Can’t find the filter on my furnace?

Where is my furnace filter?

  1. In the blower compartment (bottom door)
  2. A slide near the top of the air handler.
  3. A V shape in the upper blower compartment.
  4. A slide in furnace rack on the side of the unit.
  5. Behind a return air grill inside the home (there may be a filter behind each one)





Where is the filter in my Lennox furnace?

Your air filter is located in either the blower compartment of your furnace, in an attached filter case, or in a wall-mounted return air grille. If you cannot locate the air filter, call your local Lennox Dealer for assistance.

Where is my gas furnace filter located?

Quote from the video:
Quote from Youtube video: The case and label each one with the date you plan to install it changing the filter is easy first open or slide the door panel to get access to the furnace. You usually find the filter near where the

Where is the filter on a horizontal furnace?

Horizontal HVAC unit



For horizontal air conditioners, you’ll place your new filter in the door on the side of the furnace and air conditioner. A horizontal furnace is found more often in an attic than a basement. This heat source moves air from one side to the other rather than upward or downward.

How do I find my air filter?





Where Is The Air Filter Located In My House?

  1. Behind a register in your wall or on the ceiling.
  2. Behind a register in the floor (in older homes).
  3. On the HVAC unit near the air handler, which looks a bit like a furnace. Look for your air handler in the basement or the attic. The air filter slots into the air handler unit.


How do I remove the filter from my Lennox furnace?

Quote from the video:
Quote from Youtube video: And pull out to remove the front panel on the filter housing. This will expose the old filter to remove the filter I'll pull straight out to remove it from the housing.

Do all furnaces have a filter?

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.

How do I change the air filter in my Lennox?



Quote from the video:
Quote from Youtube video: Once you've located the cabinet remove the door. And using the tabs that are located on the end of the filter. Slide the old filter out and dispose of it. Then you insert your new air filter.

Where is the HVAC filter located?

The filter typically slides into a slot above or below the HVAC unit. Other HVAC systems – For any other kind of system, look for the air filter behind the return air grill on the wall, ceiling or utility closet door.

Does the furnace in the attic have a filter?

Here are some of the most common locations for an HVAC air filter. Horizontal units are frequently located in attics, large basements or garages. The filter usually fits in a slot on the air return side of the unit. These systems are usually found in smaller basements or crawl spaces where space is limited.

Does a wall furnace have a filter?



Since there is no filter, it is important to keep the outer grating clean and clear form any furniture. Homeowners should ensure a three-foot clearance around the wall furnace and regularly dust with a damp cloth on a regular basis, but make sure the furnace is not operating while dusting.

How do I know what size furnace filter I need?

The easiest way to find out what size filter to get for your furnace is to simply remove your current filter and look at its dimensions. These are typically printed along one of the sides of your filter.

How do I know what size air filter I need without a filter?

If the size is not clearly labeled on your existing filter, you can measure it with a ruler. Keep in mind that most disposable air filters are undercut (this is an industry standard) from anywhere between ¼” to ½”. In most cases, you should be able to use the closest standard size.

How do I know my filter size?

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.

Can I use a different size furnace filter?



The thicker the furnace filter, the longer homeowners can go without replacing it. Typically, furnace filter sizes with a thickness or depth up to one inch need to be replaced once every one to three months.

Can I use the wrong size air filter?

The biggest concern when you use the wrong size air filter is that it may not effectively prevent dust from building up on your HVAC system’s motors and blowers. This dirties up your furnace which could affect its performance or possibly harm the system’s internal components, leading to costly repairs or replacements.

Can you use a smaller furnace filter?

For most systems you can use a standard sized filter within 5/8-in smaller than the air filter housing. If you are not able to find a standard sized filter within that parameter, you will need to order a custom sized air filter.

What happens if I put the wrong size filter in my furnace?

When you use the wrong size air filter, or you install it incorrectly, the filter can’t effectively prevent dust from accumulating on the system’s motors and blowers. You’ll end up with a dirty furnace that can’t properly perform, and all of that debris could end up harming the system’s internal components.

What happens if you have the wrong air filter?



Rising Energy Bills



The wrong air filter, however, can lower HVAC efficiency and raise your heating and cooling costs. If the filter is too dense, your heater or air conditioner may have to run longer to counter the increased air resistance.