General Information - Borrowed Lites/Sidelites

What is a borrowed lite?
Any form of glazed opening in a wall that does not include a door.

When a customer orders a 3/0 x 4/0 borrowed lite frame, what is the net inside dimension of our frame? What is the net glass size?
The net inside dimension of our frame would be 36" x 48". The net glass size would be 35 3/4" x 47 3/4" because the deduction in glass size is 1/8" off each side (always verify with glass manufacturer). It's important to note that the nominal size of our frame is exactly the dimension called out. The dimension of the glass must be smaller to allow for the proper clearance/expansion.

What is a sidelite?
A glazed area that is connected to a door opening.

What is a mullion?
A mullion is a section of frame that divides the opening between a door and a sidelite or a separate framed glazed opening. (Always specify if mullion is being used horizontally or vertically.