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Metal duct Y-pieces

Create a branch in your ventilation duct with a metal Y-piece. Choose from seven Spiro sizes, from 127 to 406 mm. Check the main duct, both branches and the connection fit before ordering. We can help you choose the right size and connecting fittings.

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Branch a ventilation duct beside your grow tent

A Y-piece creates an angled branch: one duct run can split into two, or two runs can join. Draw the airflow direction and the route to your tent, filter and extractor first. Check the space needed for the fitting and connected ducting.

Does the branch need to meet the main duct at a right angle? Browse our metal duct tees and read how to choose between a tee and a Y-piece. Choose the shape around the duct route and check that the fitting suits your layout.

Check both branches as part of the full system

Two outlets do not automatically deliver equal airflow. Duct length, bends, filters and restrictions affect the resistance in each branch. A Y-piece does not regulate airflow or increase the capacity of your fan.

Planning to connect two duct runs to one extractor? Assess the required airflow, complete ductwork and operation of both branches together. Keep flexible ducting free of kinks, support the branch and check the system after installation.

Which Y-piece diameter do you need?

Our range includes seven Spiro Y-pieces with stated diameters of 127, 160, 200, 250, 315, 355 and 406 mm. Use the diameter filter to find your size. Record the connection size of the main duct and both branches before ordering.

127 mm is different from 125 mm, and 355 mm is different from 356 mm. Check actual inside and outside dimensions and whether the duct slides over the connection. Matching size names still require a suitable fit.

Joining different diameters? Choose a suitable transition from our duct reducers. For straight joints, see our duct connectors. Read our guide to duct diameter and fit, or ask us to help check all three connections.

Spiro metal Y-piece with three round ventilation duct connections

Fittings and advice for your duct branch

Metal duct Y-piece questions

Need help planning your branch?

Send us the sizes of your main duct and both branches, a photo and the available space. We can help you choose a suitable Y-piece and connecting fittings.

  • The connection sizes of all three duct runs

  • A photo or sketch showing airflow direction

  • The space available for the branch

Contact us

Advice on branching and connecting ducts

All duct fitting guides