10 Cubic Foot Box Ventillation Issues!

graphuto · #1 (**permalink**) 11-05-2009, 12:38 AM

So, I built roughly a 10-11 cubic foot veg box. I have a 65CFM exhaust as well as a 65 CFM intake, and temps are pushing 90 degrees! Ambient room temp is 77-80. How is this possible? Im only using 4 (32 watt) CFL's!

graphuto · #2 (**permalink**) 11-05-2009, 03:19 AM

Anyone have any advice?

Don Piano · #3 (**permalink**) 11-05-2009, 05:52 AM

don't be fooled, cfls give off crazy heat. You will need to step up the fannage. You say 65cfm fans, but you fail to say what kind. Different fans for different jobs. If you had a cheap dayton blower on there it would work better than pc fans of the same rating due to static pressure. Different fans like the vortex for instance will move serious air through bends in ducting but not as well as a blower like a big dayton (of the same cfm rating) will, and a small duct fan from homedepot will not move air through a box hardly at all.
My guess is you have the latter and you have now found out that they do not work like you want them to. Step up to a single 4" dayton blower with no fan on the intake and you will be just fine for under $100

graphuto · #4 (**permalink**) 11-05-2009, 05:53 AM

I have 2 of these!

120VAC 4" Fan - RadioShack.com

Theyre movin some air!

Don Piano · #5 (**permalink**) 11-05-2009, 05:27 PM

Not trying to be rude, but if they were moving air, you would not have heat issues. Those would be 120v PC fans, and those can not handle any static pressure. Those are designed to pull hot air off of a heatsink. You will need to upgrade if you want the heat issue resolved.
Discount Hydroponics - Dayton Blowers

graphuto · #6 (**permalink**) 11-05-2009, 05:51 PM

Woot, thanks a million, Don! I need about another month till I will have enough extra money for those..

Don Piano · #7 (**permalink**) 11-05-2009, 06:24 PM

you only need one for your exhaust, use a passive intake.

graphuto · #8 (**permalink**) 11-05-2009, 06:31 PM

So you are fairly certain this will help me drop temp at least 5 degrees?

PotPower · #9 (**permalink**) 11-06-2009, 05:08 AM

ok open up 2 4" holes at the bottom of your plant level

Take both fans and use them as exhaust fans

yes passive intake and suck the hot air out of that THING from the top!!

thank me later

Don Piano · #10 (**permalink**) 11-06-2009, 07:14 AM

yes it will drop it beyond 5 degrees. I do suggest a thermostat to go with it so it does not have to run constantly.

graphuto · #11 (**permalink**) 11-06-2009, 02:03 PM

Don, while your advice is probably the best way to go, I'm gonna go the route of just using 2 exhausts, like the other guy said. I don't have the money for one of those blowers at the moment, but as soon as I do, you can bet that those tiny fans are coming down, and the big guy is goin up! Thanks to everyone for their advice, I don't think we need this thread anymore!

Thanks again,
Graph

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
grow box design guide	gr0wer	Grow Room Design/Setup	92	11-18-2009 08:43 PM
Building an Easy Beginner's Grow Box: Step by Step! [Pics]	Bajablast	General Indoor Growing	0	09-06-2009 09:45 PM
Cheap Grow box design	MrERoach	Grow Room Design/Setup	13	12-13-2008 10:05 PM

Site links

FAQ

Important

Extra

#1 (permalink) 11-05-2009, 12:38 AM
graphuto Grower Join Date: Sep 2009 Posts: 222	10 Cubic Foot Box Ventillation Issues! So, I built roughly a 10-11 cubic foot veg box. I have a 65CFM exhaust as well as a 65 CFM intake, and temps are pushing 90 degrees! Ambient room temp is 77-80. How is this possible? Im only using 4 (32 watt) CFL's!

#2 (permalink) 11-05-2009, 03:19 AM
graphuto Grower Join Date: Sep 2009 Posts: 222	Re: 10 Cubic Foot Box Ventillation Issues! Anyone have any advice?

