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Q&A About Filters for Lennox Furnaces

Question: How to change the air filter on a Lennox Elite?

Answer: Installing an air filter is a straightforward task in most situations. See the chart below to decide which air filter to buy.

Furnace Filters for the Lennox Elite

Air Flow Configuration Cabinet Width Filters
Upflow / Horizontal 17-1/2" buy now on amazon 1 16x25x1 filter
(bottom air return)
Upflow / Horizontal 21" buy now on amazon 1 20x25x1 filter
(bottom air return)
Upflow / Horizontal 24-1/2" buy now on amazon 1 24x25x1 filter
(bottom air return)
Upflow / Horizontal All buy now on amazon 1 16x25x1 filter
(side air return)

Question: What is the right filter size for my Lennox G32Q3-75-2? Original was media filter LMF2000.

Answer: The filter you need depends on both the configuration of the furnace and the width of your furnace's cabinet. See the chart below.

Furnace Filters for the Lennox G32

Air Flow Configuration Cabinet Width Filters
Upflow 14-1/2" buy now on amazon 1 14x25x1 filter
Upflow 21" buy now on amazon 1 20x25x1 filter

Question: How often does the filter need to be replaced on my Lennox G43?

Answer: Here is a link to the Lennox G43 owners guide. On page 4 it advises you to check your filter(s) monthly. It also provides details on what filter is needed. Most homeowners are able to check the filters on their own. However if you feel uncomfortable doing it yourself, you can always hire a licensed contractor to do routine maintenance. You may want to consult with the contractor during the visit on doing it yourself in the future. 

Question: What kind and size filter do I need for the Lennox G43 furnace?

Answer: See the chart below for the filter you need for the Lennox G43. The correct filter for your furnace matches up with the width of the cabinet.

Furnace Filters for the Lennox G43

Air Flow Configuration Cabinet Width Filters
All 17-1/2" buy now on amazon 1 16x25x1 filter
(side air return)
buy now on amazon 1 16x25x1 filter
(bottom air return)
All 21" buy now on amazon 1 16x25x1 filter
(side air return)
buy now on amazon 1 20x25x1 filter
(bottom air return)
All 24-1/2" buy now on amazon 1 16x25x1 filter
(side air return)
buy now on amazon 1 24x25x1 filter
(bottom air return)

Question: What kind of filters should I use for my Lennox G50 Furnace?

Answer: The size filter that you need varies by the cabinet size of your model of Lennox G50 furnace. Choose your filter from the following chart:

Furnace Filters for the Lennox G50

Air Flow Configuration Cabinet Width Filters
Horizontal 14x25" buy now on amazon 1 14x25x1 filter
Horizontal 18x25" 1 18x25x1 filter
Horizontal 20x25" buy now on amazon 1 20x25x1 filter
Horizontal 25x25" 1 25x25x1 filter

Question: How to change the filter for the Lennox G51MP?

Answer: The filters for the Lennox G51MP are found outside of the unit. If you know the installer they should be able to tell you where the filters are located. For replacement filters see the chart below. The filter you need is based on the width of the furnace cabinet.

Furnace Filters for the Lennox G51MP

Air Flow Configuration Cabinet Width Filters
All 17-1/2" buy now on amazon 1 16x25x1 filter
(side air return)
All 21" buy now on amazon 1 20x25x1 filter
(bottom air return)
All 24-1/2" buy now on amazon 1 24x25x1 filter
(bottom air return)
All All buy now on amazon 1 16x25x1 filter
(side air return)

Question: What size Lennox G61MP furnace filter is used?

Answer: See the chart below for the furnace filters for the Lennox G61MP, to find the filter that best matches your unit match up the width of your unit to the width on the chart.

Furnace Filters for the Lennox G61MP

Air Flow Configuration Cabinet Width Filters
All 17-1/2" buy now on amazon 1 16x25x1 filter
(side air return)
buy now on amazon 1 16x25x1 filter
(bottom air return)
All 21" buy now on amazon 1 16x25x1 filter
(side air return)
buy now on amazon 1 20x25x1 filter
(bottom air return)
All 24-1/2" buy now on amazon 1 16x25x1 filter
(side air return)
buy now on amazon 1 24x25x1 filter
(bottom air return)

Question: What filter do I need for my Lennox G71P furnace?

Furnace Filters for the Lennox G71P

Air Flow Configuration Cabinet Width Filters
All 17-1/2" buy now on amazon 1 16x25x1 filter
(side air return)
buy now on amazon 1 16x25x1 filter
(bottom air return)
All 21" buy now on amazon 1 16x25x1 filter
(side air return)
buy now on amazon 1 20x25x1 filter
(bottom air return)
All 24-1/2" buy now on amazon 1 16x25x1 filter
(side air return)
buy now on amazon 1 24x25x1 filter
(bottom air return)

Question: Filter size for the Lennox GCS16.

Answer: Below are links for ordering filters for the Lennox GCS16, you just need to know the width of the cabinet. Thanks!

Furnace Filters for the Lennox GCS16

Air Flow Configuration Cabinet Width Filters
Downflow / Horizontal 17-1/2" buy now on amazon 1 16x25x1 filter
Downflow / Horizontal 21" buy now on amazon 1 20x25x1 filter

Question: How to service air filter for the Lennox SLP98V?

Answer: According to the Lennox SLP98V installation manual the filter sizes are the same ones listed in the chart below. Thanks!

Furnace Filters for the Lennox SLP98V

Air Flow Configuration Cabinet Width Filters
Upflow / Horizontal All buy now on amazon 1 16x25x1 filter
(side air return)
buy now on amazon 1 16x25x1 filter
(bottom air return)
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