QUOTE(luvimp @ May 14 2015, 11:56 AM)
Blueair 700sqft.
Coway up to 2650sqft.
I will still choose Blueair cause easier to change filter.
I gonna use it to purify air at living hall to dining hall (open kitchen concept).
So 700sqft roughly enough exclusing kitchen.
Furthermore, blueair have remote control and wheels that i can bring it around to where it need it easier.

The actual price for blueair is not expensive. The buying power here and the big profit that cause this unit very expensive.
Any AP is easy to change and clean the filter. I use sharp, korea brand and Philip before. All are easy to clean and change.
I won't get that too big size AP. Cause
1) It is ugly to place that big unit in the hall.
2) I don't think it can reach that far end to suck the dust toward the AP.
3) You really need to max the fan speed to get that far. And the crazy loud fan noise.
I rather separate to 2 small unit.
I seldom switch ON the AP. Only use it once a while or during haze time. Don't need to life in a clean room.
The sharp new model don't have the remote. My office old model have. Minimum of usage the remote. But better than nothing.