125mm to 100mm Galvanised Duct Reducer for Spiral Ducting A Concentric reducer changes the diameter of a duct run to assist air flows. All of our reducers are concentric, eccentric reducers are available on request. Reducers up to 315mm diameter are pressed reducers, 355mm and above are fabricated reducers. Reducers for spiral ducting are all male fittings and fit directly into circular spiral ducting (secure using recommended fixing methods). A Female Coupler will be required when joining two male fittings together Standard sizes are listed, for custom sized reducers, please contact us. Can also be used to increase pipe size in a duct run. Engineered from lightweight galvanised steel.
