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Furance and Hot water tank Ventilation

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I have a fairly new house with a high efficiency furnace and hot water tank in the basement that vents through pvc pipe out the roof that is 2.5 stories above.  When those mechanicals turn on I get some cracking and creaking noises where the pvc is expanding because of the heat.  When the pvc was installed it was installed too tightly into the headers and against the 2x4s.  so there is no room for the PVC to move.  I've called some HVAC companies and they've suggested just venting out the side, even though that is against Chicago building code.  What do you think we should do?
asked in Heating System by m_nothman (120 points)
edited by darekrudy
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1 Answer

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I’m assuming the side venting would be over the walkway or other area that is not approved by code. Are you saying that side wall venting of high efficiency furnace and power vented water heater is not permitted in Chicago in general? There are several restrictions but I’ve never heard that it is forbidden.
You can try opening the wall / ceiling wherever it is necessary and try to enlarge the holes around the PVC vent. If this is not possible you’d have to reroute the vent pipe to some approved location. The noise will most likely not go away otherwise.
Just do some damage assessment and pick the least complicated way. It’s difficult to suggest anything without knowing the layout of your installation.
Please let me know if you have more questions but describe in detail the location and why do you think that you cannot vent through the side wall. How about the rear wall of this building?
answered by darekrudy (21,730 points)