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How to change filter

Post created: 2013-03-28 Type of Equipment: Furnace Views: 196

This question was created on the page: https://www.furnacecompare.com/furnaces/carrier/comfort-80.html.

On 2013-03-28 JB wrote:

Below is what I found in a maintenance document for this furnace (http://www.docs.hvacpartners.com/idc/groups/public/documents/techlit/58dl-5si.pdf). It is important that the instructions require you to cut power to the furnace. Also, the location of the filter depends on whether your furnace is upflow, downflow or horizontal. If it is downflow the filters will be above the furnace cabinet in the duct. If it is upflow the filter will be below the furnace near the bottom of the cabinate.


The air filter arrangement will vary depending on the application.

The filter is exterior to the furnace casing.

NOTE: If the filter has an airflow direction arrow, the arrow must

point towards the blower.

CUT HAZARD: Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing furnaces.

1. Turn off electrical supply to furnace before removing filter access door.

2. Remove filter cabinet door.

3. Slide filter out of cabinet.

4. If equipped with permanent, washable 1-inch filter, clean filter by spraying cold tap water through filter in opposite direction of airflow. Rinse filter and let dry. Oiling or coating of the filter is not recommended. See Table 13 for size information

5. If equipped with factory-specified disposable media filter, replace only with media filter having the same part number and size.

6. Slide filter into cabinet.

7. Replace filter cabinet door.

8. Turn on electrical supply to furnace

Here is a chart of the filter sizes, which also lists whether they can be cleaned or need to be replaced intermittently:


Side Return Bottom Return

14-1/2 16 X 25 X 1 14 X 25 X 1 Cleanable*

17-1/2 16 X 25 X 1 16 X 25 X 1 Cleanable*

21 16 X 25 X 1 20 X 25 X 1 Cleanable*

24 16 X 25 X 1 24 X 25 X 1 Cleanable*

As with everything, if you are not comfortable working on your furnace, especially if you are not sure how to cut power to it, please hire a certified HVAC tech to do the work.

To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present.  To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.

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