Help with exhaust! 4'x4'x8' tent.(posted in wrong thread)

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OldDogNewTricks

Member
Tired of having to leave my door open.

Have a 600W air cooled hps (has own fan) and 315w cmh in a bat wing atm in there.

Tent will take in passive air @70F 43 RH constantly.

About 10 feet of ducting.
No filter.

Can you please recommend size/brand for an economic wallet?
I tired one of the metal 6" booster fans but it doesnt do a darn thing.

According to my numbers I should only need about 80cfm to exchange air once every 2 min.

Will one of these work?
It seems to have an impeller blade I stead of the regular fan blade like the booster has...
20191029_171506.jpg
 
GrnLeavz

GrnLeavz

Member
There are generally 2 methods to calculate wich exhaust you need.

1. Take 1 cubic meter per 1 watt
2. You should be able to refresh your air 3 times per minute. So for a 1mx1mx2m tent it would be: 2m3 x 3(/minute) x 60 (/hour)

I hope this helps and sorry for using metric :)
 
O

OldDogNewTricks

Member
GrnLeavz said:
There are generally 2 methods to calculate wich exhaust you need.

1. Take 1 cubic meter per 1 watt
2. You should be able to refresh your air 3 times per minute. So for a 1mx1mx2m tent it would be: 2m3 x 3(/minute) x 60 (/hour)

I hope this helps and sorry for using metric :)
Click to expand...
3x per min?
I thought it was 1x per 3 min??
 
O

OldDogNewTricks

Member
Decided to go with this.
Hoping with it pulling through light to cool light and room will be enough with a couple junky 220 cfm booster fans for intake in tent.
20191029_214326.jpg
 
O

OldDogNewTricks

Member
madvillian420 said:
tent door or room door? how big and what temp is the room/space your tent is at?
Click to expand...
Tent door.
madvillian420 said:
tent door or room door? how big and what temp is the room/space your tent is at?
Click to expand...
Was my tent door.

Got new hood today for the hps and have a 220cfm cooling it from outside tent.

Have 2 - 220cfms pulling out exhaust on top and bottom with an industrial floor fan on a speed controller blowing into another piece of 6" duct that I have bent up to disperse the intake.

Seems to be working.
With GPS and cmh running tent us holding @ 77F and 56 RH.

The ladies are happy and I'm super pleased. Didn't have to buy a new fan after all :)

Got the tent last night and the hood today so new to all this venting and such.

Really appreciate everyone's advice.
 
PJ Diaz

PJ Diaz

Well-Known Member
OldDogNewTricks said:
Tent door.

Was my tent door.

Got new hood today for the hps and have a 220cfm cooling it from outside tent.

Have 2 - 220cfms pulling out exhaust on top and bottom with an industrial floor fan on a speed controller blowing into another piece of 6" duct that I have bent up to disperse the intake.

Seems to be working.
With GPS and cmh running tent us holding @ 77F and 56 RH.

The ladies are happy and I'm super pleased. Didn't have to buy a new fan after all :)

Got the tent last night and the hood today so new to all this venting and such.

Really appreciate everyone's advice.
Click to expand...
You didn't get the 440?
 
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