The Bosch
Air 4000 is part of the
Air Purifiers test program at
Consumer Reports. In our lab tests, Room Air Purifier
models like the Air 4000 are rated on multiple criteria, such as those
listed below.
Dust, pollen, smoke removal (low):
How well a model clears air of dust and smoke when operating at a lower, quiet speed.
Dust, pollen, smoke removal (high):
How well a model clears air of dust and smoke when operating at its highest speed.
Noise (low speed):
How loud a model is at the speed used for Low Speed testing.
