Glossary of termsDefinition of words generally found within this website.
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Word:
C.O.S.
Definition:
Call Out Size (C.O.S.)
The nominal size of a window or door. The "name" of the size.
The call out size is the outside window or door frame measurement.
Example: A window that is 4ft wide and 4ft high (overall) would have a call out size of 4040.
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