Frequently Asked Questions
Quick answers about finding and replacing filters.
General
How do I know which filter I need?
Use the category pages to select your brand/model/size, or check the label on your current filter for the part number and dimensions.
Where do you link for purchases?
We point to major retailers (Amazon, Walmart, Home Depot, Lowe’s, Target) so you can compare pricing and shipping options.
Car Filters
How often should I replace the cabin filter?
About every 12,000–15,000 miles or once per year — sooner if airflow drops or odors persist.
Do I need OEM filters?
OEM guarantees fit. Many reputable aftermarket filters meet or exceed specs — just confirm compatibility for your make/model/year.
HVAC Filters
How often should I replace an HVAC filter?
Most homes should replace filters every 60–90 days. If you have pets/allergies, check monthly.
What is a MERV rating?
MERV measures filtration efficiency. Higher MERV captures finer particles, but verify your system’s maximum supported rating.
Air Purifier Filters
How often should I replace HEPA filters?
Typically every 6–12 months, depending on usage and air quality.
Can I wash and reuse filters?
Some pre-filters are washable; HEPA and carbon filters usually are not. Check your model’s manual.