Devola DVILF100T 100mm Inline Mixed Flow Extractor Fan with Timer (4 inch) – made in Britain
Product description
The essentials
If you want extraction that keeps working even after you’ve left the room, the Devola DVILF100T is built around a simple idea: mix-flow duct extraction plus an adjustable timer. On paper, it’s aimed at bathrooms (and similar moisture-prone spaces) where you don’t just need a quick boost, but a follow-on run to help clear humidity.
This is a 100mm inline mixed flow extractor fan designed for use through ducting. It’s the sort of unit people choose when they’re fitting or upgrading ventilation for a bathroom, kitchen run, or even a loft setup. The “timer model” matters here: the fan can be set to continue for a period after you switch it off.
What it’s for (and where it fits)
Mixed flow extractor fans are often chosen for ducted installations where you need reasonable airflow without going overboard on noise. This one is specified with an airflow rate of 187 m³/h, and it’s described as being designed for higher operating pressures than you might get from simpler setups. That’s useful if your duct run isn’t perfectly straight, or if you’re working with flexible ducting.
A practical way to think about it: imagine you shower, turn the extractor off when you leave, and the room doesn’t immediately dry out. The timer function is there to keep the airflow going for 2–30 minutes after switching off, so the fan isn’t relying solely on your “in the room” time.
Key takeaways on performance and noise
Noise is a big deal with bathroom ventilation, especially if you’re sensitive to background hum. The DVILF100T is rated at 27 dB, which is notably quiet for an extractor fan and, in everyday terms, means it’s less likely to become an annoyance during use.
You’ll also notice the timer control is adjustable between 2 and 30 minutes. That gives you room to match the run-on time to how long the room needs to recover—shorter for quick steam, longer after heavier moisture.
The build, protection and install-friendly details
Devola states the fan is made from low-flammability polypropylene. It’s also described as IPX4, which is a relevant protection level for areas where splashes can occur (typical of bathroom environments).
On the install side, this is a 100mm duct inline unit. It’s described as compatible with standard 100mm ductwork, whether rigid or flexible. There’s also a removable central section intended to make cleaning easier—handy because extractor fans are only as good as their ability to stay clear over time.
One more point worth noting: it’s stated as compatible with Building Regulations Parts F and L. If your project is part of a regulated setup, having that compatibility call-out can reduce uncertainty when you’re planning your ventilation strategy.
Specs that actually affect buying decisions
- Airflow: 187 m³/h
- Duct size: 100mm
- Timer range: 2–30 minutes after switching off
- Noise level: 27 dB
- IP rating: IPX4
- Materials: low-flammability polypropylene
- Dimensions: 190 mm high x 167 mm wide x 246 mm long
- Spigot: 96 mm
- Warranty: 5 years
It’s also made in Britain, and the manufacturer mentions a German motor. That blend (British craft with a German motor) is the kind of detail that suggests the emphasis is on reliability rather than gimmicks. Still, remember: “quiet” and “high airflow” can be influenced by ducting quality, length, bends and how well the system is set up.
What to look out for before you buy
This fan is specified for 100mm ducting, so it’s only a smooth match if your planned duct size is aligned. If you’re currently on a different diameter, you may need an adaptation strategy, and that can complicate things.
Also, while the timer is adjustable, it won’t replace a properly designed extraction setup. If your room has particularly demanding ventilation needs, or if the duct run is poorly planned, you might find the real-world results don’t reach the expectations implied by airflow figures.
Mini FAQ
Is this fan suitable for a bathroom?
It’s positioned for bathroom use (and similar moisture-prone spaces) with IPX4 protection and a timer designed to run on after switching off.
How does the timer work?
You can set it to continue operating for 2–30 minutes after you turn the fan off, which is intended to help clear humidity after you leave.
Can it use rigid and flexible ducting?
The fan is described as compatible with both rigid and flexible 100mm ductwork, which helps if your installation route isn’t straightforward.
Is it quiet enough for day-to-day use?
At 27 dB (as specified), it’s aimed at being ultra-quiet during normal operation, though any ventilation system can get louder depending on ducting and installation.
Is it worth it?
Worth considering if you want a ducted 100mm inline mixed flow extractor with a run-on timer for bathrooms, kitchens or loft-style ventilation, and you care about keeping noise down. The combination of a 2–30 minute timer, IPX4 protection and a removable section for easier cleaning makes it feel practical for long-term use.
You may want to skip it if your project doesn’t suit 100mm ducting, or if you’re expecting it to compensate for an underperforming ventilation design. In other words, it’s a solid “right category” choice for humidity control via duct extraction, but it still needs the rest of the system to be sensible—duct route, sealing and airflow path matter.