FAMCO Square to Round Transition Box - Galvanized | FAMCO
QF Transition Rectangular to Round | Products | Nordfab
204x60mm Rectangular to 100mm Round Adaptor – Verplas | A Breath of Fresh Air
Sirius Straight 200mm Round to 200x90mm Rectangular Duct Adapter (SPS-
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Sheet Metal Duct Transition, Manufacturing Ductwork Supplier
Kair Ducting Adaptor 220mm x 90mm to 150mm - 6 inch Rectangular to Round Straight Channel Connector for Converting to Different Size Duct Systems : Amazon.co.uk: DIY & Tools