Superior Bi-Fold Glass Fireplace Door, Easy to Install, Fits 42 5/8 x 21 Inch Opening The Best Value Superior Prefab Zero Clearance Door in the Industry. The EZ Door provides the safety, efficiency, and beauty that you would come to expect from a premium, custom, glass fireplace door at a fraction of the price you would pay for other models. TIP: Check your Superior Model number and measure your fireplace before ordering. The frame on these doors measure: 42 5/8" x 21", fits Superior models: KC43, KC43-2, B943, B1043, B1243, BCF4385, BRF4375, CF4360, HC4320, HC4320A, HCE4550A, KR43, RD4300, RD4300A, SHC43, 1043, CHD43 Custom built prefab zero clearance door priced to fit your fireplace and budget. Bi-fold track doors, which open a full 90 degrees with ease, stylish black aluminum frame 1 1/8" width, and clear, tempered 3/16" safety glass. Backed by an unbelievable two-year warranty. The EZ Door is incredibly easy to install. In fact, it installs with a screwdriver and drill, so, you can spend more time enjoying your new fireplace, rather than building it. Step by step instruction included. Email us if you have questions and we can give you a call. GOT QUESTIONS? Click on the Sold By fireplaces net link (under the price and beside stock status). Then when you are on our store page go to the right hand side of page and scroll down to Further Information &gt; Contact Seller. We answer all email promptly and are here to help.