Temperature controlled vent valve??

[OZZ_]

Hey everyone,

So I recently got a spare bedroom set up as a grow room, mainly a personal medical grow. Nothing crazy.

I have a 4x2 tent with a 4' x 6 bulb T5 for moms and veg and a DR90II 3x3 with a lumatek 400/600 for flower. Both tents are ducted with their own 424 cfm vortex fans on fan controllers that join in the middle and vent out the window.

You can see the tents and their common window exhaust vent here:

Its getting really cold here lately and Ild like to keep the room ambient temp from dropping below 70 degrees if possible. Its beneficial for the plants as the room can get down to 60 degrees nighttime temps. I have been using a space heater with a thermostate on it to keep the ambient room temps from dropping too low.

However, its pretty counter productive to be blowing the heat from the lights out the window, then heating the room with a heater. Makes no sense at all.

Obviously the first thought would be to just vent one or both tents directly into the room. The problem is some days are warmer then others and I dont want it getting TOO warm in there and certainly not while flowering lights are on.

Is there anyway to rig up a temperature controlled valve on the exhaust, with some sort of disc mechanism that would direct heat into the room or out the window exhaust based on the ambient temperature??

How would I go about doing that?

Calling all engineers!! lol ..

Do they have something like that alreay? Im sure there is somewhere, I just dont know where to start.

 

[samba]

http://i50.tinypic.com/34rsv0o.jpg
Worked for me.
If you find a proper one, PLZ post it

 

[Vhghost]

i'm no engineer but i have use these electronic duct dampers http://www.netropolus.com/mm5/merchant.mvc?Screen=CTGY&Category_Code=DUCTDAMPERS&Store_Code=C
i went to me nearest hardware store and they worked like a charm..
i used it to vent 2 grow spaces with one inline fan. on a flip/flop
i used a Y and put the damper on one end of the Y and it would open and close when it was needed...
so what i would do in your situation is grab yourself a Y, put one end of the Y into the window and have the other end facing into the room with the Damper attached to this end or the other. wire it to a thermostat set at your prefered temp and this should open only when the temp in your room drops below your said temp, causing the damper to open and vent into the room. instead of out the window.
just woke up and smoked a fatty so if any of this is wonky lol let me know lol
good luck... anything is possible ..
personally i love these dampers

 

[Vhghost]

did this help at all ?

 

[OZZ_]

Thanks for the input... ya those are perfect!

 

[OZZ_]

The only thing is you would need two of them right?

 

[OZZ_]

one to stop flow from going out the window Y when venting into the room and one to stop flow from going into the room when venting out the window?

 

[Bud buster]

You could run a separate fan to vent outside only on a regular thermostat have your tents running constantly making sure to have your veg tent on the whole time your flower lights are off for extra heat and time your flower lights to be off during the warmest part of the day. Now where are the pictures?

 

[Bud buster]

I forgot to mention use a dryer flap to keep the cold or heat from coming back into the room when the fan is off as long as you have a good scrubber connected to your flower fan it will recycle the room air and not smell up the place. You could also run a better dual thermostat for high or low temps.

 

[stagehand099]

Why not dump both tent exhausts into the room and use one of these http://www.amazon.com/gp/product/B000E7NYY8/ref=oh_details_o00_s00_i00 to thermostatically control another exhaust fan going out the window. When the temp in the room hits the setpoint, the window fan turns on and drops the temp to 5-7 degrees below the setpoint. This is kinda what I have going...

stagehand