Cutting into existing return and supply

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  #1  
Old 08-21-19, 08:20 PM
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Cutting into existing return and supply

Hello,

I have a couple questions.
I have read that it is not a good idea to tap into an existing supply line as it will steal air from the original room, but is it okay or common to tap into a existing return line or do I need to go back to the plenum?
Is it actually against code to go into either?
I am finishing a basement and really not worried about the supply line taking too much air from the original room as it is from a very open concept area of the house and has a few other runs. It would be much easier than running a whole new line.
Thanks
 
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  #2  
Old 08-22-19, 07:38 AM
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Best practice HVAC is to go back to the main every time unless it is designed to handle both runs.
 
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