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Soundproofing Box.

Soundproof boxes for extractor fans: silence without airflow loss

The constant humming of a running extractor fan becomes especially disruptive at night — and low frequencies pass easily through walls and floors. A soundproof box tackles this by enclosing your fan in an acoustic casing that absorbs both motor noise and mechanical vibrations. Noise reduction reaches 40 to 50 percent, with airflow capacity fully preserved through optimised connections.

Available in three diameters: 125 mm for compact grow tents, 150 mm for mid-sized setups and 200 mm for larger grow rooms. The noise-dampening sleeves on the connection points prevent vibrations from transferring to your ducting. Fast delivery across Belgium.

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Soundproofing Box 125mm phonic foam 30.5cm kit complete | Soundproofing Box

Soundproof Casing 125 mm

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Soundproofing Box 200mm kit 30.5cm cube assembled photo | Soundproofing Box

Soundproof Casing 200 mm

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Soundproof boxes for extractor fans: our range

A soundproof box is the most effective solution for drastically cutting the noise from your extractor fan without sacrificing capacity. The principle is simple: your fan sits inside a sturdy outer casing lined with high-quality acoustic insulation, so motor noise and vibrations are absorbed before reaching the surface. Air intake and exhaust run through connections fitted with noise-dampening sleeves, keeping the airflow smooth.

How a soundproof box works

The effectiveness of a soundproof box rests on two complementary principles. First: mass. A heavy, rigid outer wall prevents sound waves from breaking through the material — what acousticians call the "mass law". Second: absorption. The inside is lined with open-cell foam or polyester fibre that converts sound waves into heat as they reflect. The combination dampens the full frequency range, with particular attention to the low-frequency hum (50-300 Hz) that conventional solutions like insulated ducting struggle to stop. Those low frequencies travel as vibrations through solid materials — walls, floors, ceilings — and are often the main cause of neighbour complaints.

Two sizes matched to your installation

Choose a soundproof box that matches the diameter of your extractor fan:

Soundproof box 125 mm — for smaller grow tents (80×80 to 100×100 cm) with fans up to 250 m³/h
Soundproof box 200 mm — for larger spaces and powerful fans up to 800 m³/h

The box diameter must match your extractor fan outlet exactly. A wrong size creates air leakage at the connection points — precisely where noise also escapes. Always check the specifications of your fan and matching carbon filter before ordering.

A small loss for a big gain

A correctly sized soundproof box has only 5 to 10 percent impact on airflow — a negligible difference that is barely noticeable in practice. The optimised connections and spacious interior let the fan breathe freely. In return, you gain an acoustic difference you actually notice: from an irritating hum to a quiet background sound that disappears the moment you close the tent. The investment pays off especially in nighttime quiet, a decisive factor if your grow space is inside your living area or if you want to maintain good relations with your neighbours.

Combining for maximum reduction

For absolute silence, combine the box with complementary solutions. Place silencers (flexible sound absorbers) in the ducting between filter and fan to eliminate resonance inside the circuit. Use insulated Sono-Connect ducting rather than standard aluminium for the remaining run — this dampens noise travelling through the tubes by another 8-12 dB. Place a vibration damper or rubber mat underneath the box to prevent structure-borne vibrations. Finally, secure all connections with hose clamps — every loose connection is an extra noise path. With this combined approach, you achieve a virtually silent installation.

FAQ - Frequently asked questions about soundproof boxes

How much noise does a soundproof box actually reduce?

Typically 40-50% in subjective perception, or 8-12 dB on a sound meter. That might sound modest, but human hearing experiences every 10 dB reduction as a halving of volume. The exact reduction depends on fan type, speed setting and installation quality. For optimal results, combine the box with insulated ducting and flexible silencers.

Which size soundproof box for my fan?

The box diameter must match your extractor fan outlet exactly. For smaller fans (up to 250 m³/h) take 125 mm, for medium-sized 150 mm, and for powerful fans (up to 800 m³/h) 200 mm. Check your fan specifications before ordering — a box too small will not fit the fan, a box too large creates air leakage at the connections.

Does the box reduce my airflow?

Minimally, typically 5-10%. That is far less than what you gain in noise reduction. The optimised connections and spacious interior let the fan breathe freely. In practice this loss is barely noticeable in system performance.

Does every fan fit inside a soundproof box?

Soundproof boxes are designed for centrifugal fans and UFO extractors of standard diameter (125/150/200 mm). Check your fan dimensions (length including flanges) and compare with the box interior. There must be enough space around the fan for unobstructed air circulation — avoid a tight fit.

How do I install a soundproof box?

Place the fan inside the box on the built-in support or rubber mat. Connect the inlet and outlet to your ducting using duct couplings and secure with hose clamps. Position the box on a stable surface, preferably on vibration dampers or rubber mats to prevent structure-borne noise. Leave 5-10 cm of free space around the box for heat dissipation.

Order your soundproof box today at Plant & Flower. Fast, discreet delivery anywhere in Belgium.