#3 (permalink) 11-05-2009, 05:52 AM
Don Piano Extraordinary Pianist Join Date: Feb 2008 Location: Uranus Posts: 1,738	Re: 10 Cubic Foot Box Ventillation Issues! don't be fooled, cfls give off crazy heat. You will need to step up the fannage. You say 65cfm fans, but you fail to say what kind. Different fans for different jobs. If you had a cheap dayton blower on there it would work better than pc fans of the same rating due to static pressure. Different fans like the vortex for instance will move serious air through bends in ducting but not as well as a blower like a big dayton (of the same cfm rating) will, and a small duct fan from homedepot will not move air through a box hardly at all. My guess is you have the latter and you have now found out that they do not work like you want them to. Step up to a single 4" dayton blower with no fan on the intake and you will be just fine for under $100 __________________ LEARN about cge (totally sealed grow box) AND much more here Don't contact me for any type of trading/buying situation. You are wasting your time and mine. I do not grow, or even smoke marijuana. This is all pretend. Like pre-school. You can't tell your Aspen from a pole in the ground if you believe any of this stuff.

#4 (permalink) 11-05-2009, 05:53 AM
graphuto Grower Join Date: Sep 2009 Posts: 222	Re: 10 Cubic Foot Box Ventillation Issues! I have 2 of these! 120VAC 4" Fan - RadioShack.com Theyre movin some air!

#5 (permalink) 11-05-2009, 05:27 PM
Don Piano Extraordinary Pianist Join Date: Feb 2008 Location: Uranus Posts: 1,738	Re: 10 Cubic Foot Box Ventillation Issues! Not trying to be rude, but if they were moving air, you would not have heat issues. Those would be 120v PC fans, and those can not handle any static pressure. Those are designed to pull hot air off of a heatsink. You will need to upgrade if you want the heat issue resolved. Discount Hydroponics - Dayton Blowers __________________ LEARN about cge (totally sealed grow box) AND much more here Don't contact me for any type of trading/buying situation. You are wasting your time and mine. I do not grow, or even smoke marijuana. This is all pretend. Like pre-school. You can't tell your Aspen from a pole in the ground if you believe any of this stuff.

#6 (permalink) 11-05-2009, 05:51 PM
graphuto Grower Join Date: Sep 2009 Posts: 222	Re: 10 Cubic Foot Box Ventillation Issues! Woot, thanks a million, Don! I need about another month till I will have enough extra money for those..

#7 (permalink) 11-05-2009, 06:24 PM
Don Piano Extraordinary Pianist Join Date: Feb 2008 Location: Uranus Posts: 1,738	Re: 10 Cubic Foot Box Ventillation Issues! you only need one for your exhaust, use a passive intake. __________________ LEARN about cge (totally sealed grow box) AND much more here Don't contact me for any type of trading/buying situation. You are wasting your time and mine. I do not grow, or even smoke marijuana. This is all pretend. Like pre-school. You can't tell your Aspen from a pole in the ground if you believe any of this stuff.

#8 (permalink) 11-05-2009, 06:31 PM
graphuto Grower Join Date: Sep 2009 Posts: 222	Re: 10 Cubic Foot Box Ventillation Issues! So you are fairly certain this will help me drop temp at least 5 degrees?

#9 (permalink) 11-06-2009, 05:08 AM
PotPower Registered User Join Date: Aug 2009 Posts: 20	Re: 10 Cubic Foot Box Ventillation Issues! ok open up 2 4" holes at the bottom of your plant level Take both fans and use them as exhaust fans yes passive intake and suck the hot air out of that THING from the top!! thank me later

#10 (permalink) 11-06-2009, 07:14 AM
Don Piano Extraordinary Pianist Join Date: Feb 2008 Location: Uranus Posts: 1,738	Re: 10 Cubic Foot Box Ventillation Issues! yes it will drop it beyond 5 degrees. I do suggest a thermostat to go with it so it does not have to run constantly. __________________ LEARN about cge (totally sealed grow box) AND much more here Don't contact me for any type of trading/buying situation. You are wasting your time and mine. I do not grow, or even smoke marijuana. This is all pretend. Like pre-school. You can't tell your Aspen from a pole in the ground if you believe any of this stuff.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

#11 (permalink) 11-06-2009, 02:03 PM
graphuto Grower Join Date: Sep 2009 Posts: 222	Re: 10 Cubic Foot Box Ventillation Issues! Don, while your advice is probably the best way to go, I'm gonna go the route of just using 2 exhausts, like the other guy said. I don't have the money for one of those blowers at the moment, but as soon as I do, you can bet that those tiny fans are coming down, and the big guy is goin up! Thanks to everyone for their advice, I don't think we need this thread anymore! Thanks again, Graph