Determining Flag Size
The length of the flag should be at least ¼ the height of the pole. For example, a 40-foot pole requires a 6′×10′ flag or larger. This guideline applies to poles 20′ and larger. Most residential flags are 3′×5′ or 4′×6′. Most small industrial and commercial buildings use either a 5′×8′ or a 6′×10′ flag. Major industrial, municipal and government buildings require 8′×12′ and larger. However the size of the pole is the determining factor.