What makes the primary heat exchanger on the GM9S96 durable?
The GM9S96 features an Aluminized Steel Tubular Primary Heat Exchanger formed using wrinkle-bend technology, which was developed to deliver extraordinary durability and long-term reliability. It is paired with a stainless-steel secondary heat exchanger for added reliability and efficiency. (Page 4)
From the official Goodman Furnace Free manual, page 4
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