREX®, BOROFLOAT® , TEMPAX® , VYCOR® , PYROCERAM® , and NEOCERAM® .Typical ApplicationsWood Burner Stove, Mulyi fuel stoves, Pellet Stove and Coal Stove WindowsWood and Gas Fireplace DoorsHigh-intensity Light CoversFurnace Observation WindowsBarbecue Grill WindowsGrill Covers and TrivetsSpark and Flame Guard panels.This material is actually a transparent glass-ceramic. ROBAX® glass-ceramic has a thermal endurance far exceeding that of normal tempered glass. Tempered glass is generally limited to applications that do not exceed 500F. However, ROBAX® is designed to operate at temperatures ranging from minus 400F. to plus 1400F.Glass-ceramic was invented in the 1960s. Its thermal endurance and stability make it ideal for many products: from stove tops and cookware, to missile nose cones and astronomical telescope mirror substrates. Transparent glass-ceramic, introduced in 1970s, is much more difficult and expensive to make than ordinary glass. As a result, it also has a different appearance including color, surface texture, and some small bubbles or inclusions that are natural to its composition and have no effect on its strength or performance.Because of its special composition and processing this unique material can withstand a quench into ice water from red hot temperatures. With ROBAX® Glass-Ceramic windows in your stove or fireplace, you can enjoy the fire view with the assurance the window has been designed with a superior margin of safety for your home and your family.This is an excellent replacement in most applications for any of the following glasses - PYREX®, BOROFLOAT® , TEMPAX® , VYCOR® , PYROCERAM® , and NEOCERAM® .