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Made-to-Measure filters : We manufacture all custom filter sizes. Contact us! 1-800-808-0496
Made-to-Measure filters : We manufacture all custom filter sizes. Contact us! 1-800-808-0496

How to Replace an Air Exchanger Filter

Choosing the Right Replacement Filter

We can supply replacement filters for all models of air exchangers on the market.

The best way is to call us or email us specifying the name of the manufacturer (and model) of your air exchanger. We will then be able to give you the best options to replace the filters of your equipment.


Independent professionals recommend changing ventilation filters at least every 3 months.

Energy Star recommends checking filters each month; particularly during the high season (summer and winter are both high seasons if air conditioning and heating are used). If the filter looks dirty after a month of use, it should be replaced.

A dirty filter will slow airflow. This means more energy will be required to heat or cool. A clogged filter can also cause some parts of air conditioning systems to freeze.

A clean filter will prevent the accumulation of dirt in the most vulnerable areas of your ventilation system. This means that in the course of years your system will need less maintenance and costly repairs.

Particular conditions may require more frequent replacement. For example:

- When the house is located near a highway

- When people in the neighbourhood use wood stoves and fireplaces

- In summer when blades of grass and insects clog the filters

Where to locate the filters

Before beginning, unplug the air exchanger or switch to OFF in order to cut the current.

There are two possible locations:

1) Filters located inside the air exchanger: To open the air exchanger case, please consult the manufacturer's instructions. Usually you have only to unscrew a couple of bolts to open a lateral panel to access the inside of the machine.

2) Filters located under or inside the indoor and outdoor grilles : In some ventilation systems, filters are located behind the grilles that aspirate air. Fresh air grilles are located outdoors, while stale air grilles are usually located in bathrooms, kitchens, etc.

How to measure a filter

If you already have a filter, you only have to take its dimensions.

IMPORTANT: Stock filters are usually identified by their nominal dimensions. In fact, the real physical dimensions of filters are about ¼" less than the advertised nominal dimensions. Please take this into account when ordering. In the case of filter thickness, the nominal dimension is the same as the real dimension.

How to install the new filter

Some pleated filters have an arrow indicating the air flow direction. Place the filter in accordance with the arrow.

Attention: Check for air leaks

Pay special attention to the airtight seal around the perimeter of the filter.

An air filter is useful to the same extent as it is airtight around the perimeter. Air always follows the least resistive path. If the filter can move in its casing, air will pass around it. Take care to secure the filter against its frame.