How to Install a Sub-Zero Air Filter (The Right Way)

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How to Install a Sub-Zero Air Filter (The Right Way)

If you own a Sub-Zero refrigerator, you're already invested in premium food preservation. But did you know that keeping your air filter fresh is just as essential as changing your water filter? The Sub-Zero air purification system reduces odors, bacteria, and ethylene gas — all of which can affect your food's taste, texture, and shelf life.

Here's a simple step-by-step guide to help you install a genuine Sub-Zero air filter quickly and correctly — or watch the whole thing in the video below.

Why the Air Filter Matters

Sub-Zero's air purification system is based on NASA-developed technology. It helps remove:

Food-spoiling ethylene gas (especially from produce)
Odor-causing bacteria
Mold spores and other airborne contaminants

Replacing the filter every 12 months ensures this advanced system keeps doing its job.

What You'll Need

A genuine OEM Sub-Zero air filter (Model #7042798) — fits most newer models, including BI, IT, and IC series
No tools required — the cartridge releases from behind a hinged cover

Step-by-Step Installation Instructions

To access the air purification cartridge, grasp the outside cover from the bottom and rotate upward.
Grasp the black cover from the top and rotate downward. The cartridge will pop out and can be removed.
Remove the new cartridge from its packaging and insert it with the connector pointing downward.
Once in position, close the black cover. Then rotate the outside cover downward until it closes against the back wall.
Once the cartridge has been replaced, touch and hold PURE AIR on the control panel for five seconds to reset.
The indicator will appear in the control panel display but not flash.

Sub-Zero 7042798 air purification cartridge location

Keep It OEM

Always use genuine Sub-Zero air filters. Aftermarket options may not fit properly or deliver the same level of performance. At Home Appliance Specialists, we only carry 100% authentic Sub-Zero parts—shipped fast and guaranteed to fit.

Need Help Finding the Right Filter?

Visit our Sub-Zero air filter collection, try our 30-second filter finder, or contact our team — we're happy to help make sure you get exactly what your fridge needs.

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