Finding the right replacement filter shouldn’t feel like detective work, but for many homeowners it does. Filter names, model numbers, and compatibility lists often vary between manufacturers, and retailers don’t always make the process easy. This guide eliminates the guesswork and helps you identify the exact filter your home needs—fast.

1. Start by Checking Your Current Filter

The most reliable way to identify the correct replacement is to check your existing filter.
Look for:

• A brand name (e.g., Samsung, LG, Whirlpool, Honeywell, Frigidaire)

• A model or part number

• A serial number or SKU

• A compatibility list printed on the filter body

Common places the model number appears:

• On the side of a refrigerator filter

• Embossed on an air purifier filter frame

• On a sticker attached to HVAC filters

• Printed directly on the packaging (if you still have it)

If the model number includes variations like “A” or “B,” write down the full sequence. Small variations can affect compatibility.

2. Identify the Filter Type

Filters generally fall into these categories:

• Refrigerator water filters

• Under-sink water filters

• Air purifier filters

• HVAC furnace filters

• Range hood filters

• Shower filters

Knowing your filter type helps narrow down brand-specific options.

3. Check the Appliance or System Label

If the filter model isn’t visible or worn off:
Look on the appliance itself. Manufacturers often place labels:

• Inside refrigerator compartments

• Behind the water filter housing

• On air purifier panels

• Inside HVAC units

• On the underside of range hoods

These labels often include a recommended filter model.

4. Use a Compatibility Cross-Reference

Most filters have compatible alternatives or third-party options. You can match your model number to:

• Equivalent OEM filters

• Certified aftermarket filters

• Multi-brand compatibility lists

This helps you pay less while keeping the same performance.

5. When in Doubt, Use Our “Find My Filter” System

Our search function makes it simple! 

6. Signs You’re Using the Wrong Filter

If you experience any of the following, your filter may not be correct:

• Poor water flow

• Odd taste or odor

• Leaks around the housing

• Reduced airflow

• Filter doesn’t fit properly

• Excessive noise from air systems

7. Shop Certified Filters for Every Brand

Accumulair

Arm&Hammer

AustinAir

Conclusion

Replacing your filter doesn’t need to be complicated. With the steps above—and access to a complete compatibility database—you can find your filter quickly and confidently.