Concentric vent question

[tricountytrail]

Concentric vent question.
So I'm adding a over hang and would like to add a 90 to the exhaust and bring it down so I can finish the overhang ceiling (see red arrow in picture). I would leave the original vent and add a furnco a 90 and about 3 foot to bring it down. Any issuses with this idea??
https://www.garagejournal.com/forum/attachment.php?attachmentid=1040362&stc=1&d=1597067912

 

[purediesel]

I'm sure by code you can not bring that down, you must go up through the overhang.

 

[tricountytrail]

It will still be to code.


https://www.garagejournal.com/forum/attachment.php?attachmentid=1040513&stc=1&d=1597097833
https://www.garagejournal.com/forum/attachment.php?attachmentid=1040514&stc=1&d=1597097833

 

[Jackfre]

One of the benefits of concentric venting is the balanced nature of the air flows. Exhaust and comb air have the same pressure drop balancing the flow. It is possible that additional pipe on o the exhaust may be enough o trip the pressure switch.

 

[tricountytrail]

One of the benefits of concentric venting is the balanced nature of the air flows. Exhaust and comb air have the same pressure drop balancing the flow. It is possible that additional pipe on o the exhaust may be enough o trip the pressure switch.

It should be fine the heater is has about 4' of run before it goes in the concentric vent. adding a couple feet to the exhaust side should be fine for the flow.