fans blowing in or out

[larrynews]

when i put my mh lights in my canopy...should the fans blow in or out....i already have 2 blowing in.....thanks

 

[tizzo]

I have one giong in one side the other side going out, but my hood came like that. If I built it myself, I woulda had them both face out. Maybe next time. :thinking:

 

[diadema]

If the plan is to get the heat out of the canopy - have them on top pulling the air up. (heat rises) Of course, if your canopy is completely open in back, the suction that the fans create isn't gonna be much. A closed canopy with small vents works better for the suction method.
Now - if your plan is to cool down the tank temperature, blowing on the surface of the water to raise the evaporation rate is your best bet.

 

[larrynews]

the back of the canopy is open and the 2 fans i have are blowing in, its a 90 gallon and i'm losing about 2 gallons a day in evaperation....and i have a 6 inch clip fan in the sump if i need it to blow across the water, to cool water temp down...i guess at fist i could blow them out and if it gets to hot turn them around....since the back is open should i put them on the top or just vent the top, of the canopy, or do nothing to the top...thanks

 

[diadema]

if the whole back of the canopy is open, I would blow them in toward the water.

 

[larrynews]

thanks....i already have holes drilled in the side from where my fans were before they stopped working in my lights...and since i took it apart and made it a retro....i will look better with the fans there...thanks again

 

[snipe]

I have 2 about 1 and half inch fans blowing in onto my lights it has 5 openings for the air to go out 4 on top and 1 on the other end.