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Is this a packaged heat pump or split system with air handler?Model would help.Most all require a 3/4' pvc trap.
On most Nordyne air handlers, the manufacturer recommends a loop trap. See image below.However as an hvac contractor and I also sell an install Nordyne, I have never used a loop trap, but always use the running trap as shown in second link freely draining outdoors and never had an issue.
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