best place for extractor ?

[iNFID3L]

guys ive actually got my extractor in the grow room itself, but im venting out through a 10 mtr pipe up out through the roof top, im looking at a bigger extractor as im struggling with temps, so should i fit my old one inline somewhere along the 10 mtrs ?

new one is 8 inch, currently using a 6, pls advise

to finish off, 8 inch 1 mtr from the lamp , connected via flexipipe, then 6 inch say 4 meters up the pipe ?

 

[brewbeer]

Piping should be full diameter all the way to the discharge point to get max flow. Don’t reduce the pipe diameter.

 

[iNFID3L]

i am unable to make it any bigger due to being an old heating extractor flu pipe, its built into the chimney, access is impossible. main pipe is 140mm, all i can do, is force more air through it.

 

[jondamon]

guys ive actually got my extractor in the grow room itself, but im venting out through a 10 mtr pipe up out through the roof top, im looking at a bigger extractor as im struggling with temps, so should i fit my old one inline somewhere along the 10 mtrs ?

new one is 8 inch, currently using a 6, pls advise

to finish off, 8 inch 1 mtr from the lamp , connected via flexipipe, then 6 inch say 4 meters up the pipe ?

1. What size room are you using?

2. How many lights of what type and wattage?

3. What is the current 6” CFM or M3/h?

4. What are your current environmental variables?

5. What temp is your intake air?

 

[coreywebster]

What fans are they? On such a long duct Pa rating is very important.

My old fan could push up a chimney through a 5 meters of duct and at the same time create enough negative pressure to drag air passively through another chimney from the basement 30ft below.

 

[Renfro]

Use a centrifugal blower and oversize. Mixed flow or axial fans don't handle static pressure loss well.