u/yoshi105

Country: UK (Norwich, England) AQI ranges from 22 to 55 throughout the year

Rooms & volumes (ceilings 2.7 m; floor dims from the deed plan, total GIA 41.6 m²):

• Open-plan kitchen / living room (also my home office): ~23 m² floor → ~62 m³ (~2,190 ft³) (open-plan zone, area derived from total minus the other rooms)
• Bedroom: 3.20 × 3.78 m = ~12.1 m² floor → ~33 m³ (~1,150 ft³)

Filtration needs: Primarily household dust — skin/fibre dust, the stuff that resettles on shelves and skirting. Outdoor air here is clean, so VOCs, odours and smoke aren't really a concern for me. No pets, non-smokers.

Questions:

Based on my floor plan, do I need a filter system per room, or is one for the entire flat enough? When I work from home, I keep the doors closed, but between 6pm and 10pm, all rooms are open and accessible (the bedroom and living room doors are closed at night until the morning due to washing machine and dishwasher).

So far, my options:

• Levoit Core 400S
• Winix 500-2
• Coway Airmega 150

But you guys are the pros, if I'm missing anything out, please let me know.

Thanks!