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The 250 mm Y Union is a metal branch for dividing or unifying ventilation routes in Indoor cultivation. Three Ø250 mm outlets with a 45° bifurcation distribute airflow evenly in cabinets and rooms with multiple air destinations.

Made of galvanized sheet metal, the 250 mm Y-Union provides rigidity, tightness, and long service life in large-diameter extraction and intake networks. The 250/250/250 geometry maintains section continuity, minimizes pressure loss, and reduces aerodynamic noise compared to improvised joints.
Fits 250 mm flexible ducts Sonoconnect, Aluconnect, and Combiconnect, as well as carbon filters, silencers, and extractors of the same range, creating clean and orderly branches.
The 45° angle softens the change of direction, maintains flow, and lowers turbulence, which is key to maintaining stable negative pressure when there is a carbon filter and 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 between zones.
Installation is quick with 250 mm clamps and aluminum tape, achieving a seal that prevents leaks and odors.
Recommended for feeding two grow tents from one extraction box, diverting cool air from an air conditioner to two rooms, or unifying returns in medium and large rooms.
Available at Hydroponics Blanes, a benchmark as a 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 indoor cultivation installations with several rooms or high-flow tents, the 250 mm Y-Union allows you to branch ventilation with order and efficiency. The split into two paths helps eliminate heat pockets, improves gas exchange, and stabilizes temperature and rH in adjacent spaces.
It is used to diversify air routes from a 250 mm main duct to two equivalent branches, or to converge two lines into one. It makes it easy 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 system efficiency.
Among cannabis cultivation accessories, this branch stands out for its mechanical stability and quick assembly. Galvanized finish prepared for humid environments, solid 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 250 mm tent, when there is only one external outlet for several zones, when distributing cool air from the air conditioner between two spaces, or when the layout requires branching returns to homogenize temperature and reduce stagnant humidity on ceilings and corners.
1) Plan the layout with a main duct and two Ø250 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 250 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 250 mm Y-Union 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 250 mm Y-Union provides strong, tight joints, improves thermal distribution, and facilitates future expansions. A practical and durable choice for tents and rooms, available online at Hydroponics Blanes with discreet shipping and specialized advice.