Air filters help keep the air in your home clean. They do this by trapping dirt, dust, pollen, and other particles that could be floating around in the air. This can help those with allergies or sensitive respiratory systems breathe easier and stay healthy. The filter is installed inside your heating, ventilation, and air conditioning (HVAC) system. The air in your home is forced through the filter, cleaning it before it flows back out into the room. When the filter is full of dirt and particle, it should be cleaned or replaced to keep the air in your home clean.