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How to Clean Your Ducted Air Conditioner Filter

18/08/2025
by Rick Coleman

As the Aussie seasons shift, our ducted air conditioners go from being a luxury to an absolute necessity. Whether it's battling a sweltering summer heatwave or taking the chill off a frosty winter morning, we rely on these systems for year-round comfort. But for your ducted system to work efficiently and keep pumping out clean, fresh air, there’s one simple but crucial task you need to keep on top of: cleaning the filter.

A clogged filter can restrict airflow, force your system to work harder (hello, higher energy bills!), and circulate dust and allergens throughout your home. The good news? Cleaning it is a straightforward job you can tackle yourself. Here’s our guide on how to clean your ducted air conditioner filter, plus a look at where you can source top-quality systems.

A Step-by-Step Guide to Cleaning Your Ducted Air Con Filter

Before you start, always remember to turn off the power to your air conditioning unit at the main switchboard. Safety first, always!

1. Locate the Return Air Grille and Filter

Your ducted system's filter is located behind the large return air grille. This is the big vent, usually mounted in the ceiling of a central hallway or living area, that sucks air from your home into the ductwork. These grilles are typically held in place by clips or screws.

2. Open the Grille and Remove the Filter

Carefully open the grille. It might be hinged on one side, or you may need to undo the clips on all sides to swing it down. Once open, you’ll see the filter—a mesh or fabric-like screen. It should slide or pop out of its frame easily. Take note of how it fits in, so you can put it back correctly later.

3. Inspect the Filter for Damage

Give the filter a quick once-over. If you spot any significant tears or damage, it’s best to replace it entirely. A damaged filter won’t do its job properly.

4. The Cleaning Process

For most standard reusable filters, the cleaning process is simple:

  • Vacuum First: Use a vacuum cleaner with a soft brush attachment to gently remove the bulk of the dust and lint from both sides of the filter.
  • Give it a Wash: Take the filter outside and use a garden hose with a gentle spray setting to wash it. Always spray the water from the clean side through to the dirty side to push the embedded dust out, not further in. For greasy or stubborn grime, you can use a mild detergent mixed with lukewarm water and a soft brush to give it a gentle scrub.
  • Rinse Thoroughly: Make sure you rinse off all suds and detergent residue.
  • Let It Dry Completely: This is a crucial step! Shake off any excess water and leave the filter to air dry completely in the shade. A damp filter can quickly become a breeding ground for mould and mildew. Never use a hairdryer or place it in direct, hot sunlight, as this can damage the filter material.

5. Reinstall the Filter and Grille

Once the filter is bone dry, carefully slide it back into its frame in the return air grille. Ensure it's sitting snugly and securely. Close the grille, making sure the clips lock back into place.

6. Power Up

Head back to your switchboard and turn the power to your air conditioner back on. You’re all set to enjoy cleaner, more efficient air conditioning!

How Often Should You Clean Your Filter?

For a typical family home, it’s a good idea to check and clean the filter every 2-3 months. However, you might need to do it more frequently if:

  • You have pets that shed hair.
  • You live in a particularly dusty area or near a construction site.
  • Someone in your household suffers from allergies or asthma.
  • You use your system heavily throughout the year.

Sourcing Quality Ducted Air Conditioners from Schnap.com.au

If you're in the market for a new ducted air conditioning system or looking to upgrade your current setup, navigating the options can be overwhelming. For trade professionals and savvy homeowners working with licensed installers, having a reliable supplier is key.

This is where a dedicated supplier like Schnap.com.au comes in. They are an Australian-based online store that provides a wide range of heating and cooling solutions, including high quality ducted air conditioners. Schnap offers systems from leading, trusted brands that are proven performers in the demanding Australian climate.

By sourcing from a specialist supplier, you can access detailed product specifications and compare different units to find the perfect match for your home's size and your family's needs. Whether you're building a new home or retrofitting a system, exploring the range of ducted air conditioner products on their website gives you insight into the latest technology and options available.

Regularly cleaning your ducted air conditioner filter is one of the easiest and most effective ways to ensure your system runs efficiently for years to come. It’s a simple task that improves air quality, lowers your running costs, and extends the life of your investment.