Offices are perfect for a Corsi-Rosenthal box: lots of shared air, plenty of desk space to stand one on, and a real payoff in fewer bugs going round. Here’s how to size and run one — and when a tidier tested unit makes more sense.
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.Why an office needs one
Put several people in a room for eight hours and CO&sub2; climbs while any airborne bug recirculates. A CR box adds 4–5 air changes an hour cheaply — the same principle schools use.
Sizing for a meeting room or open plan
A single five-fan CR box handles a typical 6–8 person meeting room (~40 m²). Open-plan floors need one unit per zone rather than one big box in a corner — air doesn’t travel far across a busy floor.
The noise problem in a quiet office
This is where DIY boxes struggle: box fans are audible, and on a video call that’s a dealbreaker, so people switch them off. If the room needs to stay near-silent, a purpose-built unit with high-static-pressure fans delivers the same clean air under 35 dB.
Cost for a workplace
A DIY box runs about £60 in parts; a tested unit costs more up front but arrives assembled, looks the part in a client-facing space, and runs for about £2/yr. For one or two rooms, either works — for a whole floor, factor in build time.