This type of plant-pathogen is classified as an obligate biotroph, meaning it derives nutrients from plant tissues and cannot grow apart from its host. It's a compact air purifier that can pull air. Prune out diseased tissue and destroy it. Step 2: Vacuum the area. Some of the most common cannabis diseases are spread through the air, such as blight and powdery mildew. Shake the contents to mix well and pour at the base of plants or trees to treat powdery mildew. 4. 97% of all viruses, mold, and. 3 microns) from the air and is equipped with carbon for heightened protection against household odors and VOCs. 2, Wolf J. Due to the environmental conditions in greenhouses, cucumber downy mildew, powdery mildew, and tomato gray mold are prone to occur and these diseases can easily cause crop yield losses. Your crop can get infected even if you use the best cannabis. 97% of particles at 0. This is the source of next season’s inoculum. 2. 97% of particles. cruciferarum has been reported on Indian mustard in Korea and Chinese cabbage in China, respectively (Kim et al. 3 microns in size. Selective Demo. It comes with a true HEPA filter and an activated. For light odor correction, we carry highly effective odor-blocking gels and sprays. Precision hepa filters are standardized to remove 99. Set controls for 40-60% and let run during night cycle. Mold Control Eliminates mold, mildew, virus and bacteria to prevent crop loss Safe, effective, & 100% chemical free Creates a healthy environment for your plants & workers Odor Control Agriair® neutralizes odor + Volatile Organic Compounds (VOCs) More cost effective than carbon filtration Ensures compliance with clean air regulations Pollen. SKU #: OA1600PAC-230-701. 5 Decontaminate and maintain your environment with hydrogen peroxide. Baking Soda Mixture. Installing sufficient UV lighting systems in your air handler. In fact, free water can kill the spores of most types of fungi that cause powdery mildew, and inhibit the growth of the mycelia. ohhhh one more question, i have a HEPA air filter thing that im running into my intake fan (it helps bring down the humidity, at least keep it in check. The Germ Guardian True HEPA Filter Air Purifier with UV Light Sanitizer is a great option for those who are looking for an air purifier that not only helps with powdery mildew but also eliminates germs, mold, smoke, pet dander, etc. UV-C radiation can be used to denature the proteins (DNA) of potential biological contaminants and has been shown to be effective against powdery mildew and botrytis. ) is a globally important vegetable, the production of which is severely constrained by powdery mildew caused by Podosphaera xanthii. These fungi grow on the upper and lower leaf surfaces, young stems, shoot tips, flower buds, and/or blossoms of plants. Perpetual harvest, dense scrog/sog systems, and damp basement grows are particularly vulnerable to powdery mildew. Get AiroClean420 Pricing. exposure pocket filter in . 1. 6 Disease Cycle for Powdery Mildew. 3 microns – almost four times smaller than the average human hair. Regular application every one to two weeks helps keep WPM at bay. Bleach cannot penetrate wood, but the water in it will eventually get absorbed into the surface. Let the mildew dry out. Filter the intake with a Hepa filter to eliminate spores from entering room. Therefore, it is of great importance to detect and control the airborne disease spores of greenhouse crops to stabilize and increase crop yield. Best with washable filter: Blueair Blue Pure 211+. On cannabis (Cannabis sativa L. Powdery mildew is a fungus that affects many plants. Follow with a cloth dipped in clear water, then wipe. 1, Fabre A. Set controls for 40-60% and let run during night cycle. 3 micron particles and an even higher percentage of larger particles. Never mixUnfortunately, it is impossible to get rid of all mold spores in the air so you need to replace the air filter in your ac unit regularly. Airoclean 420 is far more effective than HEPA filters, which use a “screen door. The latent period of powdery mildew is just 7 days, under optimal conditions. Be sure to meticulously maintain your filtration systems. Gather and destroy dead leaves and stems in the fall. Spray the mixture onto the plants every two weeks. These are 12 signs your house. HEPA filters are required by the US Department of Energy to stop 99. Find baking powder online. “They do not remove gases and odors. Vornado Air Purifier for Mold – Most User-Friendly. 