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The return vent pvc mod is done on the inside (ceiling) not on the outside unit. Remove the grills on the returns (2 for each A/C) and insert the pvc pipe. Be sure to smooth the edges of the pipe before inserting so they don't damage the inside of the duct.
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2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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