Return Air Filter

When it comes to getting the most out of your ducted air conditioning system, most homeowners focus on the obvious: brand, size, installation quality, and zoning. But there’s one critical component that often gets overlooked — your return air filter. More specifically, the G4 return air filter.

If you're not using a G4 filter, you're missing out on serious benefits for both your system performance and your indoor air quality.

What Is a G4 Return Air Filter?

The G4 filter is a medium-grade filter rated to the EU G4/ISO Coarse 65% standard, meaning it traps up to 90% of large airborne particles like dust, lint, pollen, and pet dander before they enter your system.

Unlike basic mesh filters, which only catch the big stuff, the G4 filter delivers a much higher level of filtration — without choking your airflow like a HEPA filter might.

5 Reasons Every Ducted AC System Needs a G4 Filter

1. Protects Your System

Dirt and dust are your system’s worst enemy. When these particles sneak past a low-grade filter, they can clog your fan coil, reduce airflow, and even lead to system breakdowns.

A G4 filter stops that at the source. Less dust inside your system means:

• Lower running costs

• Fewer breakdowns

• Longer system life
  
  

2. Improves Indoor Air Quality

This one’s huge — especially if you have kids, pets, allergies, or asthma. The G4 filter acts like a silent guardian, capturing pollutants that can trigger respiratory issues or settle into your carpets and furniture.

It helps reduce:

• Dust mites and pollen

• Pet dander

• Mould spores (a big issue in humid Aussie climates)
  
  

3. Keeps Your Home Cleaner

Ever notice a fine layer of dust just days after cleaning? That’s often from a poor-quality air filter letting particles circulate. A G4 filter helps keep your home noticeably fresher and cleaner — less dusting, fewer smells, better living.

4. Better Airflow Balance

Unlike high-resistance filters that block airflow, the G4 filter is designed for ducted systems — it strikes the perfect balance between filtration efficiency and airflow, so your system doesn’t have to work harder than it should.

5. It’s Easy to Upgrade

If you’ve already got a ducted system, upgrading to a G4 filter is simple. We custom-cut filters to fit your return air grille, so there’s no need to modify your system — just swap and go.

Did You Know?

Most builders or installers include basic filters when installing ducted systems — but these only catch the largest particles. They do next to nothing for indoor air quality or long-term system protection.

So if it’s been a while since you’ve checked your filter, or you’ve been using a standard one, it’s time to upgrade.

Your Ducted System Could Be Breathing In Dust Right Now

Think of your return air grille as your system’s “lungs.” Would you breathe through a cheap screen full of holes? Probably not. Neither should your AC.

By installing a G4 return air filter, you:

• Improve your family’s health

• Protect your expensive AC investment

• Lower your electricity bill

• Keep your home cleaner
  
  

Order Your G4 Filter Today from The Ducted Air Installer

At The Ducted Air Installer, we supply and install high-performance G4 filters that are:

• Cut to fit your system perfectly

• Affordable and long-lasting

• Backed by expert advice and service
  
  

Call us today or request a quote online.
We’ll check your system and deliver the right filter for your needs — quickly, cleanly, and professionally.

Breathe better. Live better. Protect your air.