Spiral Duct Fittings
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Ventilation Spiral Air Duct Regulating Damper FittingVentilation Spiral Air Duct Regulating Damper Fitting
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Ventilation Spiral Air Duct Back Draught Shutter FittingVentilation Spiral Air Duct Back Draught Shutter Fitting
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Wholesale Factory Price HVAC Ventilation System Ducting V Coupling Connector Stainless Steel Air Duct Spiral Fitting ReducerSpiral Coupling 1.Spiral coupling for splicing two lengths of flexible or sheet metal round ducts together. 2.Easy to us