Please look at pictures above for measuring explanations. INSIDE FIT ONLY- FOR FIREBOX OPENING SIZE: For measurements up to 44"w x 31"h see price above. For measurements up to 50"w x 39"h, add $150 to price above. For larger sizes, please call for a price quote. Lead time 2-3 weels for stock doors and 4-6 weeks for custom fireplace doors. Custom doors are non-refundable once construction has begun. Thermo-Rite doors are made in the U.S.A. Benefits: Life guarantee on glass Tarnish free frames mean no polishing! Many styles and finishes to choose from Mounting hardware and instructions included The Phantom is an anodized aluminum enclosure with thin 1/4" sides and a 3/4" wide top and bottom frame. It is available as inside fit only. "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