HEPA air purifiers are most effective when they are close to the source of aerosols. Research suggests that portable HEPA air purifiers can reduce exposure to SARS-CoV-2 aerosols indoors, and that greater reductions in exposure occur when used in combination with universal masking. The Centers for Disease Control and Prevention (CDC) also recommends mechanical filtration as a method to eliminate COVID from the air. This method works by using filters that are capable of capturing virus-sized particles and removing them from the air.
Far UV radiation could be an effective way to disinfect air and surfaces, without some of the safety precautions required for standard UVGI. Studies show that some smaller particles may stay in the air longer. If air currents from the room's HVAC, or even the make-up air from the windows, flow directly over this monitor location, the corresponding concentration measurements will be artificially low. The Clean Air Delivery Rate (CADR) reflects, in cubic feet per minute, the volume of clean air produced by an air cleaner at its highest speed.
Dry air can damage the lining of the airways and make it easier for the virus to enter. Do-It-Yourself (DIY) air filters are indoor air filters that can be assembled from box fans and square HVAC (or oven) filters. Smart Air is a social enterprise that creates simple and sensible air purifiers and provides free education to protect people's health from the effects of air pollution. The Environmental Protection Agency (EPA), American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), and CDC recommend upgrading air filters to the highest possible efficiency that is compatible with the system and verifying filter fit to minimize filter air bypass.
For more information on air cleaning and filtration and other important engineering controls, please refer to ASHRAE and CDC guidelines. The CADR program is designed to evaluate the performance of smaller room air purifiers that are commonly used in homes and offices. If you think you or someone in your household might have COVID-19, follow guidelines from the Centers for Disease Control and Prevention (CDC) for essential steps to take, including how to manage symptoms, when to seek medical help, and the right way to isolate a sick person. Ensuring adequate ventilation and outdoor air rates is a practical step in ensuring good indoor air quality.
Air and HVAC filters are designed to filter contaminants or pollutants from the air passing through them.