63 (15%) SKU: VNT-GB-FF08. Chuanmai104 (CM104, Triticum aestivum L. Add to Cart. During the 2017 growing season, environmental conditions were highly favorable for powdery mildew development and severe infection. Compact and portable HEPA air cleaner utilizes 4-stage filtration to constantly and quietly filter the air in small to medium sized spaces. Milk and Whey. Mold is the common term used to describe a downy or furry growth on the surface or organic matter, caused by fungi, especially in the. Powdery Mildew (Erysiphe polygoni) Powdery mildew manifests as a white powdery substance on the surface of the leaves. When the area is dry, prime it with an alcohol-based, white pigmented shellac, such as Zinsser Bullseye, and use a paint containing mildewcide. Carbon Filters & Odor Control /. Thanks to its true HEPA filter, this air purifier from Winix works to capture 99. Spray directly onto mildew-infected plant tissue. The filter and contents of the HEPA vacuum must be disposed of in well-sealed plastic bags. 975 effective at filtering mold spores and other allergens. Quick facts. 1. Run the vacuum over the area, then take the vacuum outdoors to dispose of the contents. Cucumber plants were grown in the greenhouse until the 1~2 leaf stage, after which they were treated with a chemical fungicide and a culture filtrate of Bacillus sp. If you get a whiff of a musty or moldy smell, you know that something isn’t right. Mildew grows flat and remains on the surface. The soap helps the mix spread and cling to the leaf surface. Rust. Powdery Mildew. Powdery mildew does not cause significant damage to the health of the tree. A clean, soft cloth or paper towels. I believe that the Tenergy Sorbi 8541833194 model is the best dehumidifier with air purifier you can buy for under $100. Reapply every 7. All air must be filtered to eliminate the possibility of powdery mildew spores from entering the facility. Introduction. CADR rating: 200. 99% efficiency at 0. To remove spores, an air purifier needs to have a HEPA filter, which is a type of filter used to remove solid particles from the air. Remove the top and the. These symptoms are indicators of stress, which may be caused by powdery mildew, drought conditions, poor site conditions, and/or crown canker. nudum). Don’t be too rough—you do not want to injure the plant by opening up tears in the leaves. It can turn to shades of yellow, brown, and black in its later stages. The disease continues to spread throughout winter, especially if it is mild. Spread the paste over the moldy grout, let sit for 10 minutes, then scrub the. PM is a common intruder in the grow room. This means True HEPA filters are an effective. It's a good control for mild to moderate powdery mildew infections. This four-in-one air purifier for mold is a great budget option. I have a filter stack at the base of my column that steps from 10 microns, through 8 micron pyrex wool, finally through a 5 micron Filter. 1 tsp liquid dish soap. Runny or stuffy nose. At the end of the season, you should be sure to remove all the infected. Organic removal of powdery mildew is always preferable to using harsh. Use Vinegar: Mix one part vinegar and one part water. 97 percent of airborne pollutants, including mold particles as small as 0. In summers with a lot of rainfall, powdery mildew can run rampant. View as: Grid List. To learn how the AiroClean420 can prevent powdery mildew from infecting buds during and after harvest, contact us online or call 844-247-3913 and talk to one of our AiroClean420 experts. For reference, mold spores are usually between two and ten microns in size. The H13 True HEPA filter eradicates 99. Winix 5300-2 Air Purifier with True HEPA Filter. 25 proposed a new method based on image processing and artificial neural network to automatically detect powdery mildew spores. 3 microns particles, including mold, mildew and viruses. Crapemyrtles are especially susceptible. As a. I had a boss who brought his dog into the flower room and sure as shit 7 days later we had mites and PM on the same path where that little bastard wandered through. Infected buds can contain mold, which can impact the quality of the final product and even be harmful to consume. Most resistant cucumber cultivars become susceptible to powdery mildew at low temperatures. Make sure the vacuumed material is tightly sealed in a plastic bag, so no spores can escape. Once you have the necessary equipment, it’s time to clean your grow tent. It’s best to call a mold restoration. They will release mold spores but can’t remove the mold growth, which puts the mold spores in the air. Vinegar: Vinegar is rich in acetic acid that’s harmful to the fungus. Spritz the affected areas with vinegar from a spray bottle and leave it to sit for about an hour. Powdery mildew does not cause significant damage to the health of the tree. What is powdery mildew? Powdery mildew is a parasitic fungus known as white mold, oidium, or PM. The first thing to do to control powdery mildew during flowering is to remove infected leaves and sections of the plant. Hepa filter. To remove spores, an air purifier needs to have a HEPA filter,. In another region protection under high powdery mildew pressure was improved. . Water from below – Use drip lines or hoses to water your plants. Powdery mildew, one of the most easily recognized of all plant diseases, is characterized by the presence of a whitish, fungal growth on the surfaces of leaves, stems, and sometimes petals. 