lights not cooling well
- Thread starter jpiduke
- Start date
joe macclennan
Well-Known Member
you need to give more details on your ducting and stuff. What size duct are you running? flexible or ridgid? How many elbows or bends are in the runs?
firstly you shouldn't need both and intake and exhast fan if they are pushing 400cfm each.
One is sufficient.
you need to give much more info.
pics would be nice
firstly you shouldn't need both and intake and exhast fan if they are pushing 400cfm each.
One is sufficient.
you need to give much more info.
pics would be nice
AlecTheGardener
Well-Known Member
He has it right.
Take a look at this wonderful resource all about ventilation.
https://www.rollitup.org/t/ventilation-101-lets-make-this-a-sticky.778527/
joe macclennan
Well-Known Member
yeah, It sounds like he is only cooling the fixtures...and has both intake and exhaust fans on the duct.
joe macclennan
Well-Known Member
idk. I kinda prefer putting the fan on the intake side. It runs much cooler that way. You do risk blowing air out of the hoods though and pressurizing the room if not sized appropriately.
to each their own.
that's it see pic, but also a 400 cfm outgoing fan with passive incomming
Last edited:
joe macclennan
Well-Known Member
ok well first i'd say try to straighten all the ducts out as much as possible. and the thirty feet to outside window is a loOOng way.
I would upsize all of the duct to @ least 8" ......10" would be better.
an 6" duct will only move around 100cfm or so..and this is under perfect conditions. a lot of bends or long runs and it will be less.
an 8" duct will only move around 225cfm
a ten inch will move about 400cfm
I would upsize all of the duct to @ least 8" ......10" would be better.
an 6" duct will only move around 100cfm or so..and this is under perfect conditions. a lot of bends or long runs and it will be less.
an 8" duct will only move around 225cfm
a ten inch will move about 400cfm
joe macclennan
Well-Known Member
just flex brother. You said the fan you have is rated @ 400cfm correct? In order to move this much you'll need ten inch flex....Especially given the amount of bends and the distance you are going.
I know it sounds pretty big...and it is but a duct can only move so much air by size.
I know it sounds pretty big...and it is but a duct can only move so much air by size.
jrainman
Active Member
Agree with Joe , you need to move up to 10 inch flex,
but use each 400 cfm fan on exhaust side one fan per light pulling
if you do it this way you will have a lot more exhaust then needed ,
So at this point I would utilize the Tee fittings you have on the intake side of the lights , of course you will need to by some reducer fitting 10'' to 6'' off the lights and fans , .but install those 6'' tees to lights put a manual damper on the bull of each Tee then you can have the ability to exhaust air out of the room also and at the amount you want by adjusting the damper, also you can take it a step further with the addition of filters off those Tees also.
Also have to give you a lot of credit you put a drawing up of what you installed , it gave a lot of information and made it a much easier task to see why you are having issues.
but use each 400 cfm fan on exhaust side one fan per light pulling
if you do it this way you will have a lot more exhaust then needed ,
So at this point I would utilize the Tee fittings you have on the intake side of the lights , of course you will need to by some reducer fitting 10'' to 6'' off the lights and fans , .but install those 6'' tees to lights put a manual damper on the bull of each Tee then you can have the ability to exhaust air out of the room also and at the amount you want by adjusting the damper, also you can take it a step further with the addition of filters off those Tees also.
Also have to give you a lot of credit you put a drawing up of what you installed , it gave a lot of information and made it a much easier task to see why you are having issues.
joe macclennan
Well-Known Member
thank you JR as usual you give the best info on this subject...
btw, glad you made it onto the new forum
btw, glad you made it onto the new forum
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