Need help with venting design for new grow room

MrSenator

MrSenator

Member
There is an existing exhaust duct that serves the hot water heater and the hvac heater in my basement. The existing duct is 6" - 8" in diameter and runs from the basement up through the house and out a roof vent. I believe it to be perfect for venting my grow room.

I am running into a problem designing the ducting so that the high cfm fan does not create positive pressure in the duct and push the heater(s) exhaust back into the basement. It is not really an option to vent the grow room exhaust any other way, except splicing into the existing duct.
With you help, I need to determine a way to do this while maintaining a negative pressure in the duct so the hot water heater and the hvac heater draft their exhaust correctly. :wall:

Here are a couple of set ups I have thought of so far...

Your input is greatly appreciated!!
 

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rosm187

Active Member
what about dropping the duct from roof with string attached, and tied to grow room duct pull both back up and they perform individually? if not, the directional airflow duct inside the splice area duct seems like a good idea as long as it doesnt block any movement in the main line coming up.
 
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