well 1 thing is you got a 6" fan blowing in but no exhaust though
Exhaust helps more then intake
you need more air going out then what you have going in
once you start exhausting more air out then what is going in your temps will start to drop
Here are a few examples
COMPARISON OF CABINET DESIGNS
1. Simple Cab - one chamber, no scrubbers or restrictions to airflow.
CFM = 3.16*Watts/deltaT
where deltaT = 10 *F
Intake Area = 2 x Exhaust Area
Fans - Axial/Computer Fans due to minimal pressure loss
Example: A 400 W HPS in a 3 x 3 x 4 cabinet needs 126 CFM of cooling for a 10*F temp rise above room temperature.
The 36 cu ft cabinet is ventilated at over 3 Air Changes Per Minute.
Pro:
Easy to build
Fans - axial
Con:
plants stink up the place
plants are stressed by too much airflow at 3 ACpM.
The plants only need 5 Minutes per Air Changes (MpAC). That's 0.2 Air Changes per Minute (ACpM).
For you hydro guys, this means more rez changes and nute swings because the plants will be drinking alot to keep
up with the dehydration caused by living in a wind tunnel.
2. Simple Cab with Scrubber
CFM = 3.16*(Total Watts)/deltaT
where deltaT = 10 *F
Intake Area = 2 x Exhaust Area
Fans - Blower or Inline for high pressure drop across scrubber
Example: A 400 W HPS in a 3 x 3 x 4 cabinet needs 126 CFM of cooling for a 10*F temp rise above room temperature.
The 36 cuft cabinet is ventilated at over 3 ACpM. The hard part is to match an oversized fan/scrubber combination to get the right airflow.
This design and the simple growbox have cooling requirements that exceed the ventilation requirements of the growchamber by at least 15x. Way too much stress on the plants by living in a wind tunnel.
Pros:
single fan design less equipment to purchase
Cons:
Fan operates at 50% or less airflow due to large pressure drop across scrubber
High SP requires a Centrifugal Blower, won't work with Axial fans
Fan/Filter Curves are needed to determine working airflow
Scrubber is many times larger than Ventilation specs to get light cooling airflow
many restrictions in multi chamber designs require special attention to intakes and intrachamber airflow
high airflow for to cool lights creates stress on plants
high airflow through scrubber reduces effectiveness
Centrifugal Blower and Inline Fans are very noisy 60-70 db
3. Simple Cab with CoolTube/Ventilated Hood and Inline Scrubber
CFM = 3.16*(Total Watts)/deltaT
where deltaT = 20 to 30 for cooltube
Intake Area = 2 x Exhaust Area
Fans - Blower or Inline for high pressure drop across scrubber
Example: A 400 W HPS in a 3 x 3 x 4 cabinet needs 63 - 42 CFM of cooling for a 20-30*F temp rise in the exhaust temps with a 1-2 *F rise in the growbox.
The 36 cuft cabinet is ventilated at 2 ACpM. The hard part is to match an oversized fan/scrubber combination to get the right airflow.
The cooltube design is a big improvement over the Simple and Simple cab with Scrubber designs as the overall airflow is considerably less. However 2 ACpM is still 10x over what the plants need and will stress out the plants from excessive airflow.
Pros:
single fan design means less equipment to purchase
Cooltube/Ventilated Hood improves cooling significantly by trapping most of the heat in the hood
Less airflow through the grow chamber compared to the above designs but still high.
Cons:
Fan operates at 50% or less airflow due to large pressure drop across scrubber
High SP requires a Centrifugal Blower, won't work with Axial fans
Fan/Filter Curves are needed to determine working airflow
Scrubber is many times larger than Ventilation specs to get light cooling airflow
many restrictions in multi chamber designs require special attention to intakes and intrachamber airflow
high airflow for to cool lights creates stress on plants where only 0.2 ACpM is needed
high airflow through scrubber reduces effectiveness
Centrifugal Blower and Inline Fans are very noisy 60-70 db
