A Quick Word About Our Replacement Filters...Customers often ask what the difference is between the Summit and Cloud Filter Packs. The difference can be found in the Summit's unique smoke eliminating capabilities. While the Summit and Cloud utilize five of the same filters, the Summit filter pack also features an ozone plate for eradicating smoking odors. So when shopping for a replacement filter, please know that each filter is compatible with both air purifiers, with the exception of the ozone plate (Summit air purifier only).More Questions? Contact Us.