max wattage = 1400wt, av airflow = 40 m3/hr, size 20 x 20 x 7 inch, there are 3 filters, I just wash the coarse filter every 2 months, and replace the hepa filt

max wattage = 1400wt, av airflow = 40 m3/hr, size 20 x 20 x 7 inch, there are 3 filters, I just wash the coarse filter every 2 months, and replace the hepa filter once a year. I don't replace the coal filter as I don't have odors problem.