Rinnai ES38P vent extension help

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Garye5007

Member
Aug 29, 2019
14
Connecticut
I’m trying to install event extension on a
Rinnai ES38P wall unit I have was supposed to be the correct part. FOT-102 I chatted with.Rinnai and they said it should fit on the vent pipe on the back of the heater. I can’t for the life of me figure out how this fits on without some other parts. it doesn’t fit like the regular vent pipe that goes straight through the wall. I have the manual and it’s very unclear. has anyone else hooked up the vent extension on one of these units? I’ve installed one of the straight through the wall units, but the extension got me stumped. any help would be very greatly appreciated!