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jcrampton 05-01-2007 04:27 PM

vent bathroom fan to furnace vent
I am installing a new bathroom in my basement remodel and want to install a fan. Instead of drilling through the side of the house (brick) can I just connect the fan exhaust piping to the furnace vent that goes up through the roof?

NateHanson 05-01-2007 05:05 PM

Definitely not.

Keep Em Cool! 05-01-2007 07:56 PM

Of all the forums i have answered questions on, that is the dumbest request ever. Let me lay this out for you! All it takes is a snow storm. Snow gets high enough and blocks the flue discharge. Instead of the furnace's pressure switch shutting down the unit it will just pump into the bathroom fan and kill you and the rest of the family. That will leave you some legacy! Dumb idea. Just plain dumb.

mikemy6 05-06-2007 11:33 AM

Throw away youre carbon monoxide alarms too, its gonna be hard enough to get some sleep w/ the ringing headache,and sour stomach. Believe me when the heat kicks on youre gonna wanna take a nap a nice long one. Goobye!

ron schenker 05-06-2007 05:03 PM


Originally Posted by Keep Em Cool! (Post 43050)
Of all the forums i have answered questions on, that is the dumbest request ever.

:laughing: :laughing: :laughing:

pjpjpjpj 05-09-2007 12:09 PM

I agree, this is a horrible idea (I won't call anyone dumb, because, hey, some people have no idea, and it's not their fault they are not familiar with HVAC stuff.... just like I know nothing about cars).

But believe it or not, when I moved into my house a few years ago, this exact thing had been done. The previous owners had had a basement bedroom and bath finished out, and whoever did it ran the 4" flexible (wire coil in plastic) bathroom exhaust fan duct into the unfinished area, made a big loop with it (hanging down from the joists), and then added a Y-fitting to the water heater flue and tied it into that. And the water heater flue actually ran about another 5 feet after that fitting, and then widened to 6" and the furnace tied into it. Of course, this line then went another 5 feet and turned up into the chimney above, running up two floors and out the top of the chimney.

Now, considering that the previous owner's teenage son had lived in that bedroom for several years and not died, I guess they got lucky.... but it certainly was not up to code and I fixed it right away (heck, before I was able to run the toilet exhaust outside, the first thing I did was just let it blow into the unfinished area and take out the Y-fitting from the flue... better to have a little shower humidity in the large unfinished area than to risk carbon monoxide in the basement!).

jcrampton 05-09-2007 01:36 PM

thanks for the kind answers
I didn't think it was a good idea, that's why I asked.

I would have appreciated a little more politeness in your answers.

cibula11 05-09-2007 01:58 PM

No doubt. Easy on the's not like we were all born with the answers. Give the guy a break.

jcrampton 05-09-2007 02:20 PM

the only stupid question is the one not asked
By asking that question, someone else searching this forum might be saved some headaches. That was another reason I posed the question.

elementx440 05-09-2007 04:25 PM


Originally Posted by Keep Em Cool! (Post 43050)
Of all the forums i have answered questions on, that is the dumbest request ever.

and i'm sure you're of great value on "all the forums you answer questions on" calling people's questions dumb. do the world a favor and stick to those forums...


Originally Posted by ron schenker (Post 43899)
:laughing: :laughing: :laughing:

"However big the fool, there is always a bigger fool to admire him"

anyways, I went to a guys house onetime who had a hot water tank replaced a few years prior in a basement/crawlspace... well I have no idea what happened but the flue pipe was laying on the floor and had never been (I believe) reinstalled since the install. thank god for drafty basements...

mikemy6 05-09-2007 09:03 PM

I think that a place like this is great that highly skilled people would take the time to bust your balls your alive and your loved ones what do u think could happen to the people that bought your when u where dead and gone

jcrampton 05-09-2007 10:49 PM

Nice grammar. I'm not sure exactly what point you were trying to make, but thanks anyway.

mikemy6 05-10-2007 11:38 AM

..............,,,,,,,,,,,,,,,,,""""""""""""""!!!!! ,!!!!!!;;;;;;;;;;;::::::'''''''''''''''???????

omahaguy 10-11-2012 08:05 PM

Well, I had the same question and I came here to search for the answer.

I am going to finish my basement and the bathroom will be really close to my furnaces. So I too thought to myself, I wonder if I could run the bathroom vent into the furnace exhaust vent that goes from the basement up to the roof.

So I don't think it was a stupid question.

bobelectric 10-11-2012 10:21 PM

You could have a backdraft and bring co3 into the house.

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