On 28/04/2018 17:46, The Natural Philosopher wrote:
On 28/04/18 17:44, Raleigh wrote:
new half bath on first floor above basement ,interior wall next to
chimney.
Toilet and small sink. Only time the fan would be used is toÂ* remove
noxious
smell from doing #2. Air ventÂ* would be 5 inches from chimney. Old oil
furnace
port capped on chimney 30 years ago in basement 5 feet under new half
bath.
Can I vent into chimney.

yes

The snag is that in many years time somebody may reconnect a boiler to
the chimney, and somebody taking a bath will get poisoned. That's not
likely in the foreseeable future, but after the house has changed hands
a couple of times ....