THE BIT THEY DIDN'T PUT ON THE BOX.
You may be paying for the plastic frame.
Lifestyle air purifier startups generate recurring revenue by charging £40–£70 for replacement filter cartridges. Sourcing the identical grade H13 fiberglass HEPA sheet media or framing from commercial HVAC filtration suppliers yields the exact same particle capture rating at a 75% lower cost point.
SO WHAT'S THE CATCH?
Loose filter media is not an assembled HEPA cartridge; seal integrity is critical.
“The interesting bit isn't the badge. It's what happens when you search for the part behind it.”
THE INTERNET DETECTIVE'S CHECKLIST
Look for complete part numbers and revisions, make sure you're comparing the same quantity, and check the exact model/application. That's especially important with electrical, braking, steering, battery and other safety-related components.