Flexible insulated duct

[mannerofspeakin]

House built in 1990. Need to replace a run of flexible duct work. The ductwork that needs replacing has a "9'" stamped on it next to its manufacturer information on the outside, which should mean 9 inch duct right ? I guess my trouble is that I can't find 9 inch flexible duct easily or at all. Any ideas ? This duct feeds three vents. Other ducts coming from air handler are this same size while others are 10 inch.

[MaintenanceMan]

They do make 9" flex duct. You most likely will never find it at a home center though. Most likely you'll have to go to a supply house. You don't see 9" used very often. Measure the diameter of the pipe to make sure it is the correct size.

[mannerofspeakin]

They do make 9" flex duct. You most likely will never find it at a home center though. Most likely you'll have to go to a supply house. You don't see 9" used very often. Measure the diameter of the pipe to make sure it is the correct size.

Thanks. It is 9 inches. Are there some ways to convert current opening to something more common ? Like an adapter or something ?

[MaintenanceMan]

Thanks. It is 9 inches. Are there some ways to convert current opening to something more common ? Like an adapter or something ?

Possibly, but it is probably 9" for a reason. Best to go back with that if it hasn't been giving you any trouble airflow wise.