


SALE PROHIBITED TO PERSONS UNDER 18 - FREE SHIPPING FROM €40 (Mainland Spain only - Max. 25 Kg)
The 400-250 mm Metal Reducing Coupling is a galvanized steel adapter designed to connect pipes, filters, and extractors of different diameters. This accessory allows for efficient and stable airflow in indoor growing ventilation systems.

The 400-250 mm Metal Reducing Coupling is an essential component for those who need to adapt ventilation equipment with different dimensions. Often, extractor fans have a smaller opening than ventilation ducts or activated carbon filters, leading to incompatibilities.
This reducer solves that problem by allowing you to connect a 400mm duct to a 250mm extractor or filter. Made of galvanized steel , it offers great resistance to humidity, corrosion, and prolonged use, making it an indispensable accessory for cannabis cultivation .
Its use guarantees more efficient and safe ventilation, allowing a stable climate inside cheap indoor grow tents or professional rooms.
At Hydroponics Blanes , Grow Shop in Spain , it is available with discreet shipping and fast delivery in 24/48 hours.
An indoor growing system relies on proper ventilation to control factors such as humidity, heat, and odors. The 400-250 mm Metal Reducing Coupling allows you to adapt carbon filters, flexible ducting, and exhaust fans of different sizes, resulting in a stable and efficient installation. With this accessory, the equipment works in a coordinated manner, improving air circulation within any grow space.
The 400-250 mm Metal Reducing Coupling is used to connect ventilation components with different diameters. For example, it can be used to connect a 400 mm carbon filter to a 250 mm extractor fan, preventing air leaks and pressure loss. This ensures a constant and efficient airflow, essential in budget-friendly indoor grow tents and larger grow rooms.
This indoor growing accessory stands out for its utility and durability. It allows for the adaptation of existing equipment without the need to purchase new parts, resulting in savings on ventilation system installation. Furthermore, its metal construction ensures long-lasting use under demanding conditions, making it one of the most practical cannabis growing accessories for maintaining efficient ventilation.
The 400-250 mm Metal Reducing Coupling is used to adapt larger diameter ducts and filters to smaller extractors. It can also be used in domestic and industrial air conditioning systems, although its most widespread use is in indoor growing . Thanks to this accessory, growers can ensure proper air circulation, preventing heat buildup, excess humidity, and unwanted odors.
Installing the 400-250 mm Metal Reducing Coupling is simple. The 250 mm end is placed on the corresponding extractor or duct, and the 400 mm end is connected to the filter or duct. For a secure fit, it is recommended to use metal clamps to ensure a tight connection and prevent air leaks. This quick assembly allows for a firm and efficient connection without the need for specialized tools.
The 400-250 mm Metal Reducing Coupling can be purchased at Hydroponics Blanes , a trusted Grow Shop that offers discreet shipping throughout Spain and Europe. In addition to this reducer, this Grow Shop in Spain also carries fertilizers, LED lighting kits, extractors, carbon filters, and affordable indoor grow tents , all backed by the guarantee of specialists in cannabis cultivation accessories .
The 400-250 mm Metal Reducing Coupling is a durable and practical metal adapter that simplifies the connection between pipes, filters, and extractors of different sizes. Its durability and ease of installation make it an essential accessory for maintaining ventilation in indoor growing systems, providing safety, efficiency, and stability in every setup.
Customers who bought this product also bought: