A common question after building your first box: how many Corsi-Rosenthal boxes does a whole house need? The honest answer is one per room you actually use — a purifier only cleans the air in the room it’s standing in.
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 CORSI10 for 10% off at checkout.One box can’t do a house
Air doesn’t flow freely between closed rooms. A single box in the hallway leaves the bedrooms untouched. Plan room by room, starting where you spend the most hours.
Prioritise by hours spent
- Bedrooms — a third of your life; the highest-value box.
- Main living room — where everyone gathers in the evening.
- Home office / nursery — add as needed.
Two to three boxes cover most UK homes; kitchens and bathrooms rarely need one.
Build cost vs buying a set
At ~£60 a box, three DIY builds is ~£180 in parts plus your time and a stack of cardboard in each room. If you’d rather not have three taped boxes on show, tested units give the same clean air per room, run for pennies, and look like something you’d keep in a living room.