How do I know what air filter to buy for my furnace?

First, locate the filter slot in your furnace/air handler. Some homes have filters behind their return vents as well. Furnace filter size is measured using length, width, and depth. For example, a furnace filter that measures 18”x16”x1” is 18 inches long, 16 inches wide, and 1-inch deep.

How do I know what size filter my furnace takes?

Usually, the filter size is printed along the edge of the filter’s frame. Note that the size listed in bold on the frame of the filter is the filter’s nominal size, which likely differs from its actual size.

Do all gas furnaces have filters?

Do All Furnaces Have Filters? Yes, all furnaces & heat pumps have filters. If your home uses another type of heating system, like a boiler which uses water to heat the home, you will not have filters, but for a furnace or heat pump, a filter is a vital component.

Does it matter what furnace filter you use?

Higher rated filters allow less air to flow through though and can force your furnace to work harder and possibly malfunction. A MERV rating between eight and 11 is adequate for most homes. To be safe, you should check if your furnace manufacturer has a maximum MERV rating your model of furnace can use.

What happens if air filter is too big?

If you purchase a filter that’s too large, it won’t slide into the slot correctly. If the filter is too small, it won’t cover the entire space and may allow dust and dirt to flow past.

Are all furnace filters the same size?

Typically, nominal AC and furnace filter sizes are 1/4″ to 1/2″ bigger than the actual size. Luckily, if you know your filter’s actual size, figuring out the nominal size is easy. All you have to do is round each dimension up to the nearest inch.

Where is the filter on a gas furnace?

The furnace filter is usually located inside of the blower compartment, where the return air enters the blower compartment. Most units have built-in furnace racks. The large metal furnace compartment contains a filter and blower.

What furnace air filter should I buy?

The higher the MERV rating, the more efficient the filter. The American Society of Heating, Refrigeration and Air Conditioner Engineers (ASHARE) recommends a MERV 6 or higher. Most people go with a MERV 8 filter. Most residential areas can remove contaminants with MERV 8 to MERV 13, while most hospitals use MERV 14 to MERV 20.

How to find the air filter for your furnace?

Horizontal HVAC unit – Furnace filter will be located on the intake side,slid into a rack.

  • Vertical HVAC unit with air moving upwards – You can find your furnace filter in the bottom door. This is where the blower is.
  • Vertical HVAC unit with air moving downwards – Your air filter will be in the top door,where the blower is located.
  • Should my furnace have an air filter?

    Your specific situation is unique, but most air filtration experts agree that there is a general lifespan for furnace filters. The standard recommendation is to replace furnace filters at least once every 90 days . Keep in mind, this is a general recommendation.

    Can my furnace have two filters?

    You will need to open both the top and bottom doors to get to the filter. Vertical HVAC unit with air moving downwards – Your air filter will be in the top door, where the blower is located. This type of furnace or AC unit will most likely require two filters.