Furnace filters do more than the obvious job of trapping dirt and unwanted dust from coming into your furnace.  The right type of furnace filter can additionally achieve the task of trapping out particles and dust particles that are passed through your furnace and therefore end up circulating through the air that you breathe in your home. There are many different varieties of air borne particles that flow into in your home and that you breath in, these will include  things such as dust particles, pet fur, mildew spores and much more.

A furnace filter achieves a fairly simple task.  Each sort of furnace filter that you may purchase is in theory intended to do the same job of trapping all the unwanted irritants that flow into in your home.  The manner in which this works is somewhat more detailed then that straight forward description.

Basic filters are meant to trap large particles so that the air flow through the filter isn’t blocked up and their remains area for free air flow through the filter.  There are other filters that do filter out a lot of smaller air particles but the particles quickly stop up the filter leaving no area for ample air flow and this leads to the furnace having to work harder to push air through the filter. This could result in your furnace breaking down. The way to prevent this is by using a washable furnace filter and making sure to clean it out regularly.

Disposable fiberglass filters are both popular and low-cost.  The downside is that they are not very efficient.  One of the problems of those fiberglass disposable filters is that their surface if terribly limited.  Catching all the little particles would clog the filter and scale back air flow. They are good at filtering large dirt and other particles within the air however this suggests that the smaller and doubtless more serious particles to breath are left unfiltered.

The pleated air filter style provides additional surface space on the face of the filter air filter. What this means in practice is that pleated air filters will be able to trap particles of all sizes, including the smaller particles that circulate in the air in your home.

The way of rating the efficiency of furnace filters is termed MERVs.   A higher rating means more efficiency.  The measurement that the MERV system uses to evaluate filtration rates is the size of the particles in microns that the filter is able to trap.  If you want the best furnace filter for your home furnace then you should shop around for filters that have a basic MERV rating of 5 but in fact higher is better.  If the furnace filter you’re considering has a MERV rating that’s lower than 4 then you ought to think about getting at a completely different kind since this will not sufficiently filter particles from the air.

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