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You're welcome. :-)

You can see in the video at 0:28. The Auto and Dim buttons. :-)

Yes, the new filter design works with previous models. :-)

The procedure you are describing is to test to see if the sensor is operating correctly. This is mentioned on page 10 of the AD5500 manual. The procedure to reset the Replace Filter Indicator Light is mentioned on page 7.

Typically, it wouldn't be necessary, but you can if you wish. AirDoctor has a built-in ionizer, but it is turned off by default. The ionizer helps with revitalizing the air by infusing it with negative Ions. This is similar to the effect after a rainstorm or living by the sea. Some people enjoy creating this effect, but it is a completely optional feature. AirDoctor will work perfectly well if you never choose to use the ionizer option. AirDoctor does not depend on the Ionizer to achieve its high-level of air purification.

There is no particular recommendation regarding this. AirDoctor has a built-in ionizer, but it is turned off by default. The ionizer helps with revitalizing the air by infusing it with negative Ions. This is similar to the effect after a rainstorm or living by the sea. Some people enjoy creating this effect, but it is a completely optional feature. AirDoctor will work perfectly well if you never choose to use the ionizer option. AirDoctor does not depend on the Ionizer to achieve its high-level of air purification.

Filter Change Frequency Based on 24-hour daily usage for the 3500/3000 model: Carbon/VOC Filter: Every 6 months. UltraHEPA Filter: Every 12 months. Each new Carbon filter comes with a pre-filter attached. AirDoctor will automatically alert you when it's time to replace each of the two main filters. A light indicating Filter 1 (UltraHEPA) or Filter 2 (Carbon) will light up on the top panel and will remain lighted until it is reset by the user.

The 3500 replacement filters are made so that they fit into the new 3500 model and they prevent the user from installing them backwards, which some people have done. It is also designed to prevent the use of inferior counterfeit filters. Other than that, the machines function the same. If you purchase the new AirDoctor 3500 unit, you must purchase the new AirDoctor 3500 universal filter replacements, as the existing AirDoctor 3000 filters won’t fit in that unit. If you have the AirDoctor 3000, you can use either the AirDoctor 3000 replacement filters or the AirDoctor 3500 filters. The newly designed filters will fit in your AirDoctor 3000, so if you prefer to stick with that model that is perfectly fine as well.

Makes sure you are pressing the correct buttons and keep pressing them for a longer period of time. To reset the filter change indicator, press the AUTO and DIM buttons together for 3 seconds. The CLEAN FILTER light will flash 3 times and then turn off completely, indicating the unit has been reset. Information about this can be found in the troubleshooting section of the manual. If this doesn't work for you... Please call Customer Service and they can do some troubleshooting with you to determine what the issue is. Here is the Customer Service number and hours: 800-221-2515 Hours: Monday through Friday 7 AM to 4 PM PT Saturday 7 AM to 3 PM PT

Under normal usage, you wouldn't need to change the pre-filter, since each new carbon filter comes with one attached to it. The only reason to change it before it's time to replace the carbon filter is If you damage the pre-filter. A package of three should be all you would ever need to buy, but you'll have some on hand if you need to replace more than one. Some people have multiple AirDoctor units, so they will have a good supply as well.

Filter Change Frequency Based on 24-hour daily usage for the AD5000 model: 2 Carbon/VOC Filters: Every 6 months. 2 UltraHEPA Filters: Every 12 months. For the AD5000 model, the 2 Gas Trap Carbon (VOC) filter and the 2 Ultra HEPA filter are available for $125 for each set of 2. There is also a permanent pre-filter, which can be easily vacuumed to remove the larger contaminants like dust and hair. With proper care and under normal operating conditions, this filter should not need to be replaced. When you see dust on the pre-filter you can vacuum it and continue to use it. For optimal performance, we recommend that you clean the pre-filter every 1-2 months. AirDoctor comes with the first complete set of filters.

The pre-filter is a thin, black, flexible filter attached to the Carbon/VOC filter with Velcro, so they actually look like one filter. The purpose of the pre-filter is to provide a barrier that captures large things like hair and dust particles, which would otherwise unnecessarily clog up the carbon filter and shorten its life. The pre-filter can be vacuumed when a lot of debris has collected on its surface, so you don’t need to change it. You will receive a new pre-filter when you change the Carbon/VOC filter. For optimal performance, we recommend that you vacuum the pre-filter every 1-2 months, as needed, and leave AirDoctor in Auto mode.

The pre-filter is a thin, black, flexible filter attached to the Carbon/VOC filter with Velcro, so they actually look like one filter. The purpose of the pre-filter is to provide a barrier that captures large things like hair and dust particles, which would otherwise unnecessarily clog up the carbon filter and shorten its life. The pre-filter can be vacuumed when a lot of debris has collected on its surface, so you don’t need to change it. You will receive a new pre-filter when you change the Carbon/VOC filter. For optimal performance, we recommend that you vacuum the pre-filter every 1-2 months, as needed, and leave AirDoctor in Auto mode.