Monessen ID4 4″ (100mm) insulated flex duct for outside air kit

Monessen ID4 4″ (100mm) insulated flex duct – includes two 42″ (1065mm) sections

For use with AKD outside air kit, and AK22

For use with the Monessen fireboxes and fireplaces such as the ACUF32-BD, ACUF32-GD