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Clamp

Duct clamps for airtight ventilation connections

Motor vibration and the negative pressure your extractor creates gradually work ducting loose from fan and filter outlets. Without hose clamps you lose airflow, let unfiltered odour escape, and force your fan to work harder — with more noise and accelerated motor wear as a result.

Our four sizes of metal duct clamps cover a clamping range from 60 to 370 mm, fitting all common ventilation ducting from 100 to 315 mm — including thicker-walled insulated Sono-Connect variants. Worm-drive mechanism for infinite reusability and even pressure distribution. A few euros in clamps prevents every leakage problem. Fast delivery throughout Belgium.

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Clamp 60/135 mm

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Clamp 60/170 mm

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Clamp 60/270 mm

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Clamp 60/370 mm

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Duct clamps for your grow room ventilation

Every unsecured joint in your ventilation circuit is a potential leakage point for both air and odour. Duct clamps lock your ventilation ducting firmly onto the outlets of your extractor fan, carbon filter and grow tent ports. The result is a hermetically sealed extraction circuit where all air passes through the filter — the baseline requirement for effective odour control.

Why clamps are non-negotiable in any extraction setup

The physics is straightforward: your fan creates negative pressure in the ventilation circuit, and that pressure constantly seeks to equalise through any available leak. Without clamps at the connection points, microscopic gaps form within days between duct and spigot, then widen under motor vibration. Consequences: up to 30% airflow loss, detectable odour in adjacent rooms, and a fan forced to overwork to compensate. In continuous-use cultivation, this shortens motor life by several years. A set of clamps for a few euros eliminates all these problems — it is the cheapest upgrade you can make to your entire grow space.

Worm-drive design: the professional standard

Our clamps use the worm-drive mechanism (also known as a Jubilee clip): a flexible metal band with diagonal slots engaged by a turning screw. As you tighten the screw, the band draws uniformly tight around the duct, whatever the exact diameter within the clamp's range. This construction has three advantages over spring clamps or metal hose straps: pressure distributes evenly around the entire circumference (no pinch points that damage the ducting), the range accommodates different wall thicknesses (useful for insulated ducting), and they are essentially infinitely reusable — unbolt, reposition, re-tighten without quality loss.

Which clamp for which duct?

Each model covers a diameter range rather than a single fixed size, letting one clamp work across multiple duct formats. Four sizes span the entire ventilation range:

60-135 mm clamp — for standard Alu-Dec 100 mm and 125 mm ducting (the most common hobby size)
60-170 mm clamp — fits 125-160 mm ducts including insulated Sono-Connect 127 mm
60-270 mm clamp — for larger extractors with 200-250 mm outlets
60-370 mm clamp — professional installations running 315 mm ducting

When in doubt between two sizes, always pick the larger one. A slightly oversized clamp tightens down to the correct diameter without issue, whereas an undersized clamp simply fails to close and serves no purpose. For insulated ducting, account for the outer diameter including the insulation layer — typically 10 to 15 mm larger than the inner bore.

Installation in three steps

Installation is simple but requires discipline. Step one: push the duct fully onto the fan or filter spigot, all the way to the stop collar. Do not settle for halfway — every millimetre short compromises the seal. Step two: position the clamp roughly two centimetres from the duct edge and tighten the screw with a flat-head screwdriver or socket driver. Correct tension feels right: the duct no longer moves under moderate twisting, but does not visibly pinch inwards. Step three: test the seal by running your palm along the joint while the system runs — no air flow should be perceptible escaping.

Extra sealing for critical connection points

For connections where odour escape must be absolutely prevented — particularly the carbon filter outlet and the port between your grow tent and extraction zone — a clamp alone may not be enough. Best practice: wrap a layer of professional-grade aluminium tape around the duct before positioning the clamp. The tape fills microscopic pores in the duct wall that develop after multiple installation cycles. Replace clamps showing visible rust, band deformation or thread wear — at their price, preventive replacement during annual maintenance is a reasonable investment. Check existing clamps monthly by giving them a quarter-turn tighten: metals expand and contract with temperature variation, and a small retightening restores the original seal.

FAQ - Frequently asked questions about duct clamps

Which duct clamp fits 125 mm ventilation ducting?

The 60-135 mm clamp works for standard thin-walled 125 mm ducting (Alu-Dec). For insulated Sono-Connect 127 mm, step up to the 60-170 mm model so the band comfortably wraps the thicker insulation layer without being stretched to its limit.

How tight should a duct clamp be?

Tight enough that the duct cannot slide under moderate hand torsion, but not so tight it visibly pinches inwards. An over-tightened clamp eventually cuts through the aluminium layers — you will see a circular indentation on the duct. The wide band distributes pressure evenly, so excessive tightening brings no sealing benefit.

Are duct clamps reusable after removal?

Yes. A worm-drive clamp treated correctly lasts years — unbolt, reposition and re-tighten without quality loss. Replace only when you see visible rust, a screw with worn threads, or a broken band. Given the low price, preventive replacement during annual maintenance is still a wise choice.

Do I need clamps at both ends of every duct?

Yes. Every duct has two connection points and both are potential leak sources. In a basic fan → duct → filter layout, that means a minimum of two clamps. For installations with intermediate couplers or ventilation systems with multiple branches, count one clamp per connection point.

Can I use these clamps for applications other than ventilation?

Absolutely. Our worm-drive clamps work on any flexible hose or tube within their clamping range: irrigation systems with larger-diameter hoses, CO2 distribution lines, drainage hoses from dehumidifiers and humidifiers. The principle is identical — anywhere air or liquid passes through a connection under pressure or negative pressure, a clamp ensures a leak-free seal.

Order your duct clamps today at Plant & Flower and keep your extraction system perfectly sealed. Fast, discreet delivery anywhere in Belgium.