We often get asked what size American flag should you purchase with the size flagpole you are getting. What we tell people is to purchase a flag where the length of the flag is roughly 1/4 to 1/3 the size of the flagpole.
For instance, if you have a 20 foot telescoping flagpole, we would recommend a 3×5′ Reinforced Nylon or a 4×6′ Reinforced Nylon U.S. flag. You really don’t want to go over this measurement as it puts a lot of stress on the flagpole to carry a heavy load.
Also, keep in mind that if you are going to be flying two flags from a flagpole to reduce the size to 1/4 of the length of the flagpole for the flags. Every flagpole has a wind rating based off of being flagged and unflagged. You can check out our complete lineup of flagpoles both commercial and residential by going to our website www.martinsflag.com.