To a certain extent, people's fear of fresh air purification equipment is alleviated. The filter screen of the fresh air fan is one of the core components of the equipment, which filters the outside air for us. Many people want to know: can the filter screen of fresh air fan be cleaned?

How to clean the filter screen of fresh air system?

First of all, we might as well understand the composition of the filter screen of the fresh air fan. At present, most of the fresh air fans on the market adopt physical filtration, and the combination configuration of the filters is generally: primary (or intermediate) filtration, HEPA high efficiency filter and activated carbon filter. For the general home and office environment, such a combination is enough.

The primary filter screen can block dust, pollen, hair and other pollutants with large particles. HEPA high efficiency filter can effectively filter PM2.5 fine particles, allergy, dust, infection, mold spores and other pollutants. The activated carbon filter screen aims at harmful gases and odors such as automobile exhaust and industrial exhaust.

When the outside air enters the room, it is filtered and purified by layers of filters. The sanitation level is already very high, and the healthy and safe air can be breathed in the room.

Seeing that the filter screen has become dirty after several months of use, our sense of security has risen sharply, but we also want to know: can the filter screen of fresh air fan be cleaned?

Some filters can be cleaned, some can't.

The cleanable filter screen is the front filter screen of the fresh air fan, that is, the primary filter screen or the middle filter screen. How to clean the filter screen of the fresh air system? Some front filters can be cleaned with clean water or continue to use after dust and debris are sucked away by vacuum cleaner, while others can only be cleaned by vacuum cleaner instead of water. Remember to ask when you buy.

Note: even if the front filter can be cleaned and reused, it will not be used indefinitely. It also has a certain service life. When the service life is over, even if it is cleaned again, the filtering effect will be greatly reduced. **Replace the prefilter with a new one.
HEPA high efficiency filter and activated carbon filter of fresh air system cannot be cleaned and reused.
Why can't HEPA HEPA filters be cleaned?

HEPA is a high efficiency filter. HEPA filter is generally made of polypropylene or other composite materials, which belongs to paper and cannot be cleaned.

Some people may have heard that HEPA filters can be cleaned with water. This kind of filter is actually made of pet or PTFE. This HEPA filter has low efficiency and is not recommended. Secondly, the purification principle of HEPA high efficiency filter in the fresh air system also determines that it cannot be cleaned and reused. The purification principle of HEPA filter is not simply to filter out particles larger than the mesh like a sieve to purify the air, but to "stick" the fine particle pollutants through the van der Waals force between the fine particles and the filter to form adsorption.

HEPA filters are made of very fine organic fibers. As long as the fine particles come into contact with the fiber, they will be effectively prevented and will never leave the fiber surface. In addition, the particles entering the filter screen will stick to the existing particles as long as they contact the stopped particles. Therefore, after a long time, layers of particles will accumulate on the fibers of the filter screen
The HEPA filter cannot be cleaned because fine particles cannot be removed after penetrating into it. When the service life of the filter is expired and the dust capacity is capped, the filter can no longer filter pollutants and can only be replaced with a new one.

Can the filter screen of fresh air fan be cleaned? How to clean the filter screen of fresh air system? See here, you already know the answer.