Why do heat exchangers fail?

dirty blower wheel Lennox Furnace

This is a simple example of how to destroy a furnace. Poor ducting. In this case the ducting should be changed to the correct size.

Here’s the simple version. If you’d like to learn more - watch the video.

 Lack of air flow as a result of poor duct sizing or dirty filters

1. Oversized or over fired equipment
2. Lack of maintenance
3. Poorly Engineered furnace or heat exchanger
4. Incorrectly sized or incorrectly installed or both