Venting 8k lights??

rekoj0916

rekoj0916

Well-Known Member
Would the pictured set up work? Or is there a better alternative?

Two bloom rooms 4k each xxxl 8" magnum hoods
Fans would be 8" 745cfm hurricanes

Could both rooms exhaust system be interconnected with insulated ducting even though I'm going to use a flip box. so one room runs day time other runs night. Ventilation would just be always on? 20140629_151038.jpg
 
miccyj

miccyj

Well-Known Member
That's heaps of airflow for just 2 lights at a time, you shouldn't have any problems.
 
rekoj0916

rekoj0916

Well-Known Member
Yeah 750 isnt enough for 4k so might as well just add another. The price is great on Amazon.

Awesome thanks just wanted to make sure I could route them that way :eyesmoke:
 
roormaster

roormaster

Well-Known Member
It depends on what you are looking for. Hurricanes are cheap and noisy but will get the job done. I would do two can max fan HO 932 CFM fans running at the end of the bloom b. If you insulate with r6 you will be good to go. They are more expensive but much better quality. I have also run 3k through 8" hyper fans which is a good mid grade fan and includes a speed controller that can be mounted away from the fan unlike the max fan which has it built into the unit. With whatever situation you do, Bloom B room will have higher lights off temperatures most likely because of heat leaking out of hoods. If you place fans outside of tent it will also help slightly with your temps if it is going to be running 24/7. You could also do two hurricanes and use two boosters in between tents. So many options...
 
jijiandfarmgang

jijiandfarmgang

Well-Known Member
Are you just air cooling the hoods? You could just get two 6" centrifugal fans and put them on the end. run them 24x7.

It seems like the larger fan you go, the less you should cheap out. They don't seem to be balanced properly, among other things.

- Jiji
 
rekoj0916

rekoj0916

Well-Known Member
roormaster said:
It depends on what you are looking for. Hurricanes are cheap and noisy but will get the job done. I would do two can max fan HO 932 CFM fans running at the end of the bloom b. If you insulate with r6 you will be good to go. They are more expensive but much better quality. I have also run 3k through 8" hyper fans which is a good mid grade fan and includes a speed controller that can be mounted away from the fan unlike the max fan which has it built into the unit. With whatever situation you do, Bloom B room will have higher lights off temperatures most likely because of heat leaking out of hoods. If you place fans outside of tent it will also help slightly with your temps if it is going to be running 24/7. You could also do two hurricanes and use two boosters in between tents. So many options...
Click to expand...
I plan on mounting fans outside room, not sure why I depicted it

The reason I planned 4 hurricane is because I'm unsure how long ducting is going to be to push the air out of my garage. So instead of running 4 fans you think 2 of the can max would be enough for the whole set up? And just gave it sucking through Bloom A and B then expel to outside?
 
rekoj0916

rekoj0916

Well-Known Member
jijiandfarmgang said:
Are you just air cooling the hoods? You could just get two 6" centrifugal fans and put them on the end. run them 24x7.

It seems like the larger fan you go, the less you should cheap out. They don't seem to be balanced properly, among other things.

- Jiji
Click to expand...
I'll probably end up going with either can fan or hyper fan both look good online.
I'm cooling the hoods then going to expel that air out if the garage. You really think 1 6" fans would be strong enough to cool 4kw thru20ft ducting then another 10-15ft of ducting out of the roof? Or elaborate if I misunderstood please.
 
roormaster

roormaster

Well-Known Member
Where are you going to be pulling air from, inside the room? I prefer the max HO since it isnt much louder than the hyper but i do own them both since the HO is almost 2x the price. If you do end up going with 4 fans i would run A and B separate from each other and get a splitter to exhaust out the garage. I don't see why you want to reduce the size of the fan when you have 8" hoods and since your running 4k in the room and 2k per fan i would do 8" to get maximum air cooling.
 
jijiandfarmgang

jijiandfarmgang

Well-Known Member
If Rekoj was pulling air from inside the room A, that wouldn't make much sense.

Personally I would get (2) vortex 6" powerfans. If you look at the graphs in the link the delta-t from intake air to exhausted air between 400 cfm and 800 cfm on a 1000 watt bulb is very small. Remember this air is isolated from the grow rooms. The actual temp change inside of the rooms would be even less of a difference.

If you look at the temp rise vs air flow rates chart in the link above and can understand it, you'll understand what I mean. Pay attention to the scale. The cooling rate of the bulb isn't linear to cfm. A 800 cfm fan isn't going to cool twice as much as 400 cfm.

It's not about matching pipe size but about flow restriction. 6 inch fans use less electricity and aren't as loud.

With the electricity operating costs in my neck of the woods would be $232 dollars per year for using the (2) 6" vortex fans 24/7 , and $439 dollars per year for the (2) 8" vortex fans 24/7.

- Jiji
 
roormaster

roormaster

Well-Known Member
200 dollars per year isnt much in the scheme of things. That breaks down to $50 bucks more per harvest if you only harvest 4 times a year which is worth it imo.

