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Enter your room measurements for an estimated heating requirement. Compare radiators without leaving this page.

Starting assumptions: two adjacent outside walls, 1.5m² low-E glazing, insulated cavity walls, ground floor and insulated loft. Check these against your room.

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U-values describe heat passing through a surface; use known building values where available. −3°C outdoors, 10°C below and the default U-values are preliminary assumptions, not a location survey. Unheated lofts use the outdoor temperature; heated floors/ceilings use U 1.36/1.62 and the adjacent-room temperature.

Preliminary rectangular-room estimate, not an installer’s heat-loss survey. It excludes detailed thermal bridging, ground/loft modelling and ventilation-system design. Confirm the room heat loss and radiator output at your heating-system temperatures before ordering.

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Bathroom Extractor Fans

Choose a bathroom extractor fan that fits your duct and delivers the airflow your room needs. Both black models use a humidity sensor and a run-on timer. The 100 mm fan fits 4-inch ducting, while the 150 mm model fits 6-inch ducting and has a listed airflow of 255 m³/h.

Prices include VAT1-year accessory warranty


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100mm bathroom extractor fan with humidity sensor and timer 100mm bathroom extractor fan with humidity sensor and timer
100mm bathroom extractor fan with humidity sensor and timer

100 mm duct · Humidity sensor and timer · Black

Replacing a fan on a 100 mm duct? Choose a black or white fascia and use the run-on timer to keep extracting after the fan is switched off at its trigger.Product details100mm / 4-inch duct connectionBuilt-in humidity sensor and run-on timerIP44 ratingWall or ceiling mounting subject to the installation requirementsCheck before orderingAsk a qualif..
£29.99
Ex Tax:£24.99
Question
150mm Matt Black Bathroom Extractor Fan with Humidistat & Timer (255m³/h) 150mm Matt Black Bathroom Extractor Fan with Humidistat & Timer (255m³/h)

150mm Matt Black Bathroom Extractor Fan with Humidistat & Timer (255m³/h)

150 mm duct · Humidity sensor and timer · Black

The WW-150QTH fits a 150 mm duct and has a matt black fascia. Its humidistat responds to moisture and its adjustable timer provides 1–30 minutes of run-on. The listed airflow is 255 m³/h. Ask your installer to check what the fan can deliver through your duct route.Product detailsModel WW-150QTHListed airflow: 255m³/h150mm / 6-inch duct sizeHumidity sensor and 1–30 minute run-on timerListed motor power: 21W; noise level: 35dBIPX4 sp..
£41.99
Ex Tax:£34.99
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Showing 1 to 2 of 2 (1 Pages)

Related bathroom extractor fan guides

Check the duct, airflow and controls before choosing.

Bathroom extractor fan buying guide

Check the duct route, airflow and electrical location.

Read guide

Timer or humidity sensor?

Compare how each type starts and stops.

Read guide

100 mm or 150 mm bathroom fan?

Check which duct connection fits.

Read guide

Why is my bathroom fan dripping water?

Check clues that point to duct condensation, rain or a leak.

Read guide

Bathroom fan airflow

Compare airflow ratings in L/s and m³/h.

Read guide

Ducting and placement

Plan the route from the bathroom to the outdoor outlet.

Read guide

Choosing a quiet bathroom fan

Compare noise ratings and check what can make an installed fan louder.

Read guide

The black 100 mm fan has a humidity sensor and timer and is rated IP44. The matt black WW-150QTH uses a 150 mm duct and combines a humidistat with a timer. It is rated IPX4 and has a listed airflow of 255 m³/h. Ask your installer to confirm the required extract rate and the airflow the fan can deliver through your duct. For projects in England, see Approved Document F and check which edition applies.

Compare the 100 mm and 150 mm bathroom fans
Specification100 mm fan150 mm WW-150QTH
Duct diameter100 mm / 4-inch150 mm / 6-inch
Typical fitExisting 100 mm duct, subject to airflow requirements150 mm duct where the installation needs greater airflow
Listed airflow105 m³/h255 m³/h
ControlsHumidity sensor and run-on timerHumidistat and adjustable 1–30 minute run-on timer
IP ratingIP44IPX4
Listed noise34 dB35 dB
Listed motor power12 W21 W
Front panel (width × height)150 × 150 mm193 × 193 mm
Rear housing depth (dimension C)90 mm100 mm
Front section depth (dimension D)35 mm35 mm

Dimensions and performance figures are from the manual. It lists 110–120 V at 60 Hz and 220–240 V at 50/60 Hz as supply variants. Confirm the ratings for your unit on its nameplate.

For the humidity-sensor version, the manual lists an adjustable threshold of 60–90% relative humidity and a 1–30 minute run-on timer. The fan starts when humidity rises above the threshold and begins its timed run-on after humidity falls below it.

For electrical work in England, see Approved Document P. Ask a qualified electrician to check the proposed fan location against the bathroom zones in BS 7671 and the installation instructions.

Check the duct route, mounting dimensions and required extraction performance with your installer. A larger duct size is not a substitute for checking the ventilation requirements of the room.

Review the product’s electrical and bathroom-location requirements before ordering. Have a qualified electrician confirm suitability and installation. Bathroom fans have a 1-year accessory warranty.

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