Back Draught Shutter

Discover the complete range of ventilation backdraft dampers (terugslagkleppen) at No Mercy Shop, the perfect solution to effectively prevent unwanted backdrafts and outside odors. A backdraft damper (or butterfly valve) is an essential component in any professional ventilation system. The spring-loaded blades open automatically as soon as your inline duct fan turns on and close airtight when extraction stops, keeping cold air, wind, and pests out of your grow room.

Why choose a ventilation backdraft damper?

Maintaining a stable indoor climate is critical for healthy plant development. Without a premium backdraft damper, cold or humid air can flow back into your cultivation space or grow tent through the ducting when the extractor fan is turned off. Additionally, this mechanism prevents the backflow of odors and false air leaks, which is essential for precise climate control and absolute discretion.

Expert advice for installation in your ventilation duct

Our ventilation backdraft dampers are manufactured from durable materials with smoothly pivoting blades that offer minimal airflow resistance. For optimal performance, we recommend placing the backdraft damper between your inline duct fan and the exhaust outlet within the ventilation line. Ensure that your flexible air hoses are pulled tightly over the collars of the damper and sealed securely using heavy-duty hose clamps or aluminum tape.

Key Models and Sizes

Within this category, you will find a wide range of diameters tailored to match all standard extraction and filtration setups in our inventory:

• Ventilation backdraft damper Ø 100 MM – Compact butterfly damper for micro-growing and smaller exhaust ducts.
• Ventilation backdraft damper Ø 125 MM – The most popular size for standard inline duct fans.
• Ventilation backdraft damper Ø 150 MM – Excellent fit for medium-sized ventilation setups.
• Ventilation backdraft damper Ø 160 MM – Widely used diameter for powerful grow cabinet extractors.
• Ventilation backdraft damper Ø 200 MM – Heavy-duty backdraft damper designed for larger air volumes.
• Ventilation backdraft damper Ø 250 MM – Maximum diameter for large-scale and professional air management.