The air cleaner is typically situated at the point where the return duct enters the air handler. In larger homes, it is not uncommon to have multiple HVAC systems, each of which will usually have at least one air filter. This means that your home may have air filters located in the air handling unit AND on returns. The general rule of thumb is one filter for each air handler.
Most homes, especially those with multiple HVAC systems, have more than one air filter installed. These are usually placed near the oven or manipulator of the air conditioning system and return grilles. Generally, a home will have two air filters in its inlet holes. In some cases, there may be more or less depending on the size of the house or apartment and the number of floors that must be supported by the central air system. One of the best ways to improve efficiency and extend the life of your HVAC is to change your air filter regularly.
If you're wondering: “But where is the air filter in my house?” Don't worry, we'll get to that. First, let's discuss why it's so important. All central heating and cooling systems must have an air filter, but it may be more difficult to locate in some HVAC units than in others. One-inch filters go to the wall or ceiling, covering the inlet grilles. However, the whole house filter goes in front of the HVAC unit.
The settings vary depending on the system and type of filters you use. In some cases, you may have a cartridge. At other times, the filter enters a slot. Either way, make sure to inspect your filter and your entire HVAC system for optimal and consistent results. The media filter has a high MERV rating that competes with the filtration system of an expensive high-MERV filter. The service life of filters varies, so the number of times you need to replace the air filters in the return duct compared to the air handler differs due to their different sizes.
However, the most common type of filter is not popular with homeowners due to its low filter quality. For example, the most common size filter for return grilles has a depth of one inch that is designed to hold one inch air filters. If you place furniture in front of the filter and manipulator, you risk damaging your HVAC system and having high energy bills. A professional can tell you more about where your filters are located as well as any other aspect of your HVAC system. It is also recommended by the Department of Health as it filters even the smallest particles such as bacteria.
There are several types of HVAC units and each may require a different installation for its filter. It's common knowledge that you need to replace air filters regularly; if you don't, damage and costly repairs often result from your HVAC system. However, it's also important to note that some HVAC systems, especially larger ones, may have more than one air filter and may even require different sizes in different locations.