I am currently living in China and want to improve the indoor air-quality. We have a Hitachi R410A HVAC. All the room in the house are controlled separately. Just to make it clear up front, I am not a technical guy and have no idea about air conditioning or HVAC (just learned what a HVAC is recently while doing some research into my issue).
The air is 'fresh' from outside. Since the Pm2.5 count is very high outside, I would like to filter the air that is blown in. I was thinking of a very straightforward solution, but I am not sure if it is possible. I want to buy some HEPA filters and cut them to the right size and fix these before the A/C outlets.
Will this work? Or does someone expect the pressure drop will be too high and create malfunctions or breakdown of the HVAC?
Thanks for the replies! As requested, I added some pictures of the unit that is placed outside (pic 1 and 2), example of the vents where the air from the room is sucked in an goes to outside (pic 3) and some of the vents were the air is blown in to the room (pic 4). Each room has its own set of vents. The HVAC is central and each room can be controlled separately with a controller on the wall.
Also attached a link to the unit that we have (Hitachi multi set free, R410A, FSNQ) link to product Technical data brochure In the brochure I nowhere find any mentioneing of HEPA filters, so I guess these are not present.
Any more suggestions, thoughts about if it would be possible the attach a HEPA filter (need to think how without causing to much leakage) without causing serious HVAC malfunctioning would be appreciated.