
This picture sent in by a customer is a perfect illustration of how to measure your factory built fireplace for doors. The customer has precisely measured the firebox opening (36" x 20") and from this measurement we will be able to make the right door.
Note: UL requires fireplace glass doors to have a 1/8" gap for proper ventilation and cooling. When you get an email from us confirming your measurements, we will be taking this 1/8" gap into consideration.