Fan Installation Made Simple: What You Need to Know

Want fresh air in the kitchen or a quieter bathroom? Installing a fan yourself can save money and get the job done fast. In this guide we cover the basics – from choosing the right fan to wiring it safely and keeping it in good shape.

Pick the Right Fan for the Job

First, decide where the fan will live. Kitchen extractor fans need enough power to pull cooking steam away, while bathroom fans focus on humidity and odor. Look at the fan’s CFM (cubic feet per minute) rating – higher numbers move more air. A 100‑150 CFM fan works for most sinks, and 150‑200 CFM handles a standard range hood.

Also check the size of the opening. Most fans come in 120 mm (4‑inch) or 150 mm (6‑inch) ducts. Match the duct size to the opening to avoid air leaks. If you’re replacing an old fan, note the exact model or measure the cut‑out; you can reuse the mounting brackets in many cases.

Step‑by‑Step Installation

1. Turn off power. Go to the consumer unit and switch off the circuit that feeds the fan. Use a tester to confirm there’s no voltage.

2. Remove the old fan. Unscrew the cover, disconnect the wires, and detach the mounting clips. Keep the screws – you’ll need them for the new unit.

3. Prepare the opening. Clean any debris and check the cut‑out is square. If the new fan is larger, you may need to enlarge the hole with a jigsaw or hole‑saw. Seal gaps with foil‑taped ducting.

4. Wire the new fan. Most fans use a simple live, neutral, and earth connection. Connect live (brown) to live, neutral (blue) to neutral, and earth (green/yellow) to the earth screw. Tighten each terminal and double‑check the wiring diagram that comes with the fan.

5. Mount the fan. Slide the fan into the opening and secure it with the provided brackets or screws. Make sure it sits flush – gaps cause noise and reduce efficiency.

6. Attach the duct. Connect the duct to the fan’s outlet, clamp it tightly, and run it to the external vent or attic vent. Keep the duct as straight as possible; bends add resistance.

7. Test it. Restore power and turn the fan on. You should hear a steady hum and feel airflow at the vent. If it’s noisy or not moving air, re‑check the duct seal and wiring.

That’s it – most fan installations finish in under an hour with basic tools.

Now that the fan is up and running, regular maintenance keeps it efficient. Clean the blade and motor housing every few months with a soft brush and a mild detergent. Check the vent grille for dust buildup, especially in kitchen fans where grease can clog the system.

If the fan starts to hum loudly or the airflow drops, it may be time to service the motor or replace the fan altogether. Many homeowners find it easy to replace the whole unit; the steps above work for a fresh install too.

Remember, safety first – if you’re unsure about any electrical work, call a qualified electrician. A well‑installed fan not only improves air quality but also helps prevent mold and reduces cooking odors.