What to look for
- Clean-air delivery (CADR) matched to your room — see the CADR sizing guide.
- Genuine MERV-13 filtration for fine particles — not a lower washable grade.
- Standard, replaceable filters rather than proprietary cartridges, so running costs stay low.
- Quiet operation (ideally under 35 dB) so you actually leave it running.
- Activated carbon as well, if odours or VOCs are a concern — particle filters alone do not remove smells.
Assembled or DIY?
A ready-to-run kit is plug-and-play and tidy; a DIY build (the Corsi-Rosenthal box) is the cheapest route and a satisfying afternoon's work. Both deliver strong clean-air performance — the choice comes down to budget, noise tolerance and whether you enjoy building things.
Our recommendation
CleanAirKits Luggable XL Ultra (7-Fan)
681 m³/h CADR, MERV-13, under 35 dB — powerful whole-home clean air — no proprietary lock-in, ships from the UK.
Check price →Use code KITS10 for 10% off at checkout.How to choose by room
Start with the room, not the product: measure the floor area and decide whether your main concern is particles (dust, pollen, smoke) or odours (cooking, VOCs). Our which-kit guide and buying criteria walk through it, and the CADR guide covers sizing.