When it comes to selecting the right filter for your HVAC system, there are a few factors to take into account. Fiberglass air filters are the most economical and least taxing on air conditioning systems, but they don't do a great job of keeping out dust and other small particles. If you or someone in your family has allergies or respiratory issues, this type of filter may not be powerful enough to provide relief. It usually has a MERV 4 rating. Other common air filters include polyester filters and ultra-efficient HEPA filters.
As a general rule, pleated air filters and boiler filters should be changed every 90 days. But how often should you replace the air filter? It depends on the type of filter you have. Ovens that use this type of filter must be changed every month for proper maintenance. The MERV rating measures how well the filter prevents dust and other contaminants from entering the air stream. A filter with a 4 on the MERV scale will filter things like dust, pollen, moss, paint, and fibers, while an 8 will filter mold spores, dust mites, and pet dander.
If you buy a filter that is “close enough” to what your system needs, dirt and dust can escape through the vents through the holes and gaps between the air duct and the filter. In general, filters with a MERV 16 rating or lower are suitable for residential, commercial, and general hospital use. Pleated material filters have a MERV rating that ranges from 5 to 13, which means they can trap mold spores and pet dander. If you want to buy a MERV filter higher than the one recommended by the manufacturer, you run the risk of burning out the fan and heat exchanger of the air conditioning unit. One of the most important steps you can take to ensure your air conditioning system is properly maintained is to change the air filter regularly. HEPA filters are too strong for some air conditioning systems due to their strength; they have to be large.
These particles are trapped in the filter to prevent them from being recirculated throughout the house.