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This fan curve is for CFM fan that will produce 0. When the fan is fully blocked, it creates 0. The fan oper- ates with the same shaped curve, just shifted outwards or inwards depending on speed. If you took a big fan and connected it to your growbox, then put a duct on the exhaust with a damper so the air- flow could be adjusted, then measured the static pressure as the air flow is increased, this curve would be made.

Point A is my cab with an Axial Fan producing 0. Point B is my cab with an Centrifu- gal Blower producing 1. Now let's do something to our cabinet to change the system constant K. Let's say our cabinet has two intakes and Curve A is normal. If we block up one intake, we have changed our system constant K to a new number and we get Curve B. My cab with 2 intakes and an axial fan pro- ducing 0.

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My cab with 1 intake and the same axial fan at 0. In this case a 0. The resistance of the system causes reduced performance. A new operating point is created by chang- ing the speed of the fan without making any changes to the system. This is the same as up- grading from a low performance fan to a heavy duty industrial type. A while back I threw out a simple formula for calculating air flow. Here's a better calculation that takes Area into consideration.

What's interesting is that doubling the intake area will double the air flow. You have to change the pres- sure produced by a fan by 4 times to double the air flow. If you want to improve your cabinet, adding in- takes, increasing duct size and adding more surface area to scrubbers is the way to increase air flow. So what actually makes the Air move? Let's call this the Total Pressure. Resistance to the air flow is called Static Pressure and what's left over is called Ve- locity Pressure. It's the Velocity Pressure that pushes the air.


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The Static Pressure is best described as pressure losses in the system. Static pressure is your enemy in a good ventilation system. If you find your cabinet door hard to open, then you have high static pressure. If you open your cab door and the air flow from the exhaust increases, then you need more intake area. Let's say I have a nice fan that is rated at 0.

Measuring the static pressure at the exhaust I find 0. Here's the full formula for calculating the air velocity in a duct knowing the Velocity Pressure. The Total Static Pres- sure at the fan is 0. The Vp is 0. The Total Static Pressure loss for the system is 0. Wow, the static pressure in cham- bers A and B are the same so there is no more loss and it also dropped the static pressure at the fan inlet to 0. Let's add a second intake. This re- duces the Sp down to 0. In this example by removing an in- ternal restriction and opening up the intakes, the airflow was im- proved from to CFM.

This is the handiest chart that I've ever seen. It's based on a cooling formula that I've come across in a few places during my research. I picked up this graph a long time ago and have verified it against a ventilation program for cooling electronic cabinets. This chart is for the airflow needed to cool a simple cabinet with just a light bulb and enough intake area not to cause any static pressure loss.

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One air exchange per minute is all you need to keep your plants happy. Measure your grow box in feet and multiply height x width x length and that's the CFM you need for one air exchange per minute. At an intake to a duct, Static pressure inside the duct is converted to Velocity pressure which makes the air move. Now all the air around your intake is sitting still and it has to be pulled into the intake and accelerated up to the velocity of the air travelling in the duct.

The duct static pressure and entry losses are related to the size of the vena contracta.

Low Stress Training (LST) Cannabis (iGrow Marijuana Classic)

The shape of the intake is very important in reducing the hood entry losses. Assuming a Fd of 0.

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The way to combat Static Pressure losses at the intakes is to reduce the Velocity of the air at the intake by increasing the area of the intakes. Intake Sizing Sizing intakes causes people lot's of grief so here's all the work done for ya. Diameter Area Inches Square Inches Don't assume that a 4" exhaust needs four 1" inch PVC intakes. You really need 16 to match the exhaust area and up to 32 to make it work right.

Darkroom Vents I see lot's of guys using darkroom vents which are an excellent way to light trap the intake. Our ears are some pretty special instruments that can pick up very faint sounds to all the way to a rock concert at over db. Noise level is computed using the formula 10Log Sound Pressure Level. A db rock concert is times louder than a whisper. Bathroom fans are measured in Sonnes to make it easy for the average shopper to compare noise levels.


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A high quality bathroom fan runs 1 sonne and most of the cheaper ones are 3 sonnes or about 55 db. Computer fans are very quiet at db compared to bathroom fans at 55 db or centrifical fans at db. While we are talking about noise, a big source of noise in ventilation comes from the rushing sound of the air itself.

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My suggestion is to increase the duct size or connect the duct to a large cardboard box to drop the air speed down while main- taining the air flow rate. Increase the area of the ducting to drop the airspeed. Add a grill or grid to even out the flow of air to reduce turbulence and the noise will be significantly reduced.

Case Study One of the key features of a good growbox design is fitting a carbon scrubber to the ventilation system.

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They publish decent spec's with their equipment. This is a workhorse of a fan. Well let's take a look. So what gives, the filter is supposed to give CFM 0.

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This is where the fan curve is needed to see how both these components make a system where the actual airflow is the operating point where the two curves cross. Holy cow this thing is loud. No wonder, look at the noise spec. Look up 70db, its a vacuum cleaner loud or the same as radio or TV music. Am I happy? So what are my options. Add a speed controller, box runs hotter. Downsize the lights?

Leave the door open? This is caveman engineering by Fred and Barney. An alternative is to run unrestricted quiet fans to cool the lights. A high airflow, low noise computer fan will run with db which is whisper quiet compared to this hoover. Cool, quiet and smell free.