Previous versions of this model line came standard with a braze plate heat exchanger because it provides a lighter unit with higher efficiency. However, braze plate heat exchangers cannot be used in open-loop applications, so the company released this coaxial version in response to feedback from installers and distributors.
from Odor Management Plan in Controlling Smoke Odor http://bit.ly/2Ii6I3T
via http://bit.ly/2R7558e
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