Noob here and attempting to learn. I would not know what an OAK looks like if it hit me over the head. About to purchase the Enviro M55 cast and now attempting to learn installation techniques. I will have a professional do the installation, but I want to learn so I know the installer is doing a good job. I will more than likely buy an OAK because of all the chatter on this site about the kit and how it effects air quality inside the home.
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