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Air Purifiers

Filters & Accessories

AD5000/5500 Filters

AD3000/3500 Filters

Commercial Filters

HVAC Filter

Learn

Blog Press Our Story AQI

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AirDoctor 4000

Articles in this section

How to Replace Your AirDoctor 4000 Filters
What color options are available for AirDoctor 4000?
Is there a smart or connected version of the AD4000k?
What’s different about the control panel on the AD4000k?
Do I need to reset the filter lights for the AD4000 after replacing the filters?
Will AirDoctor 4000 filters ship separately from the unit?
How often do the AD4000 filters need to be replaced?
How much do the AD4000 replacement filters cost?
How noisy is the AD4000k?
How many fan speeds does the AD4000k have?

See more

How many fan speeds does the AD4000k have?

June 20, 2025 19:14

The unit features 6 fan speeds, just like the AD55k model. This allows for customizable airflow depending on your needs.

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