Galvanised Female Duct Coupling – Metal Ducting Joiner

Galvanised Steel Female Duct Coupling – The Small Part That Stops Big Leaks

Every ventilation job has the same weak point, and it's never the fan or the duct itself. It's the joins. A loose connection leaks air, rattles, lets moisture escape where it shouldn't and quietly drags down the efficiency of the whole system. This female duct coupling is a simple, precisely made galvanised steel sleeve that joins two male-ended fittings together snugly, so the air goes where you sent it.

Perfect For

Extending cooker hood and kitchen extract runs, tumble dryer and utility room venting, bathroom and loft extract fans, workshop dust and fume extraction, greenhouse and conservatory ventilation, and joining any two male duct fittings such as T pieces, Y pieces, reducers and bends.

Key Features

• Female-to-female joiner for connecting two male-ended fittings
• High-quality galvanised steel: rigid, durable and corrosion-resistant
• Accurately sized for a close, low-leak fit
• Reusable and easy to seal with foil duct tape
• Six standard sizes from 100mm (4") to 315mm (12")

How to Fit

Push the two male fittings into each end of the coupling until snug, then seal around both joins with aluminium foil duct tape for an airtight finish.

🔧 Pro-Tip: measure your duct's internal diameter before ordering. Most UK domestic extract fans use 100mm (4") ducting, while cooker hoods are typically 125mm or 150mm.

Sizes

100mm (4"), 125mm (5"), 150mm (6"), 200mm (8"), 250mm (10") and 315mm (12").

Black Flag Horticulture Ltd, Coventry.