Venting range hood under covered open-walled porch?
I’m doing my obsessive research mode about venting before our hvac is installed next week and I’m having trouble making a final decision. We have an off-grid house, single pitch roof with a vaulted ceiling. Our kitchen abuts an exterior wall and this wall is under a covered porch (see plans). I want to vent a range hood and it’s most efficient/simplest directly through the back wall, but since that’s under a covered (open walled) porch it will introduce moisture up to the roof assembly through the 2″ roof vent which starts back there. Do you think it would be ok if the range hood exhaust terminates 4 feet below the roof vent under this long overhang?
The other option would be to go up through the roof trusses to side wall, which decreases efficiency of fan with the long run and takes 7″ of insulation out of our roof along the vent pipe. A last option would be to install a low watt wall mounted ERV behind stove instead -which we can always do but I’d like to try a range hood first (ERV complicated and expensive). We get insulation soon, so now is the time to run the exhaust pipes through roof trusses if I’m ever going to do this. It would be so much simper through back wall with the covered porch.
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