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Coupling 150 mm
The 150 mm coupling joins two 150 mm ventilation ducts. Both ends slide over the connector and clamp down on either side, extending the run with no leak point. In grow ventilation, 150 mm is an in-between diameter: 125 and 160 mm are the common sizes, while 150 mm turns up mainly on certain extraction fans, on air handling units and in building ventilation.
Coupling 150 mm – connector for two ducts of the same size
The 150 mm coupling joins two 150 mm ventilation ducts. Both ends slide over the connector and clamp down on either side, extending the run without introducing a leak point. It is meant for systems built around the 150 mm format, which is less common in grow ventilation than 125 or 160 mm.
Why 150 mm sits awkwardly
Grow rooms mostly run 125 and 160 mm. The 150 mm size falls between the two and shows up mainly on particular fan brands, on air handling units and in building ventilation. The practical consequence is that standard reducers do not automatically fit, so measuring the duct before ordering is worth the minute it takes. If the far end of the run is a standard size, what is needed is not a coupling but a 125 to 150 mm reducer.
Fitting it leak-free
- Push each duct end at least 5 cm onto the coupling
- Clamp both sides with a 60 to 170 mm clamp
- Aluminium ducting of 152 mm fits: it runs slightly wider than nominal and seats snugly
- Check the joint with the fan running by passing a hand along the seam
A leaking joint costs airflow without any obvious symptom, which is why that check is worth doing rather than assuming. Shipped from Belgium throughout the Benelux; ducting, clamps and reducers sit in the same catalogue category at plantandflower.be.
Does a 152 mm duct fit a 150 mm coupling?
Yes. Flexible aluminium ducting runs slightly wider than its nominal size, so a 152 mm duct slides over a 150 mm coupling. The small difference works in your favour: the fit stays snug without forcing. Clamp both sides afterwards rather than relying on friction alone.
What if the other duct is 160 mm?
Then a reducer is required, not a coupling. A coupling joins two identical diameters; two different diameters call for a 150 to 160 mm reducer. Never force a 160 mm duct over a 150 mm coupling: the seal will not hold and the clamp has nothing solid to bite against.
How many clamps are needed?
Two, one per side. A 60 to 170 mm clamp covers the range comfortably and leaves enough travel to pull in the folds of flexible ducting. Clamps are not usually supplied with the coupling, so add them to the order unless there are already some on the shelf.