venting out of a bathroom exhaust and kitchen range hood

[apartmentblower]

hi,

my new setup:

1 room with 8x600w lights, aircooled

right next to that room is a bedroom with an open window

window box a/c drawing fresh air from bedroom w/ open window, exhausting hot air out either bathroom vent or kitchen range hood

air cooled lights drawing fresh air from bedroom w/ open window, exhausting into either bathroom vent or kitchen range hood


any comments on how to accomplish venting into the above, is it even possible to push that volume of air through without something going wrong?

i just had a thought, that the bathroom vent is probably only 4 or 6", definately not the 8" i need... i wonder if this setup is possible?

 

[geopolitical]

I've done a bathroom vent, but this house is a good 60 years old and my bathroom exhaust was 8" ducting in a strait run to the roof so zero impediments to airflow (boy you should have SEEN the pain it was to replace one of them). I've seen some bathroom vents that were as small as 2.5" ducting. Your best option is the one that . .

A. Exits the building fastest (some apts share ductwork, so if you leak any smells all your neighbors will know)

B. Is the largest or has the fewest turns/bends before exiting.

Most bath and kitchen fans are pretty easy to remove w/o having to remove the entire housing or range hood while still having access to the ducting directly. This may vary on where you live and what the building standards are there.

 

[apartmentblower]

I've done a bathroom vent, but this house is a good 60 years old and my bathroom exhaust was 8" ducting in a strait run to the roof so zero impediments to airflow (boy you should have SEEN the pain it was to replace one of them). I've seen some bathroom vents that were as small as 2.5" ducting. Your best option is the one that . .

A. Exits the building fastest (some apts share ductwork, so if you leak any smells all your neighbors will know)

B. Is the largest or has the fewest turns/bends before exiting.

Most bath and kitchen fans are pretty easy to remove w/o having to remove the entire housing or range hood while still having access to the ducting directly. This may vary on where you live and what the building standards are there.

i edited my OG post so i hope it didnt confuse you


yes, im a bit concerned about smell but being a sealed window a/c it should not exhaust much smell if any.

its a very old building and its right on the outside corner so im hoping its at the end of the ducting line.
my other option is drawing and exhausting from in the walls... have to research more


thanks

 

[geopolitical]

6" should work assuming it's not a big run, 4" is pretty marginal esp if you're reducing down from an 8" setup. You can always slap some inline fans on the ends of your runs to help push the air through. Never done 4", I have done 8 to a 6" duct run of some length without any major issues.

If you're really going to have heat issues you can improve your systems efficiency by making sure every last air leak is taken care of and then insulating your duct runs as much as possible. They make insulated ducting or if you're using solid duct you can wrap it with a jacket.

Your other option is a water cooled A/C setup that puts the heat down the drain.

 

[cali mike]

Be careful if you live in a building where the exhaust vent is a branch on a multi-branched exhaust line. We lived in such a building, it had a small collector fan on the roof that was supposed to provide negative pressure on everyones line, with the fan in the individual unit's kitchen hood being a booster.

Well, it never worked as well as the engineer intended, whenever my neighbor decided to fry some chicken my place reaked of fried chicken (not that I have anything against chicken, but when your not invited...) until I turned on my individual range hood fan to clear the small. So I am thinking... that if I can smell my neighbors chicken, he can probably smell my OG...

So the solution was instead to use the passive fresh air vents we had in our walls. Our building has these to allow fresh air in the apartment if the windows are closed, due to the negative pressure by the aforementioned roof exhaust fans, there is always a negative pressure.

We had a sheet metal friend construct some manifolds that allowed us to hook up some 6" ductwork and Vortex fans to the fresh air vents... and we used one as an intake, the other as an exhaust.

This system bypassed the chance of blowing delicious smells into our neighbors apartments and provided more than adequate air circulation for our ladies.