Fan-tastic vent speed/noise reduction - Fiberglass RV


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Old 05-21-2014, 04:02 PM   #1
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Name: John Michael
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Fan-tastic vent speed/noise reduction

I wanted to slow the speed of my Fan-tastic fan and emailed the fan folks asking how to. They replied with the message below and the attached diagram. Sorry if this is old news. Worked for me. I may add a switch to bypass the resistor on hot days. We will try it this way for awhile and see how it does. So far very nicely.

John Linck
John,
Thank you for contacting Fan-Tastic Vent. Please find the attached instructions to slow fan motor. You’ll find resistors at Radio Shack or similar retailers.
Best regards,
Jerry Watchorn
Technical CSR
Fan-Tastic Vent
Atwood Mobile Products, LLC
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Old 05-21-2014, 04:06 PM   #2
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Yes, you are supposed to install the in line resistor so that the fan cools it. I got tired of doing this, after 4 different times I switched to MaxxFan.
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Old 05-21-2014, 04:21 PM   #3
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This reminds me of the old style light dimmers (Pre solid state) The resistor solved one problem, dimming the lights but created another problem ,getting rid of the heat produced by the resistor . Plus it did nothing for energy conservation
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Old 05-21-2014, 04:28 PM   #4
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I am thinking of putting something like this in my Fantastic fan. At $3.83, it probably costs less then that 10W resistor from Radio Shack.
Hi Q Pulse Width PWM DC Motor Speed Regulator Controller Switch 6V 12V 24V New | eBay

Hi-Q Pulse Width PWM DC Motor Speed Regulator Controller Switch 6V 12V 24V New
Features:

Brand new and high quality.
Input supply voltage: DC 6V-28V.
The maximum output power: 90W(Voltage * Current should be smaller than 90).
The maximum continuous output current : 3A(If current is larger than 3A, enhancement of heat dissipation is required.).
PWM frequency: 21kHz.
Duty Cycle adjustable: 5%-100%.
Size:5cm x 2.8cm .
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Old 05-21-2014, 08:19 PM   #5
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Jim,

I asked Scamp if the MaxxFan was an option. Sadly no. In hindsight I should have installed one myself.

David,

I like your suggestion. Let us know how pulse width control works. Sounds like the best solution.

Thanks to all, john
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Old 05-21-2014, 08:25 PM   #6
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David,

I just ordered your controller suggestion. I have never heard of an adjustable duty cycle, maybe that's just translation meaning variable speed or my ignorance. Anyway it looks good, but if not I have squandered 4 dollars much more recklessly at times. One less beer in Egg Harbor next month.

Cheers, john
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Old 05-21-2014, 08:41 PM   #7
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Adjustable duty cycle = variable on vs. off time, or pulse width modulation. A standard DC speed control. Since the switching frequency is 21 kHz, it should be basically silent.

If you have installed a reversing switch, it may be a good idea to put it down stream of the speed control, which seems to have a polarity to it.
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Old 05-23-2014, 02:10 AM   #8
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The motor speed control mentioned is rated at 3 Amps. Seems to me that a large fan might use more that 3 Amps.
Frank F
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Old 05-23-2014, 05:02 AM   #9
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The big benefit to a pulse width modulated control is it allows a wide range of control. A properly designed controller should allow you to slow the motor to the point where you can see the shaft rotate. The controller provides full voltage at shortened intervals. The resistor reduces the voltage to the motor. Too large a resistor and the motor stalls. The down side to the controller is where to put it. It will need some ventilation. Raz
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Old 05-23-2014, 09:21 AM   #10
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Our range hood exhaust fan was either screaming, or nothing. Very annoying. I installed a rheostat in series and we are both very happy, it works well. The amount of time that we use the range hood is short, so I am not too worried about the wasted power. I do not have any commercial info on the rheostat, it is something I've had in my collection of "useful" stuff, probably for decades. I am a pack rat, and it has paid off many times. Just need to remind my DW every time I save big bucks.
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Old 05-23-2014, 09:33 AM   #11
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Quote:
Originally Posted by frankcfx View Post
The motor speed control mentioned is rated at 3 Amps. Seems to me that a large fan might use more that 3 Amps.
Frank F
The fan is rated at 3 amps.
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Old 05-26-2014, 07:01 PM   #12
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Well, I bought a Maxxair fan off of kijiji today. It is the 5100 model, but an older version. It has only three speeds, and a dial thermostat that has no units on it. It is reversible though. Not a screaming deal at $170, but it was brand new in the box.

It is rated at 4.4 Amps. So to add better speed control, I purchased this unit today.
6V 12 24V 10A Pulse Width Modulator PWM DC Motor Speed Control Switch Controller | eBay

Specification:
Model: CCM6C
Input voltage: 6V/12V /24V DC
Control Power: 24V, within 200W; 12V , within 200W; 6V , within 60W
Current: Sustained current maximum 20A, suggest use within 10A
PWM Duty Cycle:5% -100%
PWM Frequency:21khz
Material: Plastic, metal
Size (L*W*H):6 x 5 x 2.7cm/2.36"x1.96"x1.06"(approx)

At $5.06, it is not much more expensive then the 3A model. It is also larger, so it may not fit, but it should be interesting. Otherwise the specs are almost the same.
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Old 10-25-2017, 07:49 AM   #13
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I tried the pwm control. Wow! Very nice and working great after 3 years.

John

Pic from Michigan's Upper Pennisula during fall color.
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Old 10-25-2017, 09:08 AM   #14
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Name: bob
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complicated

I look at those transittors, diodes, resistors and the big heat sink makes me cringe. So many things to go out or wrong!

guess this is the new age of anything?

bob
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