Grain Bin Roof Exhausters - The Combine Forum
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post #1 of 12 (permalink) Old 08-18-2019, 12:09 PM Thread Starter
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Grain Bin Roof Exhausters

Does anybody have any experience with exhaust fans mounted on top of bins to aid in aeration? I see there are some on the market.
Specifically I would like to try them on our cooling hopper bins. We dump hot out of the dryer into these bins, and always have condensation issues... maybe exhausting from the top would help?

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post #2 of 12 (permalink) Old 08-18-2019, 12:44 PM
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Maybe extra roof vents would help more?


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post #3 of 12 (permalink) Old 08-18-2019, 01:04 PM
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Originally Posted by DDF View Post
Does anybody have any experience with exhaust fans mounted on top of bins to aid in aeration? I see there are some on the market.
Specifically I would like to try them on our cooling hopper bins. We dump hot out of the dryer into these bins, and always have condensation issues... maybe exhausting from the top would help?
I was thinking if the same thing for the same reasons as you. Where did you find the powered exhaust vents.
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post #4 of 12 (permalink) Old 08-18-2019, 02:06 PM
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We dump hot out of the dryer into these bins, and always have condensation issues... maybe exhausting from the top would help?
For this I have heard it is much better to actually have the fan blowing into the roof of the bin to dilute the humid air.
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post #5 of 12 (permalink) Old 08-18-2019, 02:18 PM
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We are in the process of fitting 12” aeration fans in the top of the drags to help with condensation in the bins. Will post pictures as soon as we are done. We also have a fan in the distributor to help as well.
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post #6 of 12 (permalink) Old 08-18-2019, 04:25 PM Thread Starter
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I was thinking if the same thing for the same reasons as you. Where did you find the powered exhaust vents.
I see GSI makes them.
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post #7 of 12 (permalink) Old 08-18-2019, 04:27 PM Thread Starter
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For this I have heard it is much better to actually have the fan blowing into the roof of the bin to dilute the humid air.
Iíve heard that before as well, but I just assumed the guy misspoke because I canít wrap my head around how that would help.
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post #8 of 12 (permalink) Old 08-18-2019, 04:29 PM Thread Starter
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Maybe extra roof vents would help more?
More vents would certainly be an improvement
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post #9 of 12 (permalink) Old 08-18-2019, 06:49 PM
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Iíve heard that before as well, but I just assumed the guy misspoke because I canít wrap my head around how that would help.
The guy that told me this is a member here and he ran the fan discharging from the roof first while dumping hot corn into large flat bottom bins. When that was not satisfactory he flipped it around and said it was a big improvement. This was a few years ago and I think I recall properly.

My guess is that when the fan is set to discharge then it simply can't keep up to the larger fan on the bin bottom and the other side of the bin always has humid air, whereas if it is pumping a stream of cool dry air from the outside then it is keeping the air inside diluted of the hot/humid air from the hot grain. Obviously you will need adequate roof vents to do this. His roof fan was mounted at the lower end of a roof panel.
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post #10 of 12 (permalink) Old 08-18-2019, 06:58 PM Thread Starter
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The guy that told me this is a member here
Funny you say that. The guy that told me about blowing in instead of exhausting told me that he read it on the combine forum. I tried searching for the past thread without success.

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