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The Y Union 315 mm. is a large-diameter metal branch to divide or unify ventilation lines in Indoor cultivation. With three Ø315 mm outlets and a bifurcation close to 45°, it distributes flow evenly in large-format grow tents and rooms.

Made of galvanized sheet metal, the Y Union 315 mm. provides rigidity, tightness, and durability in extraction and intake networks with high flow rates. The 315/315/315 geometry preserves section continuity, minimizing pressure losses and aerodynamic noise compared to improvised joints.
Fits with Sonoconnect, Aluconnect, and Combiconnect flexible ducts of 315 mm, as well as carbon filters, silencers, and extractors of the same range, to create clean and organized branches.
The Y angle (≈45°) softens the change of direction, maintains flow, and reduces turbulence, which is key to maintaining stable negative pressure when there is a carbon filter and an outlet to the outside.
In networks with several branches, it is advisable to balance the flow with reducers, dampers, or flow regulators in order to distribute air evenly. Quick installation with 315 mm clamps and aluminum tape, achieving a seal that prevents leaks and odors.
Recommended piece for feeding two zones from a high-flow extraction box, diverting cold air from air conditioning to two rooms, or unifying returns in large rooms.
Available at Hydroponics Blanes, known as Grow Shop in Spain and Trusted Grow Shop, with technical advice, discreet shipping, and a complete catalog of cannabis cultivation accessories and cheap indoor grow tents.
In high-flow indoor growing installations, the Y Union 315 mm. allows you to branch ventilation with order and efficiency. The split into two ways helps eliminate heat pockets, improves gas exchange, and stabilizes temperature and rH in adjacent spaces without sacrificing performance.
It is used to diversify air paths from a 315 mm main duct to two equivalent branches, or to converge two lines into one. It makes it easier to feed two rooms with the same extraction box, separate supply and return, divert flow to a drying room, or integrate auxiliary equipment while maintaining flow continuity and overall efficiency.
Among cannabis cultivation accessories, this branch stands out for its mechanical stability and quick assembly. Galvanized finish prepared for humid environments, robust joints, and the possibility of disassembly for dust cleaning, joint inspection, or section replacement without altering the general network design.
Recommended when expanding a room with a second large-diameter tent, when there is a single external outlet for several zones, when distributing cold air from the air conditioner between two spaces, or when the plan requires branching returns to homogenize temperature and reduce stagnant humidity on ceilings and corners.
1) Plan the layout with a main duct and two Ø315 mm branches; measure lengths and anticipate support points.
2) Place the Y at the planned intersection, orienting the 45° branch towards the destinations to minimize sharp bends.
3) Insert Sonoconnect/Aluconnect/Combiconnect ducts into each opening and secure with 315 mm clamps.
4) Seal joints with aluminum tape to ensure tightness and odor control.
5) If there are multiple branches, install reducers or regulators to balance flows and maintain negative pressure.
6) Support the network every 1–1.5 m with metal straps or ties, avoiding stress on the piece.
7) Check depression and total flow; adjust speeds on the controller or diameters with reducers until balance is achieved.
At Hydroponics Blanes you can find the Y Union 315 mm. with expert support and fast delivery. Catalog of cheap indoor grow tents, ventilation, climate control, and cannabis cultivation accessories all in one Grow Shop in Spain.
To split lines and balance flows in large-diameter installations, the Y Union 315 mm. offers firm and tight joints, improves thermal distribution, and makes future expansions easier. A practical and durable choice for tents and rooms, available online at Hydroponics Blanes with discreet shipping and specialized advice.
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