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Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need. Please be patient as many times we work with several customers at once.
It does not always need a trap, no. Many techs use traps. I have not used them and have been doing installs for many years and have had no problems.
If your PVC condensate line is all cemented together, cleanouts can be helpful. Traps are not really necessary. I'm not sure where you got the noxious gas theory, but I do not use them and actually many of the techs I've worked with in the past do not either.
Perhaps this article will be helpful.
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