6" inline for 2x4?

pegboy

pegboy

Well-Known Member
Nizza said:
-passive intake, be sure intake is around 3x the area of the exhaust fan. That would be two 6" passive intakes for a 4" exhaust (200 cfm ac infinity)
-Note: if adding a filter/ screen the exhaust will no longer push the 200 CFM it is advertised to. This goes for the intake holes as well-- if adding a screen to filter the intake it is good to increase the hole depending how fine the screen is to make up for the loss. I think you could probably get away with a second 4" fan used as an intake, which is how I like to set up (active intake + active exhaust), I use an intake filter as well.
-Use hard ducting to make it work most efficient. This will also make it louder though. Long sweep bends are better than short sweeps
-set up the exhaust fan up high, and the intake down low (humidity rises as well as heat)
- reduce evaporation from drain tray, pots, and reservoir if possible by capping
-thinning the foliage can help
-Make sure your hygrometer isn't effected by your lights and is giving an accurate reading
Click to expand...
Some nice suggestions!! Thanks !!
 
pegboy

pegboy

Well-Known Member
OK. Day off work so I'm monitoring what's going on.

LIGHTS ON:

HOUSE: temp 70F RH 40%
GROW ( prox 7'x 7') RM: 73F RH 46%
TENT: 75F RH 57% with fan blasting 9/10

SO do I go with a small room dehumidifier or step up from a 4" to a 6" inline fan system??

EDIT: pay no attention to the reading in the picture. That was from just after lights on.

EDIT 2: This is set up passive. Fan sucking air out of tent with low flaps wide open. Plants are around 24"tall. 3 fans for air movement.

IMG_20240424_070956982.jpgIMG_20240424_071035587.jpg
 
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Billy the Mountain

Billy the Mountain

Well-Known Member
I have a similar setup; a 4x2 tent or two in a small room/large closet (10'x6'). This 'lung room' is within a large basement.

If I exhaust into the lung room, similar to the pic above, the humidity never leaves the room and a dehumidifier is required to keep humidity in check.
I configure it that way when using CO2; otherwise I exhaust through a hole in the wall to the larger basement; no dehuhey is needed.

Also, pushing air through the filter is much more restrictive than pulling air though the filter and will require more fan speed for the same airflow.
 
pegboy

pegboy

Well-Known Member
Billy the Mountain said:
I have a similar setup; a 4x2 tent or two in a small room/large closet (10'x6'). This 'lung room' is within a large basement.

If I exhaust into the lung room, similar to the pic above, the humidity never leaves the room and a dehumidifier is required to keep humidity in check.
I configure it that way when using CO2; otherwise I exhaust through a hole in the wall to the larger basement; no dehuhey is needed.

Also, pushing air through the filter is much more restrictive than pulling air though the filter and will require more fan speed for the same airflow.
Click to expand...
Awesome. Do you think a 6" would at least equalize the room?
 
marzig

marzig

Member
I have a 2x4x6 that I use a 6" fan and carbon filter in. Tent is in a 2x8 closet with by-pass doors which remained closed. Fan is vented through the attic to a roof vent. Air intake is through the two 6" vent holes at each end of the bottom of the tent. Apparently more than enough air finds it way in past the closed by-pass closet doors. I'm running 3-Mars TS1000s at 90% most of the time 18/6. In my home I'm either running the furnace or central air set at 73. Household RH averages 30 to 37%.

I've never had the tent RH above 40%, and it usually stays just a little above the house RH. even with 2-5gal dwc buckets. I can easily maintain temps between 75 to 82. Before this I was running a 4" fan and was never satisfied with heat or humidity levels.
 
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