Want to stop foggy mirrors, mould, or lingering odours in your bathroom? A properly installed exhaust fan is essential. Whether you’re replacing an old unit or starting fresh, this bathroom exhaust fan installation guide will walk you through the process, key decisions, and expert tips. Plus, you’ll find top-rated fans ready to order from Austpek Bathrooms.

Why Proper Bathroom Exhaust Fan Installation Matters

• Stops Mould & Mildew: Removes excess moisture that can damage walls and ceilings.

• Improves Air Quality: Clears steam and odours for a fresher, more comfortable space.

• Protects Your Investment: Keeps paint, cabinetry, and fixtures in better shape.

• Adds Value: Buyers look for modern, ventilated bathrooms—especially in 2025.

What to Know Before Installing a Bathroom Exhaust Fan

1. Assess Your Bathroom Size and Layout

Measure your space. Small bathrooms may need a basic fan, while larger or ensuites need higher airflow (measured in m³/h).

Expert tip: For most bathrooms with a shower, aim for at least 270 m³/h airflow.

2. Check Your Ceiling Type

Is your ceiling concrete, plasterboard, or suspended? Some exhaust fans are designed for low-profile or slim spaces; others need more clearance.

3. Plan the Ducting Route

Efficient ducting is key - air should vent outside, not into your roof cavity. The shorter and straighter the duct, the better the airflow.

Tip: Flexible ducting can fit around obstacles but keep bends to a minimum.

4. Electrical Safety and Regulations

Wiring must be done to code. In Australia, a licensed electrician is required for any new or replacement exhaust fan wiring.

Step-by-Step: How to Install a Bathroom Exhaust Fan

1. Choose the Right Fan

Pick a fan that suits your bathroom’s size, ceiling depth, and ducting requirements.

Recommended options:

• Ventair Olson 200 LED Fan – Slim, side-ducted, good for standard bathrooms

• Ventair Airbus 3-in-1 Fan – For large rooms needing extra power, heat and light

• Martec Saturn Round Fan – Budget-friendly for small bathrooms or ensuites

2. Mark the Installation Spot

Usually near the shower or bath where steam builds up, and close to a power source.

3. Cut the Ceiling Opening

Follow the fan’s template for a snug fit. Ensure there’s space above the ceiling for ducting and wiring.

4. Mount the Fan

Insert the fan into the opening and secure it per the manufacturer’s instructions.

5. Connect Ducting to the Outlet

Attach flexible or rigid ducting from the fan’s outlet to an exterior vent (roof or wall cap).

6. Wire the Fan (Licensed Electrician Required)

Connect to the existing lighting circuit or a separate switch. Test the fan and light before closing everything up.

7. Seal and Finish

Seal gaps around the fan with fire-resistant sealant. Install the exterior vent cover and tidy up insulation or debris.

Common Mistakes to Avoid in Bathroom Exhaust Fan Installation

• Venting into the roof cavity instead of outside (causes damp and mould)

• Choosing the wrong size fan (too small = poor ventilation)

• Long or kinked duct runs (reduces airflow and efficiency)

• Ignoring electrical safety or DIY wiring (always use a professional)

• Skipping regular cleaning of the fan grille

FAQ: Bathroom Exhaust Fan Installation

How long does installation take?

A professional install usually takes 1–2 hours for a straightforward replacement, longer for new installs with ducting.

Can I install a fan myself?

You can cut the ceiling and fit the fan, but all electrical connections must be done by a licensed electrician.

How much does it cost?

Fan prices at Austpek start around $180; expect total install (fan + electrician) from $400–$700 depending on complexity.

Can I upgrade to a fan with light or heat?

Yes! Many combos offer fan, light, and even heat lamps in one unit - just check the wiring requirements.

Pro Tips for Better Bathroom Ventilation

• Run the fan during showers and for at least 10 minutes after.

• Clean the grille every few months to keep airflow strong.

• For ultimate convenience, look for models with humidity sensors or timers.

• Combine with an exhaust fan + light for a clean, streamlined ceiling.

Ready to upgrade your bathroom?

Browse Austpek Bathrooms’ range of exhaust fans today. Breathe easier, protect your home, and enjoy a bathroom that always feels fresh.