Heat Issues :(

[weimaraner]

I didn't think I would have this problem. I thought I had researched/read enough forums, how-to's and cfm calcs (etcetcetc), but it is happening anyway.

I decided to go 400w HID (no cool tube) in a 4x4x7 tent, which is in an empty room.
I have a 400 cfm inline fan, outside of the tent, drawing air out from the top back of the tent. It seems to be physically doing well as there is clearly negative pressure, and I can feel good inflow through other vents.
However, after 30 minutes, the temperate has gone from 73 to 91 at the bottom of the tent (remainder of tent feels cool). The light is 3ft from the floor.

Which option(s) are needed?
1. A fan pointed directly at the bulb?
2. A floor level intake?
4. Something else...

Thanks,
w

 

[kevb123]

really you could do with fresh cool air being pumped in the bottom by another inline.
or get an oscillating fan on the plant itself

 

[tjsap24]

I didn't think I would have this problem. I thought I had researched/read enough forums, how-to's and cfm calcs (etcetcetc), but it is happening anyway.

I decided to go 400w HID (no cool tube) in a 4x4x7 tent, which is in an empty room.
I have a 400 cfm inline fan, outside of the tent, drawing air out from the top back of the tent. It seems to be physically doing well as there is clearly negative pressure, and I can feel good inflow through other vents.
However, after 30 minutes, the temperate has gone from 73 to 91 at the bottom of the tent (remainder of tent feels cool). The light is 3ft from the floor.

Which option(s) are needed?
1. A fan pointed directly at the bulb?
2. A floor level intake?
4. Something else...

Thanks,
w

Can you air condition the room your tents in? To bad you didn't have a air cooled hood you could remove alot of the heat right from the source. What type of light do you have?

 

[weimaraner]

Can you air condition the room your tents in? To bad you didn't have a air cooled hood you could remove alot of the heat right from the source. What type of light do you have?

If the winter wasn't this warm I'd probably be fine No individual AC to the room though.

It is a 400w Apollo ballast and lights. Would running duct to the side edge of the hood help?

 

[Kervork]

You need a fan blowing towards the bulb or you will get a big heat bubble around the bulb. Make sure the inlet is as far from the outlet as possible, ideally, suck from the bottom and blow from the top.

 

[tjsap24]

If the winter wasn't this warm I'd probably be fine No individual AC to the room though.

It is a 400w Apollo ballast and lights. Would running duct to the side edge of the hood help?

Yeah i'm in Florida so I know about the warm winters. So i'm still not sure if you have a batwing type light or an enclosed one. I had a enclosed one so I cut a hole in the side and mounted a 4 inch flange to a small squirrel fan that pushed through a carbon filter. It had a place for optional glass, so I put in a piece smaller then needed so there was a three inch gap for the intake. Kinda hard to explain, but it worked great for me. My setup was in a small growbox, located in a wooden shed that was under shade trees. Worked great until july and august then it got in the upper nineties. I really didn't find the inline fans to work that great. I still have a brand new that I didn't use.