150mm (6") to 100mm (4") Round Duct Reducer *One Piece Reducer Takes Less Space*
150mm (6") to 100mm (4") round duct reducer.
Instead of using a 150mm to 125mm, then a 125mm to 100mm you can now use this one reducer which only needs the space of one reducer.
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100mm (4") Telescopic Duct 200-350mm With Reducing Ring & Round 100m 4" Grill *Extract Fan Ducting Kit*