5 Gallon) - Powerful Bathroom Mold Remover Spray - Fast-Acting & Odor Eliminator. A HEPA filter. PURADIGM® technology is a new kind of purifier. Filter the intake with a Hepa filter to eliminate spores from entering room. It often starts off gray, white, or yellow and can turn brown or black. tb1234. GUARANTEED. Check the next day, then spray twice on second day,wait one day if still around repeat. NASA-based photocatalytic oxidation filter that uses the combo of UV light ith photocatalyst to create mold-killing ions. The simple answer to this question is yes, an air purifier can filter mold spores out of the air. Reapply every three days. Price: $229. Viruses are of lesser concern to most indoor growers, unless they are operating a tissue culture lab or are concerned about human health (eg. Powdery mildew, caused by Blumeria graminis f. tritici (Bgt), is a widespread airborne disease which continues to threaten global wheat production. HEPA vacuum cleaner HEPA (High-Efficiency Particulate Air) filters remove at least 99. Spraying the same mixture on plants is also a great way to prevent it in the first place. American Institute for Conservation of Art and Historic Artifacts (AIC), 1717 K Street NW, Suite 200, Washington, DC 20006 Phone 202-452-9545 Website: Filter and Sterilize Incoming Air . Air Purifiers, Filters or Air Treatment Devices: Claim to reduce microorganisms, unqualified organic. The best type of air purifier for mold problems is usually one with a HEPA filter and an activated carbon pre-filter. Brush the mildew away with a soft-bristled brush, brushing vertically to avoid sending particles toward the. Mildew starts off as a downy or powdery white and often appears on organic materials, such as wood, paper, leather, textiles, walls and ceilings. Best HEPA Filter Air Purifier—Winix WAC5500-2. HEPA Air Scrubbing. Powdery mildew starts as discrete, circular powdery white spots on leaves. How to Prevent Mold and Mildew. Install air filters and UVC lights. What makes powdery mildew so vexing is that it can live inside the plant tissues. this is MOLD. The plants are grown in a tent with a fan blowing inside as well as an exhaust fan ect. Plus, it generally looks either. About Us. GermGuardian Air Purifier with HEPA 13 Filter, Removes 99. Very effective in preventing mildew from spreading. , to prevent any more water from entering and. The biggest difference between mold and mildew is how they grow. A garbage can. CleanLeaf grow room air cleaners are built to capture, control, prevent, and provide air filtration for grow rooms, greenhouses and other growing. Do not expose them to the sunlight for more than 30 minutes. 1/2 teaspoon of liquid, non-detergent soap. . Rinse the spot with water. Applied UV, Inc. Hepa filter. Powdery mildew (PM) leads to severe yield reduction in qingke (Hordeum vulgare L. HEPA grow room air scrubbers draw contaminated air through a series of high-efficiency filters where the air is cleaned and released back into the. Furthermore, the HEPA filters have been proven to eliminate up to 99. Mold spores are usually about 1-20 microns so the HEPA filter is perfect for filtering mold spores out of the air. 3 micrometers or larger. This is a very common disease of summer and winter squashes. purification. 1 1 Mycology group, Research Department Plant Protection, Agroscope Changins, Nyon, Switzerland 2 Department of. 1. Apply a spray of 1/4 teaspoon baking soda mixed with 1 quart of water. They can also aid in removing harmful particles in the air caused by smoke, which can occur in times of wildfires. HEPA filters can do a lot, but they are not miracle devices. Ionizers use negative ions to remove small particles in the air. You will see the powdery mildew spores move to the top of the water, then skim the top of the water to take the scum out. Germ Guardian True HEPA Filter Air Purifier. 3 microns This true medical-grade HEPA filter captures mold and mildew and other contaminants, protecting your crop from powdery mildew, cross-pollination and more. The mixture raises the pH level of plant leaves. HATHASPACE’S MODEL uses medical-grade H13 HEPA filtration (instead of the more. If you discover powdery mildew on your plants, it’s best to remove infected plants and discard them immediately. Powdery Mildew. 