Update: Used the vacuum for a few days then the hepa filter started making this horrible howling noise. DEFINITELY air leak in the HEPA filter, don't buy it. They are not as good as the replacement filters I bought from another seller. The small flat circle filter was too big, and the HEPA filter falls out without a cap, unlike the latter which has a tighter fit, suggesting it's not airtight. Very disappointed. I will not order anymore.