About 1.5 years ago I taped on a 16x20 3M MPR2800 filter to a Taotronics AP-003. It boosted the CADR by about 20-30%. Let's take some guesses as to what it is a 1.5 years later? You think it's still performing at 90% of where it was, 50%, or 30%? Let's see your guesses! Will post the CADR tomorrow
