I purchased 3 Aller Air model 5000exec airfilters for aproximately 1500$ total. Every single one of these Air cleaners began making very loud, unbearable noises after only a month or so of use in a very clean enviroment. As it turned out the design was defective due to the fact that the air is channelled through a very dusty activated carbon element before going into the Hepa filter. This caused the Hepa filter to clog in 3 weeks when it should have lasted 5 years. The company has been of no assistance.
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