A filter that is too small or improperly fitted allows unfiltered air to pass through, causing dust and debris to build up in the HVAC components. The result is decreased airflow, ...

They unlatch the vent and then show off the HVAC return vent filter on camera. ... It did seem that there was some air conditioning system dissension in the comments section of her video, however.

If we were looking to buy a new filter today for our HVAC (heating, ventilation, and air conditioning) system, we’d opt for one rated MERV 13.

A dirty air filter can also result in a reduced airflow from your HVAC system. Plus, dust is a potential fire hazard, so it’s especially important to keep your furnace room clean. 10.