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Old 05-24-2009, 07:30 PM   #11
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The 6" vortex inline fan I just put in is rated for 449 CFM, but after adding 20' of 6" duct and two elbows, it dropped to 333 CFM. Even with the temporary hood I put on it still picks up all the vapor coming off the kettle. I also see very little condensate dripping out of the end. I was expecting it to drip out of the fan because that it the low point but nothing yet. That could be because the fan is so far from the intake though.


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Old 05-24-2009, 09:50 PM   #12
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The 6" vortex inline fan I just put in is rated for 449 CFM, but after adding 20' of 6" duct and two elbows, it dropped to 333 CFM.
How'd you measure the drop? Just curious. I just ordered the same inline fan.

What sort of hood are you using? I can't tell from the picture. I just looks like an HVAC diffuser of some sort right? Simple!

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Old 05-25-2009, 01:22 AM   #13
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I used a Shortridge ADM-860C micromanometer with a pitot tube to traverse the duct
The hood is just a rectangular to round duct fitting from HD. Its just semi temporary till I find something better.

Mike

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Old 05-25-2009, 03:03 PM   #14
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I used a Shortridge ADM-860C micromanometer with a pitot tube to traverse the duct
Thanks! I figured it was something special!

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Old 06-12-2009, 08:26 PM   #15
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The Vortex VTX600 in-line 6" duct fan comes with a regular power cord so I build my own speed control for it using a regular 600W wall light dimmer and other spare parts that I had. Looks like this:



The slide control sets the speed, the switch underneath turns it on/off, and the fan plugs into either outlet on the right. Simple.

It works, but it causes the fan motor to emit a low buzz any time the speed's not at 100%. When I measure the output of the dimmer with a voltmeter it's always putting out 115VAC so I take it it's simply chopping off part of the AC sine wave like explained here: HowStuffWorks "How Dimmer Switches Work"

It's not actually changing the output voltage which makes sense as that's more $$$.

So the question is are fan speed controls the same as light dimmers like this? Is the slight buzzing ok for the motor?

Kal

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Old 06-18-2009, 05:11 PM   #16
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Update for my own use (and anyone else who cares): Fan speed controls are not the same as light dimmers. Most fan speed controls have built in noise reducing circuitry to avoid fan 'hum'.

Kal

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Old 06-18-2009, 05:13 PM   #17
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I also see very little condensate dripping out of the end. I was expecting it to drip out of the fan because that it the low point but nothing yet. That could be because the fan is so far from the intake though.
I forgot to ask earlier: Where exactly are you seeing this condensate dripping out? Out of the end of the pipe outside the house? Or somewhere else?

Kal
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Old 06-18-2009, 09:08 PM   #18
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Outside the house at the end of the pipe.

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Old 06-18-2009, 09:19 PM   #19
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Perfect - Thanks! I'll be doing some tests tonight myself.

Kal

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Old 07-11-2010, 01:31 PM   #20
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I'm in the final stages of converting to an all electric indoor brewery. My final major hurdle is designing/purchasing a proper exhaust system.

So please chime in with your experiences and/or pictures of your exhaust setups.

Thanks!
So - how did you solve the problem ?

I am interested in improving on my window fan solution (which is ok for now, but when I goto 10 gal batches, I think I will need something beefier)
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