6 to 4 reducer placement

Hey, I just got a new 600w cool hood light. My exhaust fan and carbon filter are 4 inch. I got some 6-4 reducers and just wondering where the best place to put them is, like should I put the reducer right onto the cool hood and hook my 4inch ducting to that or put it at the fan and carbon filters and have my ducting pipe 6 inch? Or will it matter?

Probably won't matter much, I would put it on the end of the cool tube.

jay5coat said:

Probably won't matter much, I would put it on the end of the cool tube.

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That was the answer I was hoping for

kombucha20 said:

Hey, I just got a new 600w cool hood light. My exhaust fan and carbon filter are 4 inch. I got some 6-4 reducers and just wondering where the best place to put them is, like should I put the reducer right onto the cool hood and hook my 4inch ducting to that or put it at the fan and carbon filters and have my ducting pipe 6 inch? Or will it matter?

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no it does matter

the fan u are using if u put the reducer to close to the fan u are making a backdraft against the fan causing it to work harder lessening the life ......same thing if it is to close to the front (sucking)

u want to have a reducer some where near the 6 feet away from the fan ........u can s bend the ducting using it to help reduce the speed of the air before it hits the reducer then it should be a nice steady flow into it with out causing any issue

this is all thinking u are talking about a real inline fan not booster .....a booster u need like 2 feet

justugh said:

no it does matter

the fan u are using if u put the reducer to close to the fan u are making a backdraft against the fan causing it to work harder lessening the life ......same thing if it is to close to the front (sucking)

u want to have a reducer some where near the 6 feet away from the fan ........u can s bend the ducting using it to help reduce the speed of the air before it hits the reducer then it should be a nice steady flow into it with out causing any issue

this is all thinking u are talking about a real inline fan not booster .....a booster u need like 2 feet

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So It would be best to put the reducer right on the light?

kombucha20 said:

So It would be best to put the reducer right on the light?

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i would say no
u got the cool tube hood to keep your area cool ....if u put a 4 inch right one it that is going to limit u to 100 cfms(booster) to 170 cfm (inline)
6inch is 240 (booster) 400 ( inline) cfms

i would use a 6 inch ducting off the hood and a 6 inch inline fan then some ducting off the fan then the reducer 4 inch ducting to the ejection point

this way u can use a speed controller on the fan and lower it if u want too but if u hit some issue where it is to hot u can turn it up higher to fight it instead of running around looking for some quick fix u can do to save your babies from heat stress (if i had to guess low on the speed controller is about 200 cfms )


what is your area size

I only have a 4 inch fan and no speed controller