Can anyone tell me if air admittance valves are permissible for secondary venting under the current version of the Uniform Plumbing Code published by the International Association of Plumbing and Mechanical Officials? Maine recently adopted these new codes so my local code enforcemnt officer may not yet be fully familiar with them.
If they are permissible, and if you're really familiar with the code, could you please cite the appropriate section(s).
Thanks very much.
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