need help with ventilation

gogsyc

gogsyc

Active Member
Setting up a new flower room and need help with ventilation to keep temps in check

What size cfm of extract fan and intake fan

Room Size 10'w x 15'l x 8'h
Wattage 5 x 600w hps

Was looking at 2 12" extractor fan both are 524cfm for extraction

Is this enough to cool 5 x 600watts hps. Lights will be run in the night time, open type reflectors.
No air-con
 
firsttimeARE

firsttimeARE

Well-Known Member
Is air cooled reflectors a plan? Whats the intake air temperature going to be like? This will determine how quickly you need to remove air.

If not yeah you're going to need some BEAST of fans to exhaust. I'd aim for around 2 air changes a minute. So at a 1200 cubic foot room. Those fans bring you under 1 air change a minute.

And i'd use a passive intake. Intake fans are a waste IMO. The displacement of air in the room created by your exhaust fans will create enough of a negative pressure to pull air through even the tiniest of cracks in the room, definitely enough to pull through a screened inlet.
 
machnak

machnak

Well-Known Member
I'd set one of the fans up to the hood, hopefully it's air-cooled, and the other one to a filter, both exhausting. Have them both exhaust and use passive intake.
 
HydroDawg421

HydroDawg421

Well-Known Member
Hopefully these lights are air cooled. If that's the case most if the heat will be drawn off the bulb before it even enters the room. Then I would add a couple of fans in the room & CO2. See what your temps are and add an exhaust fan if necessary.
 
gogsyc

gogsyc

Active Member
unfortunatly the lights i have are not air-cooled, if it makes a big big difference to temps i'm willing to get some, are they worth the extra cost ?
 
firsttimeARE

firsttimeARE

Well-Known Member
gogsyc said:
unfortunatly the lights i have are not air-cooled, if it makes a big big difference to temps i'm willing to get some, are they worth the extra cost ?
Click to expand...
https://www.rollitup.org/hydroponics-aeroponics/94811-al-b-faqt-83.html look at post #846 to make your own batwing type parabola reflector for cheaper and they're definitely worth the cost even retail. You can use glass pyrex baking cylinders. Put a mogul socket on the back with some clamps and ducting and bam you got yourself a ducted cool tube for a fraction of the cost.

You can get your light closer also, which means more lumens.
 
gogsyc

gogsyc

Active Member
im just gonna buy the air cooled reflectors what size fan do i need for 4 600w and what size for 6 600w ?
 
gogsyc

gogsyc

Active Member
cool, im thinking two rows with 3 x 600w per row linked in straight line with ducting one fan at first light what size do u reckon 300ish cfm ? per row
 
S

SwissCheese

Well-Known Member
You haven't mentioned what type of climate you're in bro. Any recommendation without knowing this is no good. I run 6 1000w lights about to be 7 in one room non air cooled with a passive cold air intake and my temps never get above 80* using a sentinel chhc 4 to control my 12" 1000cfm fan. Wouldn't spend more money on air cooled lights yet give some more information.
 
gogsyc

gogsyc

Active Member
SwissCheese said:
You haven't mentioned what type of climate you're in bro. Any recommendation without knowing this is no good. I run 6 1000w lights about to be 7 in one room non air cooled with a passive cold air intake and my temps never get above 80* using a sentinel chhc 4 to control my 12" 1000cfm fan. Wouldn't spend more money on air cooled lights yet give some more information.
Click to expand...
climate in this country is shite winter and summer not much off a difference
winter temps 30 - 60
summer 50 - 70

humidity summer high 70
winter 40
 
gogsyc

gogsyc

Active Member
great lights cant get them here though and to get them online the delivery is insane almost the same as the light, sometimes more !
 
S

SwissCheese

Well-Known Member
If you're in winter now like I am you should be able to run your lights without air cooling no problem. $200 to $400 for a 1000cfm fan, duct, vent, and fan speed controller if you can't swing a controller like the sentinel. And you'll have room to add more lights down the road and more money in your pocket compared to buying air cooled lights. You can get everything off ebay or www.htgsupply.com . I'm using growbright magnetic ballasts, big kahuna reflectors, sunmaster bulbs, growbright 12" inline fan 1050cfm <$200(will be getting the new mach fan asap looks more like a max fan).

Your room is almost identical to mine in basic dimensions and you will have no problem cooling down everything with the cheap 12" fan above. What do you plan to do for your cold air intake?
 
gogsyc

gogsyc

Active Member
SwissCheese said:
If you're in winter now like I am you should be able to run your lights without air cooling no problem. $200 to $400 for a 1000cfm fan, duct, vent, and fan speed controller if you can't swing a controller like the sentinel. And you'll have room to add more lights down the road and more money in your pocket compared to buying air cooled lights. You can get everything off ebay or www.htgsupply.com . I'm using growbright magnetic ballasts, big kahuna reflectors, sunmaster bulbs, growbright 12" inline fan 1050cfm <$200(will be getting the new mach fan asap looks more like a max fan).

Your room is almost identical to mine in basic dimensions and you will have no problem cooling down everything with the cheap 12" fan above. What do you plan to do for your cold air intake?
Click to expand...
i can get cool tube reflectors for cheap enough, fans are expensive i reckon talking about equivalent of $600 for 1000cfm.

For intake was thinking of small fan pulling cold air from uninsulated attic directly above flower room
 
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