re-routing Vent stack in attic??

[acguytx]

ok dont but my head off here but i had no choice LOL

needed to add furnace/coil that was 11inches longer than old system and the left side Rplenum is up against Roof Post, cant cut that, right side Splenum upagainst a bathroom PVC vent stack..i was forced to cut it to allow for new system so its about 6inch off set now.

Question,

do these have to be staring all the way through the roof termination or can i siply grab some pipe and 90s and re-route back around plenum..??

whats the code for this, being a vent stack doesnt seem like it'd be an issue just routing it back around given the weird way they vent some retrofits nowadays with the little deal on end of pipe..

anyway please advise..thx

[HVAC_Marc]

As long as any water inside doesnt pool anywhere you can reroute it without issue.

[acguytx]

As long as any water inside doesnt pool anywhere you can reroute it without issue.

cool so going a little horizontal to vertical back to horizontal back to vertical is ok as long as it has some fall/drop as it goes down..i saw a few like this from new construction but most go straight up..

[HVAC_Marc]

yes, that's correct. pitch is good

[Snaple4]

Try to avoid hard 90's and a 90 right off the unit if possible. Also, if you are adding fittings you may end up increasing the pressure drop past the acceptable range of your current pipe size. In the manual for the furnace they usually give the sizes required for the length run (remember a small 90 bend could actually have a large equivalent length)

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[samgevas]

Try to avoid hard 90's and a 90 right off the unit if possible. Also, if you are adding fittings you may end up increasing the pressure drop past the acceptable range of your current pipe size. In the manual for the furnace they usually give the sizes required for the length run (remember a small 90 bend could actually have a large equivalent length)

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I think he is referring to an ABS sewer vent, Not a flue for a 90% FAU. (said it was from a bathroom)

OP, in either case 45°s and sweep 90°s are much preferred to hard 90°s.
And if it is ABS(the black pipe that looks like PVC), then you need to make sure and use ABS pipe, fittings and glue. Regular PVC on ABS is a no no.


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