Do You Know Your Filter?

There are many different placements for filters in a HVAC system. Normally there is only one: either at the furnace, or at the cold air return (where the system brings air back to itself, and is usually some form of grill on the wall, ceiling or floors). Most filters in the return have some form of a hatch to open it (usually two levers or bolts) and will simply swing open to reveal your filter. When at the furnace, there is occasionally a spot in the ductwork that was modified for the filter, a filter box located at the furnace, or in the return ductwork close to the furnace. The most difficult place to access the filter is inside the ductwork just above the furnace, which in most cases, cannot be removed without pulling off the furnace door.

Some filter placements will be easier to access than others, and it’s understandable that one may want to neglect the task of changing a filter that’s difficult to get to. That said, not changing the filter regularly can result in harm to your system as a whole— which could lead to heating and cooling functions ceasing altogether. 

There are many different types and sizes of filters, some of which are harder to find than others. However, when you know what size your filter is, you can use almost any type of filter you would like. When you start getting into higher MERV ratings (usually 11 and up) they will need to be changed more often as they catch smaller particulates and this means they will build up dirt faster.

In order to help remove allergens in the air (via a filter), you will usually need a MERV 12 or above. If that is the case, you will need to change it more often.

There are some additional reasons that you may need to change your filter more often. One being if you operate your system fan, and another would be if you have a large family or pets in the home. Further, more frequent filter changes may be necessary if you want fresh air from outside and have your doors and windows open for extended periods of time. Smoke from wildfires can also get into our homes; some homes have a fresh are intake system (on a timer) that allow outside air into the home at specific intervals, but even without that, smoke will still get inside when we are coming and going from home.

All in all, learning your furnace filter and following the tips previously mentioned to maintain appropriate replacement timing can significantly improve the overall function and lifespan of your equipment. We all want to breathe clean, and your filter is the first line of defense. If you’re still unsure about where to locate your filter, or, you just want us to take care of it, give us a call and we’ll bee right there!