Supernatural
Member
Hi, new here so apologise for having the audacity to start a thread so soon. I've had a look at some of the fans and filters on the market and come up with what looks to be possibly better than 4"ruck/rhino combos or 12/240V axial fan + DIY CF. Hoping people with more experience than I could pick any flaws in my reasoning.
Backgound:
I have built a bedside table for the purpose of growing. Inside dimensions in mm are roughly 600H x 360W x 360D. I have 5No. 23W CFLs hooked up in parallel horizontally mounted at the top of the cabinet. At the top of the back I have installed an 80mm silent PC fan to extract. Intake is at the bottom of the back and is almost twice the area of the exhaust. The PC fan is more than sufficient even when taken back to 6V to keep the heat from the lights under control and keep a good level of air flow. I can't imagine the PC fan is going to be up to the job of pushing into an external carbon filter.
I intend to make use of the weather and start off outdoors with a Snowryder auto but will want to use the bedside table to dry in 10 weeks time. Also, if things get too smelly in the back garden I want the option of bringing her (fem seed, I can hope) in to finish in the filtered box. This means getting started on odor solutions sooner rather than later.
Aim:
Find fan filter combo that is quiet and has a fairly low Q whilst still having the power to not choke on the carbon filter.
What I propose to use:
I have found that the CAN 2600 (100mm x 450mm) by Can filter has:
Pressure drop at max cfm: 42pa / .20"wg
Max Recirculating (Scrubbing) CFM: 90 cfm / 142 m³h
Max Exhaust CFM: 42 cfm / 71 m³h
This is much lower pressure drop than most other commercial filters which are usually 180Pa.
The S&P Silent 100 (air flow chart attached below) is quiet, low power and seems to have just about enough poke to drive the carbon filter.
(couldn't find how to upload the image so I linked it, hope it's ok)
What I am unsure of is the pressure drop curve of the carbon filter. . . Can I assume that to be of a similar (but opposite) gradient to the airflow curve of the fan? This would suggest that I would end up with a Q of just under 40m3h which is within the carbon filter's spec and more than enough for the purpose of ventilating the tiny cab.
The advantages of this over the Ruck/Rhino are that the fan can fit fairly flush within the cab, run quieter without need of a fan controller, use much less electricity and cost about £40 less. I feel the Ruck/Rhino 4" combo are undoubtably quality units (isn't CAN filter on a par with Rhino?) but probably over engineered for such a tiny space that is only likely to have 1 plant at a time.
If I have made some massive cockup somewhere or have missed something, please let me know. Thanks for reading this far; I'd appreciate your thoughts.
Backgound:
I have built a bedside table for the purpose of growing. Inside dimensions in mm are roughly 600H x 360W x 360D. I have 5No. 23W CFLs hooked up in parallel horizontally mounted at the top of the cabinet. At the top of the back I have installed an 80mm silent PC fan to extract. Intake is at the bottom of the back and is almost twice the area of the exhaust. The PC fan is more than sufficient even when taken back to 6V to keep the heat from the lights under control and keep a good level of air flow. I can't imagine the PC fan is going to be up to the job of pushing into an external carbon filter.
I intend to make use of the weather and start off outdoors with a Snowryder auto but will want to use the bedside table to dry in 10 weeks time. Also, if things get too smelly in the back garden I want the option of bringing her (fem seed, I can hope) in to finish in the filtered box. This means getting started on odor solutions sooner rather than later.
Aim:
Find fan filter combo that is quiet and has a fairly low Q whilst still having the power to not choke on the carbon filter.
What I propose to use:
I have found that the CAN 2600 (100mm x 450mm) by Can filter has:
Pressure drop at max cfm: 42pa / .20"wg
Max Recirculating (Scrubbing) CFM: 90 cfm / 142 m³h
Max Exhaust CFM: 42 cfm / 71 m³h
This is much lower pressure drop than most other commercial filters which are usually 180Pa.
The S&P Silent 100 (air flow chart attached below) is quiet, low power and seems to have just about enough poke to drive the carbon filter.
(couldn't find how to upload the image so I linked it, hope it's ok)
What I am unsure of is the pressure drop curve of the carbon filter. . . Can I assume that to be of a similar (but opposite) gradient to the airflow curve of the fan? This would suggest that I would end up with a Q of just under 40m3h which is within the carbon filter's spec and more than enough for the purpose of ventilating the tiny cab.
The advantages of this over the Ruck/Rhino are that the fan can fit fairly flush within the cab, run quieter without need of a fan controller, use much less electricity and cost about £40 less. I feel the Ruck/Rhino 4" combo are undoubtably quality units (isn't CAN filter on a par with Rhino?) but probably over engineered for such a tiny space that is only likely to have 1 plant at a time.
If I have made some massive cockup somewhere or have missed something, please let me know. Thanks for reading this far; I'd appreciate your thoughts.
