HELP -150 hps to hot-100 hps or 100 MH help
- Thread starter goready
- Start date
what kind of ventilation you got? Maybe we can get that 150 back in the cab for you...
Get a small 120V fan if you can find it, a lot more power and air movement. Holmes makes a little tiny one for desks and whatnot. It could be easily modified to fit your cabinet.
Hmmm ... I'm cooling a 250 in a 22x29x54 space with a 76 CFM axial fan. I'm going to guess too little intake or too much filter. Is your intake area double (minimum) the exhaust? If not, you're choking the cab. Note that four 1 inch holes do NOT a 4 inch hole make (OK so the pic is nine but, the idea's the same)
Can you cut filter material by half? I'm doing well with a DIY Odorsock with 1/8th inch thick Carbon pads.
Can you cut filter material by half? I'm doing well with a DIY Odorsock with 1/8th inch thick Carbon pads.
If the exhaust is 6", you want two 6" intakes to the cab.
a 6 inch hole has a surface area of 28.27 sq.in X 2= 56.54 8 inch has 50.25 sq.in only 6.54 sq.in difference dosent seem like that much difference i cracked the box door and it did not drop the temp the same amount of air comes out of the fan exhaust with the box door open or closed the lamp is 3 inches under the fan exhaust there has to be something that will drop the temp
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Right now I have 6 2'' PVC intakes that consist of two 90s taped together. This gives me 18.85 sq inches of intake. The exhaust of the fan is a 4'' cricle so it's area is 12.5 sq inches.
Here is the kicker...
The fan goready and I use is a variable DC motor. It speeds up to maintain it's rated 80CFM. When I open my cab door I can hear the motor slow down a little bit about 4 seconds after opening the door. It is not a huge difference, but one of my design goals was to make the quietest cab possible and I'll add more intakes down the road.
goready - you could pick up a 8x8 inch dark room louver to cover your intake.
FreezerBoy - I know you saw better results with having double the intake, but hoosierdaddy says about +10% more in than out is all that is needed. Because I have this variable speed fan I'll hopefully be able to find out where the real answer is, which must be between.
Here is the kicker...
The fan goready and I use is a variable DC motor. It speeds up to maintain it's rated 80CFM. When I open my cab door I can hear the motor slow down a little bit about 4 seconds after opening the door. It is not a huge difference, but one of my design goals was to make the quietest cab possible and I'll add more intakes down the road.
goready - you could pick up a 8x8 inch dark room louver to cover your intake.
FreezerBoy - I know you saw better results with having double the intake, but hoosierdaddy says about +10% more in than out is all that is needed. Because I have this variable speed fan I'll hopefully be able to find out where the real answer is, which must be between.
I think I have to go with FreezerBoy on this one, no slight to hoosierdaddy or anyone else. I just picked up a digital indoor/outdoor thermometer with a remote for the cab. I've always known my intake was a little smaller than optimum, the exhaust speeds up slightly when the door is closed. Since I got the thermometer, I can measure the difference. I think I'll increase my intake and watch my temps go down about 2 degrees f. Two degrees doesn't seem like much but I'll take it.
catman said:
Depends on what you're running. When I had a 150, a single matching intake was enough. If one is enough, one is enough. But, if you're overheating, doubling intake is the easiest, cheapest way out. Some go as far as 4X.
Hoosier knows his stuff. You won't go wrong there. My way is cheap and lazy compared to his but, it'll work.
