HEPA filters are limited to particles.
There are harmful gases and fumes that can simply pass through a HEPA filter.HEPA filters can cause air to become too dry. Finally, some HEPA filters can produce ozone, which is an unhealthy gas that can irritate the lungs. If mold continues to grow, consider using an air purifier with an antimicrobial prefilter to trap and destroy mold spores before they reach the HEPA filter.
This means it's easy to find a device that contains a HEPA filter and is labeled “absolute HEPA” or “true HEPA”. HEPA filters are generally made of borosilicate glass fibers, plastic fibers (also known as polypropylene), or fiberglass bonded together with up to 5% acrylic binder. If you want to clean the air in your home, keep reading to find out if a HEPA filter is the right option for you. HEPA filters were first used in hospitals and nuclear power plants to protect people from harmful particles and diseases in the air.
HEPA filters are manufactured by randomly ordering polypropylene or fiberglass fibers (between 0.5 and 2.0 µm). VOCs are household items, such as hairspray and ammonia, that are too small for a HEPA filter to remove. According to the EPA, HEPA filters used in portable air purifiers and in heating, ventilation and cooling (HVAC) systems can help reduce the symptoms of allergies and asthma. To reduce the spread of mold, replace the HEPA filter at least as often as recommended by the manufacturer.