Inline, window or wall extractor fan: which fits?
Two bathrooms can need completely different extractor fans, because the deciding factor isn't the room, it's how the air can physically get outside. Wall, window and inline fans each suit a different route. Getting the type right is what makes installation possible and the fan effective, and it's a decision Waveform Electrical Wholesale can help you make.
The right extractor type depends on how the moist air can reach the outside. A wall (axial) fan mounts on an external wall and vents straight through it, simple and effective where the room has a suitable outside wall. A window fan fits into a pane of glazing, useful where there's no convenient external wall but there is a window. An inline fan sits in the ductwork away from the room (often in the loft), pulling air through a duct to an outside terminal; it's powerful, can run quiet at the grille, and is the answer for internal rooms with no external wall or window, or where a longer duct run is needed. Choose by the venting route available, then by the power and noise you need.
Wall (axial) fans
A wall-mounted axial fan is the straightforward option: it sits on an external wall and pushes air directly through it to the outside via a short duct and an external grille. Where a bathroom or utility has a suitable outside wall, it's simple to install and effective over that short run. Axial fans are designed for short ducting; they lose performance over long duct runs, which is where an inline fan takes over.
Window fans
A window fan is fitted into a pane of glazing, venting through the window rather than a wall. It's the solution where there's no convenient external wall to go through but there is a window, common in some bathrooms and older buildings. It needs the right glazing arrangement to fit, and is a practical answer when wall-mounting isn't an option.
Inline fans
- 1 The fan unit sits in the ductwork, away from the room, often in the loft.
- 2 Air is pulled from a ceiling grille through a duct to an external terminal.
- 3 Because the motor is remote, the grille in the room can be quiet.
- 4 Powerful, and suited to longer duct runs and internal rooms with no external wall or window.
Choosing what fits
Start with the route: a suitable external wall points to a wall fan; no wall but a window points to a window fan; an internal room, a longer run, or a want for quiet and power points to an inline fan. Then match the extract rate to the room (see bathroom extractor fans: sizing) and the IP rating to the zone. WEW stocks wall, window and inline extractor fans, ducting and grilles across Meath, see condensation and mould if you're tackling a moisture problem. Install to IS 10101 by a registered electrician.
Frequently Asked Questions
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What is an inline extractor fan?
An inline fan sits in the ductwork away from the room, often in the loft, pulling air from a ceiling grille through a duct to an external terminal. Because the motor is remote, the grille in the room can be quiet, and inline fans are powerful and suited to longer duct runs and internal rooms with no external wall or window. -
Can I fit an extractor fan in a bathroom with no outside wall?
Yes, use an inline fan, which sits in the ductwork (often in the loft) and vents through a duct to an outside terminal, so the room doesn't need its own external wall. A window fan is another option where there's a suitable window but no wall to go through. -
Is a wall or inline extractor fan better?
It depends on the route. A wall (axial) fan is simple and effective where there's a suitable external wall and a short duct. An inline fan is more powerful, quieter at the grille and suited to longer runs or internal rooms, but needs ducting to an external terminal. Choose by the venting route and the power and noise you need.
Source it at WEW
WEW (Waveform Electrical Wholesale) is your electrical wholesaler and lighting expert in Meath, supplying fans, ventilation, EV charging and everything electrical to trade and homeowners. Call in to the counter or the showroom for stock, advice and everything referenced in this guide.