Intertherm M3RL series 90+ Downflow

Questions about repairs and parts for Nordyne furnaces, air conditioners and heat pumps for manufactured homes including Intertherm, Mac and Miller brands. Click here for Nordyne parts.

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Intertherm M3RL series 90+ Downflow Furnace.

I want to add a whole house humidifier to this furnace. It looks to me as if a return air bypass version, such as the Aprilaire model 600A, is my only option, but frankly I know nothing about this. I need knowledgeable advice. My biggest concern is if it is possible for a humidifier to be installed. See pic of the top of my furnace.

Ideally, this would work with my Ecobee 3 thermostat as the humidistat.
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Joined: Wed Feb 20, 2019 5:42 am

I think I know what will help you. I have encountered a similar problem. Look through the information here, all the details for each of the devices are listed.
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