Originally Posted By: cpetty
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while performing a mold inspection I noticed the gas-fired water heater
venting and was concern and need some advise.The vent was single wall
venting and had a 9o degree bened 8 to io inches above the vent hood.
Then there was a run 16 ft under the sub-floor and a hole cut into the
exhaust of the furnance that with out the roof.My concern was there was nothing to pull the exhaust from W.heat out unless the heat was on.There
was aluminium tape covering a junction 4 ft from the 90 bend and tape where they inserted the 3 inche single wall flue in the heating exhaust.
Anyone with info on this.The vent should always have an upward pitch
to the outside.