When used correctly, air and HVAC filters can help reduce airborne contaminants, including viruses, in a building or small space.
Cleaning or filtering the air alone isn't enough to protect people from COVID-19. Use this tool to learn how you can reduce the level of COVID-19 virus particles during and after a guest visits your home. COVID-19 doesn't expel on its own.
It must adhere to something else to travel, such as mucus, a respiratory droplet, or a piece of dust from the environment. A HEPA filter doesn't kill the COVID-19 virus, but items that can carry the virus stick to the filter so they can't move around the living room. Appliances that use HEPA filters only work when they are turned on, so you may have to run the boiler fan continuously or for longer periods of time. Don't forget that filters must be cleaned or replaced regularly to work effectively, according to the manufacturer's instructions.
It's important to note that MERV and HEPA are two different types of air filters, although you've probably seen both related to air filtration. Only a few air conditioners can accommodate HEPA filters, and technicians must configure them correctly and replace them regularly. MERV filters with ratings of 17 or higher are comparable to HEPA filters and may be referred to by that term. Ventilate your home by letting in fresh air, filtering the air that's there, and improving air flow.
Air filters that remove small particles, such as high-efficiency particulate air (HEPA) filters, are effective in removing pollutants from the air. The most common appliances that use HEPA filters are portable air purifiers, vacuum cleaners, and heating, ventilation and air conditioning systems, such as ovens. Minimum Efficiency Reporting (MERV) filters are rated based on their ability to filter large particles (0.3 to 10.0 microns in size). Filters for residential or commercial HVAC systems are generally installed at an air inlet or outlet or inside the central air treatment unit. Because outside air that flows into an HVAC system can be contaminated, especially in metropolitan areas where buildings are in close proximity, technicians sometimes install a pre-filter for incoming air. Also consider running the system fan longer or continuously, since HVAC systems filter air only when the fan is running.
According to the European standard, a True HEPA filter will filter the air and capture at least 99.95% of particles that are 0.3 microns in size. These handy devices come with multiple filters to trap harmful particles and remove a large amount of COVID particles from indoor air. Before making any changes to the air filter of an HVAC system, users should consult their HVAC manual or an HVAC professional.