00. Mildew contamination on or in books, magazines, photographs or other paper products should be called mold. , to prevent any more water from entering and causing mold problems. Powdery mildew can lead to bud rot which is the weird colored buds. UV light (in limited exposure) via a handheld light can also be directed at plant surfaces and leaves in order to deactivate/kill Powdery Mildew. Alen’s True HEPA filters capture at least 99. The ideal air purifier for your grow room attacks these diseases and eliminates them from the air. mangiferae is found in all areas where mangoes have been raised long term, but is particularly. This article explains the difference between mildew and mold and points out why that distinction matters to paper conservators and book restorers. 97% of as small as 0. 00; Filter(s): Pre-filter, True HEPA filter, active carbon filter; Recommended Room Coverage: 326-788 square feet;Powdery mildew is a white, barrel-shaped pathogen caused by fungi called Ascomycetes, belonging to the Erysiphales order. HEPA filters capture 99. It serves as a model system for studying biotrophic pathogens. Its high pH makes it effective at treating and preventing powdery mildew, as it renders a plant’s surface too alkaline for the spores to thrive. If you have a sealed grow room, and you have an air intake system, be sure to use an intake HEPA filter to prevent contaminants like powdery mildew from entering your growing space. Tebuconazole. The VEVA ProHEPA 9000 Air Purifier is one of the most powerful air purifiers on the market, with a CADR rating of 135 cfm. 1. Charged particles created by our patented components simultaneously attack pathogens in both the air and on surfaces. 4 Use HEPA filters and sterilize airflow. Uvonair 10" CD In-Line Duct Ozonator - 2 Cells. How can it be made usable? This seems like it should work: 1. Powdery mildew is a common fungal disease of lilacs. Mold is usually fuzzy and raised above the surface that it is growing on. They are also the only mold mask approved by the. The Winix WAC5500-2, an update to the WAC5500, includes a carbon filter and HEPA filter to improve air-flow and remove allergens that occur from things like pet hair, pollen, dust mites, cigarette smoke,. At $895, it is a significant, but worthwhile investment to help you maintain a powdery mildew-free home grow. AHPCO filter. Spray the plants during sunlight hours, preferably in the morning. Make a house rule that forbids food in bedrooms, so your kids don’t end up attracting pests, getting sick, or creating a very stinky kid cave. Over time the spots will expand and may grow together, causing large blotches of diseased plant tissue. They effectively eliminate mold spores, powdery mildew, viruses, VOC’s, odors and even sub-micron particulates, preventing any microbial contamination of your final product. Cough and postnasal drip. Note that the size of mold spores is also 1 to 30 microns, so a good air purifier will be very effective. The disease management can be partially achieved with the application of fungicides. The reason I chose the Aeramax 300 as one of the top mold killing purifiers is due to the AeraSafe antimicrobial filter. The disease first appears as a faint white fungal layer on maturing. This air purifier for mold and mildew offers 3 powerful air cleaning layers, including a medical grade H13 True HEPA filter. Abstract Powdery mildew fungi cause severe diseases in many agricultural plants, such as the. If the mold spores aren’t visible with the naked eye, you can take a look under a microscope, a jeweler’s loupe, or a magnifying. True HEPA Filter – The most used air filter with powerful filtration process to capture up to 99. 6. SKU #: OA1200PACM-230-701. This both treats existing powdery mildew and protects the plant against further infection. This makes the plants more immune to this fungus. Reduces odors from pets, cigarettes and cigars, cooking, and mildew. Baking soda is not the best way of treating powdery mildew but can work well as a preventative measure. 97% and 99. Powdery spores are produced that spread to other parts of the plant or related plants. It occurs following warm days and cool nights with high relative humidity often seen in the spring and fall. Powdery mildew is a bit more difficult to spot since the fuzz looks similar to kief and resinous trichomes, and if that’s the case then move on to the next step; Check with a microscope or a magnifying glass. 99% of particulate down to . 99% Efficient High Capacity HEPA Filter. 1), and powdery mildew covered between 10 and 35% of the foliar surface (visual estimation) at the time of the experiment. 