Need ideas to solve heat problem With diagrams! (+rep)

jugg1es

Member
I'm running into a problem that I'm sure many people have. My DIY growbox is in the closet of what's basically my computer room. The closet is about 2ft deep with sliding doors and spans the entire wall. It's made of wood and has an air-cooled 400w HPS. The air intake and exhaust are both behind the box. Attached is a diagram. Apart from the air-cooling ventilation, I have a series of 3 computer fans exhausting hot air from the box itself into the room. When the box is on, it can heat my room up pretty quickly.

The lights are timed to turn ON around 9:30pm and OFF around 9:30 AM. So they're on during the night, not the day.

My plants are around 5 weeks flowering and they have gotten so tall and dense that the the system I currently have just can't keep the temperatures below 85-90 with the door closed without opening my window to the freezing air outside (making it uncomfortable to be on the computer). And I have to close the window in the morning so the plants don't freeze and I certainly can't leave the door open all day to the sunlight.

What I really need is a STEALTH way to either exhaust the air directly outside or get the cold air inside through the window and directly into the box. I was thinking of using one of those in-window fans that have exhaust and intake and just taking it apart and attaching ventilation tubing. My worry is that it will be hard to hide IN my room.

Using the diagram (which is roughly to scale), anyone have any ideas? what did you do to solve this problem?
 

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CokeyoDrips

Well-Known Member
If the air intake and exhaust are in the same area behind the box, you are just pulling warm air from the exhaust back into the box. I had heat issues in my closet. So, I set it up to pull air from my attic and vent into my room (but not into the closet). You may have to cut some holes in the wall...Make it look nice, do a good job and use some nice grating and it will look like a heater vent from the furnace.
 
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