FAQ Knowledge Articles

Commercial doors have the net clear openings listed below.  A two panel commercial door net clear opening (NCO) is show with both panels open.  If a commercial door has a removable mullion, the NCO with one panel open will follow the formula (NCO - 2") / 2.

Wood Commercial Door
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Clad Commercial Door
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WCD Example:
CN60 NCO width 67 5/64"
(67 5/64" - 2") / 2 = (65 5/64") / 2 = 32 17/32" NCO for one panel open with a removable mullion on a 1 3/4" WCD.

For more information, see:
What is a Commercial Door?