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Ozone Removal with OzonMaker by MagnetiMarelli: Air Conditioning On or Off?

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When using an OzonMaker to remove odors from a car air-conditioning system, should the air conditioning be on or off?

Use internal recirculation with the circuit closed, but keep the air conditioning/climate system off; the blower should run so ozone is carried through the ducts, while AC off leaves the evaporator unfrosted and easier for ozone to act on [#12944642] [#12944798] [#12944836] One user adds that ozone can also interact with the moisture/condensation on the evaporator, so some people use both methods depending on contamination, but the thread’s main recommendation is AC off [#13095294]
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  • #31 17367226
    spirosun
    Level 10  
    Posts: 69
    Rate: 22
    I bought a Viaken ozonator, which has a power of only 400mg, but when it comes to the car itself, I think it helped. I did a cycle of 2x 30 minutes and it removed the stench perfectly after replacing the filter. Ozone was directed to the passenger compartment directly in place of the filter so that as much as possible hit the evaporator.
    Regards
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  • #32 18793358
    cool_wicia
    Level 3  
    Posts: 252
    Rate: 14
    I will step on and set the airflow to the windshield or to the feet or straight?
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  • #33 18857460
    darekogarek
    Level 9  
    Posts: 52
    Rate: 6
    Hello.
    I bought an OZONATOR 24g / h. How many minutes should I ozone the inside of a passenger car.

    Ozone Removal with OzonMaker by MagnetiMarelli: Air Conditioning On or Off?
  • #34 18872081
    12pawel
    Level 34  
    Posts: 2355
    Help: 207
    Rate: 696
    If you actually have 24g / h, 20 minutes to half an hour should be enough.
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Topic summary

✨ The discussion revolves around the use of the OzonMaker by MagnetiMarelli for ozone removal in vehicles, specifically whether to operate the air conditioning during the process. Responses vary, with some users advocating for the air conditioning to be turned on to facilitate air circulation through the evaporator, while others suggest that better results are achieved with the air conditioning off to prevent frosting of the evaporator, allowing ozone to work more effectively. Key points include the importance of a closed circuit during ozonation, the impact of temperature on ozone effectiveness, and the necessity of proper ozone concentration and timing. Users also share personal experiences and methods for ozonation, including the use of different ozonators and techniques for targeting the evaporator directly.
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FAQ

TL;DR: A 7 g/h car ozonator needs just 30 minutes, because "ozone breaks down after 30 minutes" [Elektroda, ChatP, post #13722572] Keeping the fan on recirculate with A/C off exposes the evaporator longer and hits all vents. Why it matters: Correct settings speed disinfection and avoid material damage.

Quick Facts

• Generator size: 0.4 – 24 g/h units marketed for cars [Elektroda, spirosun, #17367226; 12pawel, #18872081] • Recommended run-time: 20–30 min for ≥7 g/h; longer risks oxidation [Elektroda, ChatP, post #13722572] • Safe cabin temperature: 20–25 °C; heat accelerates ozone decay [Elektroda, LOTREBOR, post #13019374] • OSHA exposure limit: 0.1 ppm over 8 h [OSHA, 2020] • New cabin filter before treatment boosts effect by ≈15 % airflow gain [Elektroda, grala1, post #13095735]

Should I keep the air-conditioning compressor on during car ozonation?

No. Run the interior fan on recirculate but leave the A/C compressor off. A dry, unfrosted evaporator lets ozone reach microbes more easily [Elektroda, Błażej, #12944836; bolero, #12945002].

What about smaller units like 0.4 g/h?

Double two 30-minute cycles (total 60 min) with a short airing break. Users report full smell removal at that output [Elektroda, spirosun, post #17367226]

Which vent setting—feet, face, or windshield?

Select any single outlet; volume matters more than position. Recirculate mode bypasses the cabin filter in most cars [Elektroda, MobilTruck, post #13095930]

Does temperature affect ozone efficiency?

Yes. Ozone decomposes faster as temperature rises; every 10 °C increase halves its life [Elektroda, LOTREBOR, post #13019374] Keep cabin near 25 °C, avoid direct sun.

Will high-dose ozonation damage interiors?

Edge case: multi-hour sessions oxidised rubber, plastics, and upholstery, leaving sticky surfaces [Elektroda, mefkm, #13718569; ChatP, #13722572].

How do I tackle persistent cigarette odour?

  1. Deep-clean fabrics. 2. Replace cabin filter. 3. Ozone 30 min at ≥7 g/h. Repeat once after 48 h. Ozone cannot "eat" embedded tar without prior cleaning [Elektroda, ChatP, post #13722572]

Is a new cabin filter really necessary before ozonation?

Yes. A clogged filter re-seeds bacteria and restricts flow; replacing it improves airflow by about 15 % [Elektroda, grala1, post #13095735]

What is the OSHA limit, and do I need PPE?

OSHA sets 0.1 ppm over 8 h. Wear a respirator or vacate the area during treatment, then air the car 10 min before entry [OSHA, 2020].

Quick 3-step ozonation procedure?

  1. Close windows, set fan to recirculate, A/C off, speed 1.
  2. Place ozonator on floor, run 30 min (7 g/h) or per chart.
  3. Switch off, wait 10 min, open doors, vent 10 min [Elektroda, bolero, post #12944642]
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