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Quietline Range

Vents Quietline Series: Axial duct fans


Small axial-flow duct fans, available in three nominal sizes Ø 100 mm, Ø 125 mm, Ø 150 mm


If you’re looking to move a lot of air quietly through short duct runs, axial duct fans are the sensible, low‑maintenance choice. Our Quietline range focuses on what matters on site: strong, usable airflow, low sound levels and fittings that go in fast and stay reliable. A robust plastic housing, carefully profiled impellers and an outlet fitted with flow straighteners work together to cut turbulence, increase working pressure and keep the acoustic footprint down. In practice, that means fogged mirrors clear faster, cooking odours disperse sooner and humidity spikes after showers don't linger.


Options

Quietline: Single-speed motor

Quietline-k: Single-speed motor, small mounting bracket for plain surfaces

The range drops straight into standard 100, 125 and 150 mm ducting. Push the unit into the run, secure it with hose clamps and wire it up – that's the installation done. Depending on the orientation in the system, the fan can supply fresh air or extract stale, humid air. Where the network has a little more resistance – think longer flexible ducts, multiple bends or an exterior grille – two units can be mounted in series to gain extra pressure capability with minimal fuss.


Inside sits a single‑speed, ball‑bearing motor designed for low energy draw and long life. Integrated thermal protection guards the motor against overload, while rubber anti‑vibration connectors isolate it from the housing, reducing resonance and extending service life. Rated to IPX4, the fans are splash‑proof and therefore at home in bathrooms, shower rooms and other moisture‑prone spaces.


The Quietline‑k variant includes a neat mounting bracket that fixes securely to flat walls and ceilings, whether horizontal or vertical. This helps when space is tight, the duct route is awkward or a surface‑mounted installation is preferred. Both versions keep a clean, modern appearance that blends easily with most interiors, so you get performance without visual clutter.


Control strategies are flexible. Use permanent background ventilation for small, frequently occupied wet rooms to keep relative humidity in check and mould at bay. Or run the fan intermittently via a wall switch, timer or humidity sensor (depending on your chosen control) to tackle peaks after showers or cooking. Either way, directing the airflow through the duct means the air changes happen where they should, with minimal draught in occupied zones.

Aerodynamics matter. The impeller geometry favours high volume at modest static pressure, perfect for short, low‑resistance duct runs found in most domestic and light‑commercial jobs. The outlet flow straighteners reduce swirl, producing a more coherent jet that carries further and handles minor restrictions better. Less turbulence also equals less broadband noise – the kind that makes a fan seem “busy” even when the measured dB figure looks fine.


Maintenance is straightforward. The durable plastic casing won't corrode and wipes clean easily. A light dusting of the impeller from time to time preserves balance and keeps the sound signature smooth. Factory‑lubricated ball bearings and a simple electrical layout mean there’s little to worry about, and the thermal cut‑out offers a safety backstop if conditions briefly exceed the design envelope.

Sizing is simple when you consider three things: room volume, moisture/odour load and duct path. Windowless bathrooms and shower rooms typically need higher air change rates; small cloakrooms or pantries often manage with a compact 100 mm unit. If the route is longer or includes several changes of direction, stepping up to 125 or 150 mm can reduce pressure losses and keep noise down. Where upsizing isn't possible, series mounting gives you the extra push you need.

Energy efficiency in the real world is about delivering the target airflow at the lowest practical speed. A fan that meets demand without racing is quieter and usually draws less power over the year. This is where Quietline shines: solid airflow at low sound and sensible wattage under everyday conditions. The payoff is better indoor air quality, quicker clearance of humidity and odours, and a home or workplace that feels fresher without the fan calling attention to itself.


The upshot for installers and end‑users alike is a "fit‑and‑forget" solution: push‑fit, wire, clamp, and the fan quietly does its job in the background. Opt for matching interior grilles or exterior louvres for a tidy finish, and keep ducts as short and smooth as the layout allows for best results.
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