Please look at pictures above for measuring explanations. Custom Masonry /Zero Clearance Door (Overlap Fit/Outside Mount) 40"W x 28"H (For larger sizes, please call 1-888-FPDOOR1 for a quote) Lead time: 4-6 weeks (Since the doors are custom made, the orders are not able to be cancelled once they begin construction) Product is made and shipped from Canada. This simple yet stylish fireplace door by FDM will be delightful in any home! FDM has been constructing custom fireplace doors for 35 years! They take pride in their crafsmanship by offering a guarantee for the life of the fireplace door. Details: 3/16" steel frame 100% welded construction Backing (or Smoke Bar) is constructed of 14 gauge steel Hidden damper (slider damper or no damper options are available) Every door is computer drawn to ensure a custom, perfect fit 1/4" glass is tempered to 600 degrees for durability (Ceramic glass is avaiable as an upgrade-will need to call for a quote) Finishes are either electroplated, powder coated or electroplated lacquer 11 custom handles to choose from PLEASE NOT THAT THE FDM FIREPLACE DOORS DO NOT INCLUDE MOUNTING HARDWARE!!! Measuring tips: We always recommend that you take several width measurements and several height measurements to ensure you get the proper fit. We recommend doing this because there may be irregularities in the fireplace opening. You will need to use the smallest measurement for width and height, so that the door will fit. You will also need to consider that the backing of the fireplace door recesses into the fireplace opening 2 1/2". (For zero-clearance doors, the recession is 1 1/2" into the fireplace opening) If you have any problems with obtaining your dimensions, please feel free to call 1(888)FPDOOR1 and we will assist you. "Wow! My product arrived after three days. Thanks for the fast shipping, I am glad I ordered here. My friend ordered from a different site and it took six weeks for the item to arrive!!! Keep up the good work." Mary Clarke, CA