Airmega 400

So the bedroom is 3.8 × 3.3 m × 2.4 m = 30.1 m3. Multiplying by 6 for sensitivities, CADR should be 181 CFM. And living room/kitchen area is 7.1 × 4.7 m × 2.7 m =90.1 m3. Again multiplying by 6, CADR should be 541 CFM. For the bedroom, you could choose the Coway Airmega 150. Its top CADR is 281 m3/h

Please provide details to prove what you said. Coway AirMega 400 is about 859 CAD with CADRs of 328 to 400 CFM for various particles. I can buy almost four North Box 5X units and equip them with United Filter MERV 13s for slightly more than the cost of one Coway AirMega 400. The CADR for four units

Are your asthma triggers particulates (e.g., soot, smoke particles, small dust particles, mold spores, pet dander)? If your ceilings are higher than 8 ft., you need to calculate by volume. 29 ft. × 23 ft. × 14 ft. = 9,338 cubic feet. 9,338 cu. ft. ÷ 8 ft. = 1,167.25 sq. ft. as the "adjusted" purifie