professordave
Member
Greetings one and all. Question about fan placement, ventilating the grow room and cool tube/Air Cooled hoods.
I have a 12 X 6' room (72 Sq Ft and about 720 Cubic Feet) with 3 1,000 watt bulbs burning bright. Needless to say the temps have been in the 90's....BUT the Cool Tubes are finally here! I have 2 - 6 inch tubes on ebay:
(http://www.ebay.com/itm/171174248258?_trksid=p2060353.m2749.l2649&var=470306040572&ssPageName=STRK:MEBIDX:IT)
and the 3rd is in an air cooled hood with glass (which I will hook up along with the cool tubes).
The cool tube and room ventilation systems are separate.
I have a 25' 6 inch aluminum flex duct tube which I plan to run from the outside wall to inside the grow room, and up to the first cool tube light. The next 2 lights (2nd cool tube and then air cooled hood) will be hooked in series with the air exit into the next room. The 25 foot tube from the outside to the first cool tube is pretty straight but when connected in series after the 3rd light, the vent tube has to loop back over the top of the lights and then drop down to the floor to exit the room.
Fans:
1. 600 CFM ($200) very strong 6 inch inline fan,
2. 240 CFM ($100) medium strength inline fan,
3. Several 6 inch "air booster" duct fans from home depot.
Points of Ventilation:
1. 4 inch tube in roof which is slightly obstructed by a vent
2. 25 foot flex duct to an outside wall
3. Adjacent Room
For Cool Tube/Hood Ventilation, my plan is to put the 600 CFM fan on the outside wall and blow the cold air through the 25' Duct into the first cool tube, then the second cool tube and finally the hood. As I said, the exit tube makes a 180 degree turn and then another 90 degree turn before it exits the room so I plan to put a 6 inch Air duct booster fan a couple feet past the bend.
For room ventilation, my plan is to put the 240 CFM fan blowing outside the room (no duct) directly into a carbon filter (a 35 gallon plastic container with a furnace filter sealed on top and topped with activated charcoal). One of the 6 inch duct fans will draw cold air directly from another ventilation tube in the roof-but this is only a 4 inch tube.
Question: Do you agree with my proposed placement of the Fans for optimal cooling/ventilation?
We have considered several configurations.
1. We could ventilate the tubes (rather than the room) with the cold air directly from the 4 inch ceiling tube and blow the hot air directly out of the room using the big fan. However, this would require 4 inch-6 inch reducers/expanders and I don't think this works optimally.
---HOWEVER, it is only a couple of feet vs. 25 feet of fairly straight 6 inch duct. It would also require us to ventilate cool air into the room from that 25 foot tube but we could use the 240 CFM inline fan and 1 (or more) 6 inch duct fans. Which is better?
2. Blow Cool Air or Suck Hot Air? We could also put the big fan just outside the room at the exit, sucking hot air from the cool tubes and drawing cold air from outside down the 25 foot tube and over the cool tubes. We would put a 6 inch duct fan near the outside wall where the cold air is being drawn?? I rejected this provisionally because I am not sure the cheap duct fans can handle freezing cold air (and because it is better for the expensive fan to blow cold air rather than suck hot air).
Thoughts, ideas? What say we all?
I have a 12 X 6' room (72 Sq Ft and about 720 Cubic Feet) with 3 1,000 watt bulbs burning bright. Needless to say the temps have been in the 90's....BUT the Cool Tubes are finally here! I have 2 - 6 inch tubes on ebay:
(http://www.ebay.com/itm/171174248258?_trksid=p2060353.m2749.l2649&var=470306040572&ssPageName=STRK:MEBIDX:IT)
and the 3rd is in an air cooled hood with glass (which I will hook up along with the cool tubes).
The cool tube and room ventilation systems are separate.
I have a 25' 6 inch aluminum flex duct tube which I plan to run from the outside wall to inside the grow room, and up to the first cool tube light. The next 2 lights (2nd cool tube and then air cooled hood) will be hooked in series with the air exit into the next room. The 25 foot tube from the outside to the first cool tube is pretty straight but when connected in series after the 3rd light, the vent tube has to loop back over the top of the lights and then drop down to the floor to exit the room.
Fans:
1. 600 CFM ($200) very strong 6 inch inline fan,
2. 240 CFM ($100) medium strength inline fan,
3. Several 6 inch "air booster" duct fans from home depot.
Points of Ventilation:
1. 4 inch tube in roof which is slightly obstructed by a vent
2. 25 foot flex duct to an outside wall
3. Adjacent Room
For Cool Tube/Hood Ventilation, my plan is to put the 600 CFM fan on the outside wall and blow the cold air through the 25' Duct into the first cool tube, then the second cool tube and finally the hood. As I said, the exit tube makes a 180 degree turn and then another 90 degree turn before it exits the room so I plan to put a 6 inch Air duct booster fan a couple feet past the bend.
For room ventilation, my plan is to put the 240 CFM fan blowing outside the room (no duct) directly into a carbon filter (a 35 gallon plastic container with a furnace filter sealed on top and topped with activated charcoal). One of the 6 inch duct fans will draw cold air directly from another ventilation tube in the roof-but this is only a 4 inch tube.
Question: Do you agree with my proposed placement of the Fans for optimal cooling/ventilation?
We have considered several configurations.
1. We could ventilate the tubes (rather than the room) with the cold air directly from the 4 inch ceiling tube and blow the hot air directly out of the room using the big fan. However, this would require 4 inch-6 inch reducers/expanders and I don't think this works optimally.
---HOWEVER, it is only a couple of feet vs. 25 feet of fairly straight 6 inch duct. It would also require us to ventilate cool air into the room from that 25 foot tube but we could use the 240 CFM inline fan and 1 (or more) 6 inch duct fans. Which is better?
2. Blow Cool Air or Suck Hot Air? We could also put the big fan just outside the room at the exit, sucking hot air from the cool tubes and drawing cold air from outside down the 25 foot tube and over the cool tubes. We would put a 6 inch duct fan near the outside wall where the cold air is being drawn?? I rejected this provisionally because I am not sure the cheap duct fans can handle freezing cold air (and because it is better for the expensive fan to blow cold air rather than suck hot air).
Thoughts, ideas? What say we all?