95. That disqualifies most air purification systems that rely on filtration since most, if not all, spores will pass through the filter. Of course smoking mildew-contaminated marijuana is harmful. This will help prevent the fungus from spreading. With that said, not all air purifiers are equipped to do this. Get AiroClean420 Pricing. A HEPA filter such as the 6″ Phat HEPA filter ($130) provides maximum filtration. At this time of the year, most shoots have already stopped growing and temperatures in central Washington become unfavorable for powdery mildew. All air purifiers. Early Black Friday Deals. Mean temperature of 68-80°F is favorable; infection can occur at 50-90°F. The best air purifiers for mold. Powdery. With a 4. Whole house air purifier - AS-550 HEPA air purifiers remove harmful airborne particles including asbestos, mold spores, mildew, smoke, pet dander, pollen, saw dust, and other miscellaneous debris. . Rinse the spot with water. Host resistance is the most effective and economical means to control this disease. 97% of pollutants are killed. Make sure all gutters and downspouts are working correctly. Make a neem oil spray by combining 2 teaspoons neem oil, 1 teaspoon liquid dish soap or Castile soap, and 1 quart (1 l) of water. Also, insects such as wooly aphids can spread the infection by feeding on the plants. Follow these six tips to prevent moisture buildup and mold in your crawl space. SKU: VNT-GB-HF-B. Unlike non-HEPA vacuums that can send out even more spores into the air and risk spreading them on food. To gain genomic insights into the underlying obligate biotrophic mechanisms, we analyzed 15 microbial genomes covering powdery and downy mildews and rusts. Applications. This filter ionizes air particles like mold and mold spores and additionally removed up to 99% of all air particulates. Short answer: Mildew is just a different type of mold. Inspect the book pages, looking for spots or residue that may be mildew. Baking soda has 1000 uses and killing powdery mildew is just one of them. Spray the mixture onto the plants every two weeks. To avoid damaging your grass, test in a small patch first before using it across your entire lawn. A cleaning solution such as hydrogen peroxide, bleach, cleaning salts, or vinegar. Care must be taken to assure that the filter is properly seated in the vacuum so that all the air must pass through the filter. The symptom of powdery mildew is a grayish-white, powdery mat visible on the surface of leaves, stems, and flower petals. High. Odors also cause issues for nearby neighborhoods, buildings, offices, and more. Carbon Filters & Odor Control /. 4. Mix some baking soda with water and spray directly onto the white leaves. Use hand sanitizer frequently. Based on the morphological and molecular analysis, we identified T. DIY grow tent air intake filters are cheap to make, but they can’t stop finer particles as effectively as HEPA filters. Dual-layer design keeps contaminants out with minimal airflow restriction. Agriair 1200PAC Air & Surface Purifier, 230V. However, powdery mildew, caused by Podosphaera physocarpi, can severelyaffect ninebark, deteriorating the ornamental value and making them. Even if the mildew seems to be gone, it is probably still growing beneath. 7% of all mold spores from your air. A high level air filtration system with a MERV (Minimum Efficiency Reporting Value) of at least 16 will remove most spores from the air. From $140. Environment /. 5. 6. True HEPA filters are the best way to clean the air of mold. These spots increase in size and run together to form a whitish, powdery growth, gradually spread over a large area of the. 2, Tran M. 778 ° C), the fungus will be in action. Pour the mix into a sprayer, and evenly coat all areas of the plant, including the underside of leaves and stems. These sturdily designed filters offer 3 layers of protection with a high-efficiency purification rating of up to 99%. Because powdery mildew and other infections such as fungal spores spread easily via airflow and ventilation, UV air-filters can be an extremely helpful tool to prevent the spread of these diseases. Not all mold problems require demolition. Steps for Painting Aluminum Siding. Mildew usually looks white or gray and dry, or even powdery. A HEPA filter is a high efficiency particulate air filter, designed to remove 99. It will become dormant and turn into a powdery substance. Between the array of filters, up to 99. Progress curves of wheat powdery mildew epidemics on plant density 1 (60 kg seed/ha) (A) and density 2 (120 kg seed/ha) (B) with. Dispensaries, light odor . Here are the best ways to kill powdery mildew on cannabis plants during flowering, and to control it so it doesn’t return. Application: Make a 0. Gutters and downspouts should escort water away from the house so it doesn’t accumulate near your foundation and end up seeping in your crawl space. Best for basements: