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Tjerlund HST-1 Power Venter

RonDuch Member Posts: 3
I have a job with a problem. The customer had an old System 2000 power vented and needed a new boiler. Installed boiler in 2014 and didn't have a problem with it till May 2017. had to replace the power venter. Installed new Tjerlund HST-1 power venter. The smoke pipe is 4'' about 29' long as it was with the system 2000 and with the new boiler installed in 2014 and never had a problem. Now have a problem with fumes in the house. Checked all connections to smoke pipe they are all ok.