exhaust vent question

like many basements, the exhaust ducts from my hot water heater and furnace join together and exit together through one chiminey that goes up and out my roof. Here are my questions...

Can I vent the exhaust from my flowering room into this same chiminey and out the roof? I was wondering if it could cause a potential problem with the exhaust from the furnace or hot water heater not exiting properly. I will also incorporate a fan that blows pushes the air from the flowring room into this duct.

If so, does the duct from my flowering room need to join into the common chiminey above or below where the furnace and water heater ducts enter into the common chiminey. Or does it not matter...

Will one standard duct (like an a/c duct) be enough to properly vent my flowering room? My room is about 7x15 feet and has three 4x4 table with 16 plants each. I will be using fans together with the exhaust duct.

Lastly, will this exhaust system prevent any skunky smell from the flowering room? All my exhaust would be vented through my roof... will that be enough to prevent smells or do I need to also include a carbon filter?

Thanks in advance.

it could be enough to hide the smell by dispersing the odors above your home. i would still add a small carbon filter just in case. also why dont you run the hot water heaters exsaust to your flower room? great source of co2.

I would be nervous to do that, I think. I'm not trying to get carbon monoxide poisioning. I have no idea how to figure how much co2 can be neutralized per plant. Is there a formula for something like that?

growgurl said:

I would be nervous to do that, I think. I'm not trying to get carbon monoxide poisioning. I have no idea how to figure how much co2 can be neutralized per plant. Is there a formula for something like that?

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Co2 is carbon dioxide.... and unless im extremely unaware it wont kill you unless your ONLY breathing it.

Carbon MONO(1)oxide will thats what comes from your car exhaust.

Astaldoath said:

Co2 is carbon dioxide.... and unless im extremely unaware it wont kill you unless your ONLY breathing it.

Carbon MONO(1)oxide will thats what comes from your car exhaust.

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Carbon monoxide is produced when natural gas or propane or gasoline etc. is burned. This is why there is exhaust on the furnace and hot water heater.
If you vent this into your house you will die during your sleep.
Carbon dioxide (CO2) is what your plants breath.

I was thinking that my hot water heater and furnace gave off carbon MONOxide... which I want to make sure vents out of the house correctly. They don't release carbonDIoxide, do they? The suggestion to vent that INTO the flowering room isn't beneficial, is it?

either way, i cant see the benifit from venting light hoods out a dedicated furnace/h20tank vent. theres building codes for furnace vents and h20 heaters. there made to have dedicated vents. follow the same vents out the ridge, but cut another hole and dedicate some lines out. all i can reccommend from my experience. i have over 4 holes cut in my ridge just for venting purposes. i dont even like to combine veg room /budd room exhaust lines to avoid using T's for back pressure down the vents, which ive seen happen when 1 exhaust is on vs the other. .. .

ohh and by the way im not gonna claim my op to be smell free by any means. but with over 200 plants i have virtually no odor with no filtering or ozone generator no more. no reccommending this approach either, but you would be amazed at how little smell there is when venting out a ridge. . .

hellbelly said:

Carbon monoxide is produced when natural gas or propane or gasoline etc. is burned. This is why there is exhaust on the furnace and hot water heater.
If you vent this into your house you will die during your sleep.
Carbon dioxide (CO2) is what your plants breath.

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Thanks hellbelly for taking the time to warn him/her of the DEADLY outcome of fartin' around with gas exhaust. +rep. Both CO and CO2 are byproducts of burning natural gas.

Venting stank outdoors is still stank. I have walked down the streets of Sara Palin land and can plainly smell grows!! That is how half of the people in Alaska get caught....stink!!

LP gas or propane exhausts carbon dioxide... CO2 generators burn propane...

you can get an internal heater that works off a propane tank that is safe to use in a tent or camper or house...

stop telling people the byproduct of burning LP is carbon monoxide... it's just not true

EDIT: still not suggesting you pipe it into your room... just stating that the information above is false

Propane undergoes combustion reactions in a similar fashion to other alkanes. In the presence of excess oxygen, propane burns to form water and carbon dioxide.
C3H8 + 5 O2 → 3 CO2 + 4 H2O + heat Propane + Oxygen → Carbon Dioxide + Water When not enough oxygen is present for complete combustion, incomplete combustion occurs when propane burns and forms water, carbon monoxide, carbon dioxide, and carbon.
C3H8 + 3.5 O2 → CO2 + CO + C + 4 H2O + heat Propane + Oxygen → Carbon Dioxide + Carbon Monoxide + Carbon + Water
only in poor conditions will burning propane cause CO production... and I'll bet the furnace pull it's intake from outside

I actually just finished my vent. I have 4" b-vent for gas appliances going through my roof just for my hot water heater. I added a TJERNLUND HS1 power venter here: http://www.patriot-supply.com/products/showitem.cfm/5115 its rated at 500 degrees. Then added a tee and vented my hot water heater into the tee and at the bottom vented my flower exhaust to the bottom of the tee. Just make sure the blower is sucking both exhausts so you dont have any back feed to the hot water heater causing carbon dioxide build up. I also added a barometric damper at the hot water heater so when its not burning it automatically closes. when the hot water heater fires it opens. At 4" im able to pull 158 CFM at 0" static pressure. This works great!!

I wouldnt do this if you werent comfortable with exhausting appliances. I own a HVAC, plumbing and electrical company so i have the knowledge. I can take pictures if anyone wants to see. I wired the venter on a variable speed switch so i can control when its on and how fast its pulling. Important thing is the hot water heater vents fine with or without venter.

P.S. to above statement, you are right. Carbon monoxide is giving off when the flames are impeded. Meaning if the flames touch anything it produces CO. All appliances dont burn 100% perfect, so there is some carbon monoxide but not very much. mostly carbon dioxide, which could suffocate you.