Ducting for Extractors: The Essential Link in Your Indoor Ventilation

Ducting for extractors is the circulatory system of your growing setup. Without it, it's impossible to remove stale air or bring fresh air where your plants need it. Whether you have a small 60x60 grow tent or a grow room spanning several square meters, the choice of your ducting will directly impact the efficiency of your extractor and the health of your crops.

Poorly sized or low-quality ducting is a sure way to lose airflow and create noisy turbulence. Frankly, it's best to stack all the odds in your favor from the start.

Why Choose Ducting Adapted to Your Extractor

The first rule is the diameter: your ducting must exactly match that of your extractor. A 125mm extractor with 100mm ducting is like trying to drink a milkshake with a cocktail straw. You'll create a restriction that will drastically reduce your airflow and increase noise.

The material also matters a lot. Flexible aluminum ducts are perfect for temporary installations or tight corners, but be careful of kinks that reduce airflow. Rigid PVC ducts offer less pressure loss but are more complicated to install in confined spaces.

Thermal insulation is where it changes everything if you're growing in a garage or basement. Insulated ducting prevents condensation that can ruin your electrical equipment and create mold. Not to mention, it also reduces noise by 3 to 5 dB, which is significant.

How to Choose the Right Ducting for Your Extractors

First criterion: measure the outlet diameter of your extractor. 100mm, 125mm, 150mm, 200mm... no compromise possible here. If you need to connect different diameters, use specific reducers rather than forcing it.

For length, keep in mind that one meter of ducting causes about a 5% loss in airflow. Beyond 3 meters, you start to have significant losses. If you need to run a long distance, opt for rigid ducting and avoid 90° bends.

The thickness of the ducting also plays a role. Thin ducting will vibrate and make noise, especially with a powerful extractor. For 125mm, count on at least 0.15mm thickness. Below that, it's cheap stuff that will tear at the first assembly.

If your installation passes through unheated areas, insulation becomes mandatory. A 10°C difference between the inside and outside of the ducting, and you'll have condensation dripping everywhere.

Frequently Asked Questions

What diameter of ducting should I choose for my extractor?

The diameter of your ducting must exactly match that of your extractor, without exception. A 125mm extractor requires 125mm ducting. Using smaller ducting will create a restriction that will drastically reduce airflow and increase noise. Larger ducting will not cause airflow problems but will complicate connections. If you absolutely must change diameter, use specific conical reducers that allow for a gradual transition without creating turbulence.

How do I properly install my ducting to maximize extractor efficiency?

Optimal installation begins with the shortest and straightest path possible. Each bend reduces airflow, so favor wide curves over right angles. Securely fasten the ducting every meter to prevent it from sagging and creating restrictions. Use clamps appropriate for the diameter, not tape that will eventually fail. If you need to pass through a partition, install a passage flange to protect the ducting from friction. Finally, ensure the ducting is neither too taut nor too loose.

What is the maximum length of ducting I can use without losing performance?

As a general rule, limit yourself to a maximum of 3 meters to retain 85% of your extractor's nominal airflow. Each meter of ducting causes about a 5% loss in airflow, and each 90° bend is equivalent to an additional 1 meter. Beyond 5 meters, losses become truly detrimental. If you absolutely must run a long distance, opt for rigid PVC ducting, which generates less pressure loss than flexible ducting, and potentially increase your extractor's power to compensate.

Should I insulate my ducting and why?

Insulation becomes essential if your ducting passes through unheated areas or if the temperature difference between the air being transported and the environment exceeds 10°C. Without insulation, you will have condensation that can damage your electrical equipment and promote mold growth. Insulation also reduces transmission noise by 3 to 5 dB, which is valuable in a residential environment. Insulated ducting also maintains the temperature of the transported air, which is important if you are exhausting warm air in winter.

How do I maintain and clean my ventilation ducting?

Cleaning at least every 6 months is recommended to maintain the efficiency of your system. Disassemble the ducting and first vacuum dust deposits with a vacuum cleaner equipped with a brush attachment. For a more thorough cleaning, use a bottle brush adapted to the diameter of your ducting and soapy water. Rinse thoroughly and let it dry completely before reassembly. Take the opportunity to check the condition of the connections and replace clamps if necessary. Clogged ducting can reduce airflow by 20 to 30%.