Extractor Fan Guide: Replace, Service and Fix It Yourself

If your kitchen or bathroom smells bad, the extractor fan is probably the first thing to check. A weak or noisy fan can leave steam, cooking odors and mould hanging around. The good news? Most fans are simple metal boxes with a motor, and you can swap them without a heavy‑duty electrician.

Before you start, make sure the power is off at the fuse box. Even if the fan is just a wall‑mounted unit, it still draws electricity, and turning the switch off prevents nasty shocks. Grab a screwdriver, a ladder (or a sturdy stool), and you’re ready to go.

When to Service vs. When to Replace

Regular cleaning keeps a fan running smoothly. Build‑up of grease or dust makes the motor work harder, which can cause a humming noise or lower airflow. If you notice a drop in suction, give the fan a quick clean first: remove the cover, wipe the blades, and vacuum the vent.

But sometimes cleaning isn’t enough. A burnt smell, a motor that won’t start, or rattling that won’t stop even after a clean are signs the fan is beyond repair. In those cases, swapping it out is the smarter move.

Step‑by‑Step DIY Replacement

1. Measure the old unit. Most fans come in standard sizes – 100 mm, 150 mm or 200 mm diameter. Write down the dimensions and the mounting type (screw‑in, clip‑on, or recessed).

2. Buy a matching fan. You can find replacements at any hardware store or online. Look for a model with the same voltage (usually 120 V or 230 V) and airflow rating (measured in m³/h).

3. Remove the old fan. Unscrew the cover, disconnect the wiring (note which wire is live and neutral – a quick photo helps), and pull the unit out of the duct.

4. Fit the new fan. Slide it into the opening, reconnect the wires to the same terminals, and tighten the mounting screws. Make sure the fan sits level; a tilted fan can wobble and wear out faster.

5. Test it. Turn the power back on and switch the fan on. You should hear a steady hum and feel airflow when you place your hand near the vent. If it’s quiet or still rattles, double‑check the wiring and mounting.

6. Seal the edges. Use foil tape or a small amount of silicone around the duct connection to keep air from leaking. This helps the fan stay efficient.

That’s it – most replacements take under an hour if you have the right tools. If you run into a missing wire colour, a broken duct, or you feel unsure at any point, give a professional a call. It’s better to spend a little for safety than to risk a fire.

Keeping your extractor fan clean and checking it twice a year can extend its life. A quick brush‑off and a wipe of the vent will stop most problems before they need a full replacement.

So, next time the kitchen smells like last night’s dinner, you know exactly what to do: check the fan, clean it, and if needed, replace it yourself. It’s cheaper, faster and gives you the satisfaction of fixing something around the house.