This is a genuine Bonaire Combustion Assembly Fan Kit (CTSPS5440801SP) for MB3 and MB4 series ducted gas heaters. It's a critical replacement part for keeping the furnace running safely and efficiently, especially when you're doing a routine service or troubleshooting a combustion issue. Anyone who's swapped one of these out on a freezing winter morning knows the importance of having the right part on hand to get a homeowner's heating back online fast.

This fan kit is essential for maintaining proper airflow through the heat exchanger, ensuring complete combustion and safe flue gas exhaust, which is crucial for the safety and efficiency of any ducted gas heating system.

Best For

• HVAC Technicians and Gas Fitters
• Residential Heating Service and Maintenance Teams
• Apprentice Refrigeration Mechanics (under supervision for gas work)
• Competent DIY owners maintaining their own Bonaire ducted heaters (gas work excluded)

Compatibility

This Bonaire Combustion Assembly Fan Kit (CTSPS5440801SP) is designed as a direct, genuine replacement for the following ducted gas heater series:

• Bonaire MB3 Series Ducted Gas Heaters
• Bonaire MB4 Series Ducted Gas Heaters

It replaces Bonaire Part Number 5440801SP. If you're running a different model, check fittings and specs before ordering.

Features

• Genuine Bonaire Part: Ensures perfect fitment and reliable performance, matching original factory specifications.
• Direct Replacement: Specifically designed to replace Bonaire PN 5440801SP without modifications.
• Optimised Combustion: Restores proper airflow for complete, efficient, and safe combustion within the heater's furnace.
• MB3 & MB4 Series Specific: Engineered for seamless integration with Bonaire MB3 and MB4 ducted gas heating systems.

What's in the Box

• 1 x Bonaire Combustion Assembly Fan Kit (CTSPS5440801SP)

Using It on the Job

1. Isolate Power: Always begin by isolating electrical power to the ducted gas heater at the main switchboard. Apply lockout/tagout procedures as required by site safety protocols.
2. Access Components: Carefully access the combustion chamber and fan assembly area, referring to the Bonaire manufacturer's service manual for your specific MB3 or MB4 model.
3. Remove Old Fan: Disconnect any electrical wiring, gas tubing (if applicable), and mounting hardware from the existing combustion fan assembly. Note their positions for reinstallation.
4. Install New Kit: Position the new Bonaire Combustion Assembly Fan Kit (CTSPS5440801SP), ensuring all mounting points align correctly. Securely fasten the fan and reconnect all wiring and tubing as per the manual.
5. Test & Commission: Restore power to the unit. Perform a thorough functional test of the heater, checking for proper ignition, stable flame, correct airflow, and effective flue gas exhaust. Conduct a CO test to verify safe operation.

Limitations & Safety Notes

• Installation and servicing of gas appliances must only be performed by a currently licenced gas fitter in accordance with AS/NZS 5601 and all local regulations.
• Always ensure electrical power is fully isolated and verified before commencing any work on the appliance.
• This kit is specifically for Bonaire MB3 & MB4 Series ducted gas heaters; compatibility with other models is not guaranteed.
• Regular carbon monoxide (CO) testing should be part of any gas heater service to ensure safety.

Tradie Pro Tip: When replacing a combustion fan, always do a full inspection of the heat exchanger for cracks or blockages. A failing fan can sometimes be a symptom of a deeper issue, and a simple swap won't fix poor combustion or CO leakage.

Pair with gas pressure gauges and a quality carbon monoxide detector for a complete service kit. Also check out our range of Bonaire control boards for other common spares.