Replacement HEPA filter pre-filter: pull pet hair, residue, dust, lampblack, smoke and other stuff out of the air in the house, it is vital to keep fresh air for people with asthma or allergies.

Extra help of air purifier : install the pre-filter onto HEPA filters, filter and capture odors, particles, dust and other harmful gas, reinforce the purifying effect of air purifier, extend the life of HEPA filters.

Eco-friendly premium material: high quality activated carbon materials with strong adsorbing and filtering capacity, change pre-filter in the basis of filtering effect, usual need replacing for every 2-3 months, avoid weakening filtering effect, please do not rinse.

Size and applicable models: 11.25" in length, 13.9" in width, 0.2" in thickness, suitable for air purifier models HPA200, HPA202, HPA204, HPA250B, these pre-cut filters make it easy and quick to replace old filters, save your time and money, good fit for air purifiers.

Package includes: each pack contains 4 pieces of carbon activated pre-filters, applicable to HPA200 Series, should be replaced every 2-3 months, adequate for you to use for a quite long time.