Now call me crazy, but i would never use a 6" 452 CFM fan to exhaust two lights out of 4 unless i was asking for heat issues. Also if OP is pulling from inside room to outside of garage they will most likely want to throw a scrubber on the intake which definitely cannot be handled by a 6 inch 452 cfm fan inline with the lights.
Talking costs, a 6" powerfan vortex is 165ish from megagrowers shipped which would be 330 for two. A hyperfan 8" 710 CFM adjustable is 184.00 from megagrowers shipped so 370 for two. Why would anyone buy a smaller fan for 20 less per unit when everything is 8" plus he really does need the cfm. And the kicker... vortex fan 6" is rated at 136 wattage while a hyperfan 8" is rated at 75 Watts so running two HYPERFAN 8" will be almost the same price as running one vortex. Going back to the OP's original comment about hurricanes, they would be comparable in cfm to hyperfan 8" and uses 198 watts per fan. These cost about $110.00 and as stated before will get the job done just noisy.
 
joe blow greenthumb

joe blow greenthumb

Well-Known Member
One problem with connected exhausts is if one tent has an issue with its exhaust then it could cause a back flow into the other tent and serious heat issues. Separate bloom rooms on different timer settings deserve their own exhaust. And let's not forget about light leakage into the dark tent from the lighted tent. From personal experience, you don't want your intake or exhaust coming or going into a secluded corner. The heat can and will eventually backup and fill your intake or exhaust area and eventually reach the tent(s).
 
jijiandfarmgang

jijiandfarmgang

Well-Known Member
$200.00 dollars is a lot if its wasted. Did you look at that chart?

It would make no sense to exchange air 24/7 in room A and not in Room B.

The Hyperfan in an axial (or axial hybrid) fan. The Vortex is a centrifugal. I'm not an expert on HVAC but its my understanding that axial fans don't work very well under medium to high static pressure. Those cfm ratings are at 0 pressure.

You can look at graphs (each from there own manufacturer) at http://www.hydroponics.net/i/140090, and http://vortexpowerfan.com The centrifugal fans clearly work better under pressure.

Vortex is made in Canada, where is Hyperfan made?

Saw a couple reviews online for Hyperfan, they weren't that positive.

Hyperfan claims simlilar flow to Max can 8 and Vortex s-800 (both similar tech fans). But Hyperfan claims to use less than half of the electricity? I find that hard to believe. Although, the Hyperfan doesn't flow near to them with just the slightest static pressure.


- Jiji
 
rekoj0916

rekoj0916

Well-Known Member
roormaster said:
Where are you going to be pulling air from, inside the room? I prefer the max HO since it isnt much louder than the hyper but i do own them both since the HO is almost 2x the price. If you do end up going with 4 fans i would run A and B separate from each other and get a splitter to exhaust out the garage. I don't see why you want to reduce the size of the fan when you have 8" hoods and since your running 4k in the room and 2k per fan i would do 8" to get maximum air cooling.
Click to expand...
I was merely curious about Jijis points. However I'm thinking 8"is what I'll stick too.
 
rekoj0916

rekoj0916

Well-Known Member
joe blow greenthumb said:
One problem with connected exhausts is if one tent has an issue with its exhaust then it could cause a back flow into the other tent and serious heat issues. Separate bloom rooms on different timer settings deserve their own exhaust. And let's not forget about light leakage into the dark tent from the lighted tent. From personal experience, you don't want your intake or exhaust coming or going into a secluded corner. The heat can and will eventually backup and fill your intake or exhaust area and eventually reach the tent(s).
Click to expand...
Light leak is something else I am concerned about. Good point, I'll go ahead and make the exhausts separate from each other. I'll
 
rekoj0916

rekoj0916

Well-Known Member
roormaster said:
200 dollars per year isnt much in the scheme of things. That breaks down to $50 bucks more per harvest if you only harvest 4 times a year which is worth it imo.

Now call me crazy, but i would never use a 6" 452 CFM fan to exhaust two lights out of 4 unless i was asking for heat issues. Also if OP is pulling from inside room to outside of garage they will most likely want to throw a scrubber on the intake which definitely cannot be handled by a 6 inch 452 cfm fan inline with the lights.
Talking costs, a 6" powerfan vortex is 165ish from megagrowers shipped which would be 330 for two. A hyperfan 8" 710 CFM adjustable is 184.00 from megagrowers shipped so 370 for two. Why would anyone buy a smaller fan for 20 less per unit when everything is 8" plus he really does need the cfm. And the kicker... vortex fan 6" is rated at 136 wattage while a hyperfan 8" is rated at 75 Watts so running two HYPERFAN 8" will be almost the same price as running one vortex. Going back to the OP's original comment about hurricanes, they would be comparable in cfm to hyperfan 8" and uses 198 watts per fan. These cost about $110.00 and as stated before will get the job done just noisy.
Click to expand...
I'm pulling air from garage thru lights and then outside garage roof. I'm thinking exhausting both separate and then connecting to a splitter that finally exhausts both out is going to look best thus far.
 
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