Hengs Fan Amp Draw? - Fiberglass RV


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Old 10-04-2017, 06:22 PM   #1
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Hengs Fan Amp Draw?

Anyone know what the amp draw is on a standard cheap hengs 12vdc roof vent fan? Mine has the 6" diameter blade.
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Old 10-04-2017, 08:37 PM   #2
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The Heng's (90037-C1) 12V Vent Motor listed on Amazon has a 0.85 amp rating. Its printed on the motor label.
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Old 10-04-2017, 11:13 PM   #3
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Thanks! I have seen some that say 0.8 amps and some that say 1.6 amps, I can't read the decal on mine as the bracket is in the way.
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Old 10-04-2017, 11:20 PM   #4
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A smart phone is handy for seeing around corners and the like. Stick it in and take a picture to review at your leisure.
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Old 10-05-2017, 05:11 AM   #5
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smart phone

my mechanic is constantly using his for a light or how about this put it up under a car letting the car down customer taking off!

does this work?

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Old 10-05-2017, 06:19 AM   #6
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If all else fails, use a multimeter to measure the amperage while running.
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Old 10-05-2017, 06:53 AM   #7
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This one was rated @ 1.6 amp, I used it to replace the 3 amp fan in my stove top hood.
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Old 10-05-2017, 08:09 AM   #8
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Quote:
Originally Posted by Johnny M View Post
Thanks! I have seen some that say 0.8 amps and some that say 1.6 amps, I can't read the decal on mine as the bracket is in the way.


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Old 10-05-2017, 08:48 AM   #9
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the amp draw is dependent on the motor and the fan blades used. A change of the blades will make a big difference on the amp draw. The good old mabuchi motors that are used are not very good and draw quite a heavy draw. I have switched over to computer fans for all my vent motors (even my fantastic fan). The amp draw in very low and much quieter operation. I built a housing for the stove vent with 2 smaller fans with a switch to select 1 or 2 fan plus a speed control. My old fantastic fan blade self destructed and I replaced the fan motor and blade with a Bitfenix 230mm fan that moves 160cfm and draws .3 amps(about $20). The cost of these fans are much lower than the cost of replacement motors from a rv shop. Being a computer tech, I have a large selection of fans to choose from from dead power supplies and cases.
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