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· Hvac Pro
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25,125 Posts
Antisiphon air vents/open tee arrangement are ALWAYS a good idea. The suction of the air past the drain fitting can interfere with the drainage and it needs to be open vertically to prevent that.
 

· In Loving Memory
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42,671 Posts
Antisiphon air vents/open tee arrangement are ALWAYS a good idea. The suction of the air past the drain fitting can interfere with the drainage and it needs to be open vertically to prevent that.
What he said.
 
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