Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Horrible Noisy Machine

This air purifer is a good size for a small room, but all the good ends there. Within days the motor started a loud whinning noise that never stopped. I returned it for another identical unit and that unit also began loud noises within a few days. I finally cut out the GE motor and fan they are so proud of (first thing on the package feature list in large bold font) and replaced it with a panasonic panaflo quiet fan.I also think the filters are too expensive and designed improperly. Almost all other air cleaners have a seperate activated charcoal filter ahead of the hepa filter to keep the "big pieces" from clogging the expensive hepa. This unit has an integrated charcoal behind the hepa, thus having the expensive hepa filter protecting the inexpensive charcoal unit. I make throw away charcoals from Honeywell generic filter stock to go ahead of the hepa for my unit...