You may not realize a poorly ventilated room may increase heating costs and even cause health issues. Warmer climates like we have here in Australia require ventilation fans since we have more moisture condensation. Moisture condensation from a poorly ventilated room can cause mould spore growth. Mold causes respiratory problems. Exhaust fans also remove odour.

Room and Fan Types

You may need exhaust fans in:

· Toilet room

· Kitchen

· Laundry room

· Shower room

At Coda Electrical, we pride ourselves on quality workmanship and desire all our customers to understand what’s involved in the installation of exhaust fans. Please read on to understand the process, or give us a call to get a quote.

Preparing for Exhaust Fan Installation

The Building Code of Australia (BCA) requires exhaust fans where there is no natural air flow. Fans may be placed in roof or side walls. There are two BCA codes to needed comply: Australian Standard (AS) 36661 “Air-handling and water systems of building – Microbial control”. The BCA also requires you adhere to AS 1668.2 “Mechanical ventilation for acceptable indoor air quality”. This addresses:

· Air flow rate

· Noise level

You need to calculate the volume of air in the room where you are installing the exhaust fan. This helps to calculate the number of air changes in the room per hour. Our flow rate in Australia is required to fall into the range of 50 – 100 L/s (litres per second). The volume of air in the room is determined by the equation:

L x W x H

Where L is the length of the room, W is the room width and H the height.

Installation of Vent Fan

Exhaust Fan Installation consists of these parts and areas of the roof or room.

· Exhaust fan housing

· Through-wall, ceiling or roof

· Ductwork

· HVAC duct tape

· Vent cap

Many types of exhaust fan kits come with all of the parts you need to install the exhaust fan.

Replacing an Exhaust Vent Fan

Follow these steps:

Turn power off to existing vent fan and remove the old cover of the fan. Re-check electricity is turned off. And then remove old fan motor housing.

Take out the mountings and disconnect the vent ducting. Last but not least, disconnect the electrical wires.

Installation of New Exhaust Van

These steps are followed by Coda Electrical in most cases:

Place the new exhaust fan on the ceiling or wall and pencil outline of fan footprint. Saw the sheetrock along footprint mark and attach fan ductwork connector to the side of the ceiling.

Install the exhaust fan motor and housing and go to the attic.

Align vent housing with the roof joists before attaching ductwork to vent fan housing. Seal vent ductwork to vent motor housing with HVAC duct tape and then screw vent fan brackets into joists. The next thing to do is remove electrical junction box from the exhaust fan housing.

Next, connect house electrical wires to the vent fan wires and re-attach electric junction box cover. You should then power exhaust vent fan unit on and check noise level.

If nosier than acceptable, re-check installation ensuring everything is tight and snug.

Lastly, return to the room and attach the vent fan cover. End it all by testing the operation of the fan.


Call now to get your exhaust fan installed by a professional!