On Noritz Tankless why can first vertical run of vent be 3' or less?

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billhayton

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Installing Noritz 931 and read the first vertical run cannot exceed 3'..if you add a horizontal section and then go vertical again that ok.

Any reason for this...does too much vertical venting cause suffocation of unit?
 

billhayton

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you guys are good...

Makes sense the condensate accumulation is not something noritz or anyone else wants running back to unit.

thanks for the posts
 
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