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Reducer, 125/100-400/315mm – connect different ventilation duct sizes with ease

This ventilation reducer provides a straightforward way to connect pipes and ducting with different diameters. Designed for intake and extraction systems in grow tents, grow rooms and other ventilation installations, it allows you to adapt existing ductwork or integrate components with different connection sizes. Whether you are building a new extraction system or modifying an existing setup, the reducer provides a practical transition between two duct diameters.

Adapt your ventilation system to different connections

Extractor fans, activated carbon filters and ventilation ducts do not always have matching connection diameters. A suitably sized reducer allows you to join components with different openings without replacing the entire ventilation system.

It can be used for both new installations and modifications to existing ductwork. If you need additional connectors or components to configure your airflow system, explore our range of ventilation duct fittings.

13 size combinations for different duct diameters

The reducer comes in 13 size combinations, covering connection diameters from 100 to 400 mm. This range allows you to select the appropriate transition for your existing ductwork or ventilation equipment.

For example, the 125/100 mm version joins a 125 mm connection to a 100 mm connection. When choosing a size, check that both diameters match the components you intend to connect. Keep in mind that reducing the duct diameter can increase airflow resistance.

Connecting extractor fans and carbon filters

The reducer can also be used to connect directly to an extractor fan or activated carbon filter when combined with an additional connecting sleeve or suitably sized fast clamp.

For extending the ductwork, you can combine the reducer with compatible flexible ventilation ducting. Ensure that connections are securely fastened and keep duct runs as short and unobstructed as possible to minimise unnecessary airflow resistance.

Technical details:

• Product type: Ventilation duct reducer
• Application: Intake and extraction systems, grow tents and grow rooms
• Function: Connecting ventilation ducts with different diameters
• Available sizes: 125/100, 150/125, 160/100, 160/125, 200/125, 200/160, 250/125, 250/160, 250/200, 315/160, 315/200, 315/250 and 400/315 mm
• Connection diameters: 100, 125, 150, 160, 200, 250, 315 and 400 mm
• Fan and carbon filter connection: Possible with an additional connecting sleeve
• Package contents: 1 ventilation reducer in the selected size

Sold and shipped by Growmart (Hamburg, Germany), which delivers across Europe with DHL. Prices are set by the vendor and you complete your purchase on their site.