not sure if the filters can be replaced, it doesnt come with a spare and is not supposed to need replacement.

it cost me around RM8-900 when i bought it, i think prices have gone down. not sure if the model is still available.

mine can be pretty loud at maximum fan settings, but at minumum/medium settings its no louder than the average ceiling fan.

well the one i got works pretty well, during the recent haze, it cleaned the air pretty well removing the smokey smell and cleared the stuffyness with ease.

i got 3, so yeah, i think it works. it also helps to keep the place cool by acting as a fan.

i bought mine at RM8-900, it helps keep the area cool by increasing air circulation, the same way a fan does it. i'm not sure if the model is still in production since its no longer on the sharp official website, but iirc the newer models should perform as well if not better.