HM420 HEPA Carbon Air Purifier for Medicinal and Indoor Growing


  • Specialty air cleaner with 60 sq. ft. of medical HEPA, certified to remove 99.97% of airborne particles 0.3 microns and larger. Contains 15 pounds of granular carbon and zeolite for the adsorption of odors, gasses and chemicals. Comes with wheels for easy portability. Effectively cleans an area of 1500 sq. ft. (with normal ceiling heights).  Download our PDF guide on air purifiers in hydroponics for more information. * The HM420 is our HM400 model marketed towards the hydroponic and cannabis community.

    Unit size: Stands 23” tall x 14.5” wide x 14.5″ wide 

    Who should consider the Austin HM420?

    • Indoor growers who value the health of quality of their plants and crops 
    • Experienced growers understand the power of prevention and are more than willing to implement a high quality air purifier with HEPA and activated carbon if they want to prevent any potentially devastating problems in the future.
    • Grow rooms close to farms, cities and highways

    Why is the Austin HM420 an excellent choice for hydroponic and indoor growing? 

    • Very effective at removing particles from the air including dust, pollens and smoke elements 
    • Great at removing chemicals, gases and odours from the air 
    • Helps reduce unwanted odours from marijuana plants and smoke
    • Removes viruses and bacteria 
    • Designed to last for years, removing all air pollutants and delivering the freshest of air - great for the grower and the plants!
  • 360-Degree Progressive Filtering System

    The HealthMate™ addresses the complete spectrum of air cleaning, removing sub-micron particles, noxious gases and chemicals. Austin Air’s 360-degree intake system draws air into all sides of the HealthMate™, passing it through a 4-stage filter.

    The result, more clean air delivered faster and more efficiently than any other air cleaner on the market.

    STAGE 1 – Large Particle Pre-filter Removes particles easily seen by the (e.g.dust, hair and pet dander)

    STAGE 2 – Medium Particle Pre-filter Removes small to medium size particles (e.g.molds, spores and pollen)

    STAGE 3 – 15 lbs. of Activated Carbon and ZeoliteRemoves chemicals, gases and odors.

    STAGE 4 – 60 sq.ft.of Certified HEPA Removes 99.97% of all particles larger than 0.3 microns

  • Benefits of Clean Air in Hydroponics:

    • Indoor gardeners who implement advanced air purification techniques can decrease pathogens, pollens and VOCs found in the air and create a healthier environment.
    •  Although most odours are more of a nuisance than a detriment, some, like the ones left behind by chemical insecticides or fungicides, can be dangerous. Air purification devices that eliminate or reduce odors can be an effective way to destroy VOCs found in and around an indoor garden.
    • For some indoor gardeners, unwanted pollen in the air can cause problems. Cross contamination of species can ruin an entire crop, especially if the grower is attempting to perform controlled breeding.
    • High Efficiency Particulate Air (HEPA) filters are paper-like filters that remove particles from the air down to .3 microns in size. Many mold spores are in the 1 to 20 micron size range, making HEPA filters a good choice for trapping mold spores. HEPA filters will also filter larger particulates out of the air, including insects.
  • Technical Specifications


    Height: 23 in. Width: 14.5 in. x 14.5 in.


    45 lbs


    23 gauge steel housing

    23 gauge perforated steel intake

    Easy roll casters (standard)

    Baked on powder coat finish (no off-gassing)


    Permanent, split capacitor motor, rated for continuous high RPM, long life duty

    Shock absorbing motor mounts

    CSA & UL approved


    Plastic centrifugal fan

    Three speed control

    400 CFM on high setting

    200 CFM on medium setting

    75 CFM on low setting

    Power Rating:

    120 volt

    135 – watt, 1.3 amp power consumption on high setting

    85 – watt, 0.71 amp power consumption on medium setting

    56 – watt, 0.51 amp power consumption on low setting

    Sound Level:

    66Db at high speed

    55Db at medium speed

    Lower than 50Db at low speed

    Filter Assembly:

    Dimensions: 13.5 in. diameter, 14.5 in. height

    Permafilt™ prefilter

    15 lbs activated carbon and zeolite (ten to one ratio)

    60 square feet True Medical HEPA grade filter medium

    Metal end caps with foam sealing gaskets top and bottom

    Total weight of 21 lbs

    * All product specifications are subject to change without prior notice from the manufacturer