When it comes to air filters, it's essential to choose the right type and size for your vents. Pleated air filters with MERV-5 to MERV-8 ratings are recommended, and should be changed at least every three months. It's critical to have a filter in the return air outlet that leads to the boiler or to the air controller of a heat pump or air conditioner, as this will help prevent airflow obstruction. Adding ventilation filters to your home is also a great way to protect against dust and allergens, as these particles can enter the ducts through cracks and bypass the oven's main filter. Dust can also accumulate on ventilation grilles during periods of inactivity, further contaminating your home.
It's important to get the right size air filter for your system, as an ill-fitting filter can cause problems such as loose fitment, restricted airflow, and decreased longevity. Usually, the air filter is placed in the return ventilation grille so that the air conditioning system can manage clean air, free of particles and debris that could affect sensitive parts. You may be tempted to install filters in the supply ventilation grille if you have started to notice that those vents collect dust and dirt. However, since the air is already being filtered, it is not necessary to place a filter in the supply ventilation grille. This comprehensive guide explains all the reasons why you should have a return ventilation filter, what will happen if you turn on the boiler or air conditioner without a filter, and what filter options are available (with the costs).