NuWave OxyPure Smart Air Purifier. A vacuum cleaner with a HEPA filter. It also occurs when there is overcrowding of your marijuana plants at the grow site or in the grow room. The HEPA standard is set by the U. 6% correct rate of testing pictures showed that. $141. Completely cover all HVAC supply and return air grills in the construction area and surrounding hallways to pre-vent contaminants from entering the HVAC systems. Also known as sodium bicarbonate, baking soda is a common remedy for powdery mildew. Follow instructions on the label. Douse plants thoroughly, making sure to soak the underside of leaves. Symptoms: leaves change color (red, purple, or bronze) prematurely (summer); leaves may have brown edges/wilting; peeling, cracked bark near the base of the tree. Spray the plant thoroughly, saturating both the tops and bottoms of leaves. Multiple panels of pleated media . For an extra kick of potency, add ½ tsp of liquid soap. However, water in the air (humidity) is necessary for the spores to germinate. tb1234. Rabbit Air MinusA2. roseum as a mycoparasite on colonies of the wheat powdery mildew. Most respirators, even the disposable ones, come with exhalation valves. Best Design: Germ Guardian True HEPA Filter Air Purifier. 2 tbsp pure hydrophobic neem oil. One option that is certified organic is the potassium dicarbonate spray Mil-Stop that is available from Arbico Organics. HEPA air purifiers are used by mold specialists in the cleanup of toxic mold since true HEPA filter fibers can remove 99. 1. Inspect and change filter frequently. Open the book's front cover and brush or vacuum away any evidence of mildew on the inside of the cover. Up to 97% of airborne mold and mildew spores are destroyed before they have a chance. Also, a range of value pack sizes (2-count, 4-count, 8-count and 16-count) are available to accommodate. The very. What Is Powdery Mildew? Powdery mildew can be caused by many different species of fungi, although the most common in cucurbits is Podosphaera xanthii. 99. Powdery Mildew spores’ range in size from 1 to 10 micron; Botrytis spores’ range in size from 2. Improve air quality in the grow room with GrowBright duct filters. Like mold, mildew grows from microscopic spores that move through the air. . 00. 3. The AMX HEPA Filter Box is a great way to purify the air from various forms of germs and bacteria when using. 97 (50%) SKU: VNT-GB-FF06. This can help reduce odors and make the air seem fresher. 97% HEPA Filter. Take care to not make the mixture too strong, as the acidity of the vinegar can burn plant leaves. To be clear, pests, mold and mildew can. 6 Test and/or quarantine clones. Mildew is a downy surface growth that is often found on the surface of vegetables, fruits, or plant materials. Don't smoke those. A mold ( US, PH) or mould ( UK, CW) is one of the structures that certain fungi can form. 3 microns in size that pass through it. The Shark™ Air Purifier 4-Fan Anti-Allergen HEPA Filter with Advanced Odor Lock captures 99. it’s essential to sterilize incoming air. Air must be filtered then sterilized at all times. Both for outdoor and indoor growing settings, HEPA filtration is required with all airflow. Milk contains “good” bacteria that make it a very effective preventative for powdery mildew. Leaf and stem blight. Powdery mildew can affect all above-ground parts of bean plants. Anthracnose. We are a revolutionary leap in active air and surface purification that is safe to use 24/7 in occupied areas. 3 micron particles. This method can be used on cucumbers, lettuce, melons, pumpkin, and squash. BEST. 3 micron efficiency, wood or metal; Economical to Operate – uses standard size HEPA filters, 12” Quality Metal Cabinets – smooth surface for easy cleaning, easy maintenance; Safe to Operate – tested to comply with UL and CSA electrical standards and OSHA; Optional AccessoriesPowdery mildew control: One of the most common fungus issues that indoor growers deal with is powdery mildew. Inspect and change filter frequently. 3 microns This true medical-grade HEPA filter captures mold and mildew and other contaminants, protecting your crop from powdery mildew, cross-pollination and more. Other resources applicable to wood products recommend that mold be removed or cleaned with commercial mold/mildew removers, following the manufacturer’s directions, or with a solution of one part household bleach (5 percent sodium hypochlorite) mixed with three parts warm water. Powdery mildew, caused by Podosphaera xanthii, is a devastating disease that can wipe out a cucumber crop in optimal weather conditions. Should be changed every 6 months to 1 year. Prefilter to extend HEPA . For many air purifiers, staying at the top of the market for years is difficult, but not for Winix.