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Ventilation - Flex Duct 4in

Needs to be UL 181 certified.

http://www.supplyhouse.com/Hart-Cooley-44783-4-x-25-F090-Silver-Air-Connector    $17.17 for 25 feet

 

 

4″ x 25′ LamaFlex UL 181 Class 1 Air Connector

https://www.lambro.net/product/4-x-25-lamaflex-ul-181-class-1-air-connector-2/ 

 

 

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