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Invisibletrippymang69
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Registered: 03/26/19
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Loc: PNW
Flow hood blower cuts out after a few minutes
    #26753735 - 06/18/20 09:04 AM (3 years, 7 months ago)

Hey everyone, thanks in advance for your help. I finally built my oversized flowhood using items from fungi.com- the HEPA is 48x24 .3 micron and the blower is a 1/2 horse power blower with a static pressure of 1 and 1654 CFM.

I built the hood the same as anyone else, plywood and silicone liberally applied to seal all gaps. I used a 13 MERV (or FPR 10) pre filter in a hole cut out in front of the intake.

I got the flow hood in place and started running it, but the flow was really light, and it seemed to be fighting the prefilter pretty hard, so i took it out. It ran stronger then, bending a lighter back 90 degrees at 1.5-2 feet distance. I thought that might be a little strong, so i reapplied the prefilter and that left the lighter flame at closer to a 45 degree bend. I left it running for a few minutes then all the sudden it cuts out. The fan just stops running (but the circuit doesnt break in the sub panel and the lights stay on).If i unplug and then replug it in it seems to reset and kick itself back on. I thought it was probably fighting to hard to intake through the prefilter so i took it out and ran with no prefilter- its goes for maybe 10 minutes then cuts off. This time unplugging and plugging it in again only gives it the briefest signs of life and then nothing. I tried multiple plugs but it didnt make a difference. I did wire the building, but everything else works in the outlets, just not the flow hood.

Its too difficult to move on my own and obviously i really dont want to open the box up because everything is sealed etc. Does anyone have any advice? As you can imagine im really bummed. It was all very expensive and took a long time to put together, i had everything prepped to work in front of it, and now i have to go back to old school sterile teks :frown:

I didnt not find anything about broken blowers on the forum, unfortunately.

Thanks again folks.


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OfflineRoscoeReturnsS
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Re: Flow hood blower cuts out after a few minutes [Re: trippymang69]
    #26754021 - 06/18/20 11:03 AM (3 years, 7 months ago)

How big is the hole for your intake? If a blower can’t get enough air, it will get hot. Most have a thermal protection that will cut off power before doing any serious damage.


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OfflineSenku
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Re: Flow hood blower cuts out after a few minutes [Re: RoscoeReturns]
    #26754105 - 06/18/20 11:34 AM (3 years, 7 months ago)

:whathesaid:



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Edited by Senku (06/18/20 11:36 AM)


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Invisiblenatedawgnow
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Re: Flow hood blower cuts out after a few minutes [Re: Senku]
    #26754119 - 06/18/20 11:38 AM (3 years, 7 months ago)

I imagine roscoe may be right. Lots of blowers are thermally protected.
Either need to make the prefilter intake hole bigger, make the box that houses
the blower bigger, or get rid of the box all together.


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OfflineSenku
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Re: Flow hood blower cuts out after a few minutes [Re: Senku]
    #26754141 - 06/18/20 11:46 AM (3 years, 7 months ago)

Looks like it's your pre-filter. 13 MERV is an overkill. Motor needs air movement to cool itself down but with that tight pre-filter it's getting such low volume of air and thermal protection kicks in.


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Invisibletrippymang69
Trippy Mang

Registered: 03/26/19
Posts: 11
Loc: PNW
Re: Flow hood blower cuts out after a few minutes [Re: Senku]
    #26754188 - 06/18/20 12:02 PM (3 years, 7 months ago)

Quote:

RoscoeReturns said:
How big is the hole for your intake? If a blower can’t get enough air, it will get hot. Most have a thermal protection that will cut off power before doing any serious damage.




Thank you for the response. I made the hole roughly equal to the hollow center where air comes into the fan, i figured that'd be big enough. Thermal protection shut off definitely fits the bill though- not much else makes sense. i guess ill try expanding the hole and see what happens, not using a pre filter.

Quote:

natedawgnow said:
I imagine roscoe may be right. Lots of blowers are thermally protected.
Either need to make the prefilter intake hole bigger, make the box that houses
the blower bigger, or get rid of the box all together.




What is the purpose of the box in the first place? Making it easier to apply a prefilter? Because the box probably retain more heat inside where the fan is and obviously chokes the intake a little unless you have a huge cut out. thanks for the response!


Quote:

Senku said:
Looks like it's your pre-filter. 13 MERV is an overkill. Motor needs air movement to cool itself down but with that tight pre-filter it's getting such low volume of air and thermal protection kicks in.




Do you know what an ideal MERV # would be for my set up? Thanks for your comments^


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: trippymang69]
    #26754545 - 06/18/20 02:42 PM (3 years, 7 months ago)

Lets see here you have a blower that pushes 1654cfm @ 1" static pressure but you only want to blow 800 cfm @ probably 0.7" static pressure. So your blower is actually way overkill.

What size is the prefilter?

There is no problem running a merv 13 prefilter if you size your blower to the load.

Blowers, particularly very large ones which you have about as big as they get at 120v, have a minimum and maximum static pressure they designed to operate at. It is definitely reaching the thermal cutoff no doubt. What is your blower model? I'd really need to see if you wired it up right, maybe you wired it on low or something i dunno.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


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OfflineSenku
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Re: Flow hood blower cuts out after a few minutes [Re: trippymang69]
    #26754553 - 06/18/20 02:43 PM (3 years, 7 months ago)

I'd use something like this



And since you have really powerful fan for the filter size I'd get and speed controller to get laminar flow. If it pushes 1654CFM the air flow will be turbulent not laminar... Laminar flow is ~100ft/min

For that filter size you need 600CFM fan. Or you can dim down the speed of the existing fan.


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: Senku]
    #26754590 - 06/18/20 02:53 PM (3 years, 7 months ago)

no for that size filter you need 800 cfm @ x" SP not 600 cfm where x is the filter SP @ 100fpm + 0.2" for prefilter. Most commonly this will be 0.7" SP total.

I forgot to ask is the circuit breaker tripping or is the blower just shutting off. If the circuit breaker is tripping then the answer is easier.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


Edited by sandman420 (06/18/20 02:55 PM)


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: sandman420]
    #26754615 - 06/18/20 03:00 PM (3 years, 7 months ago)

I have a feeling you have a 1XJY1 right?


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


Edited by sandman420 (06/18/20 03:00 PM)


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: sandman420]
    #26754631 - 06/18/20 03:05 PM (3 years, 7 months ago)

If so you would need 1.2" SP to get 846 CFM wired on LOW according to the manual. You would have to stack 4+ prefilters + wire it on low to get this static pressure and laminar speed.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: sandman420]
    #26754639 - 06/18/20 03:06 PM (3 years, 7 months ago)

absolutely do not wire a speed controller to that blower


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: sandman420]
    #26754690 - 06/18/20 03:16 PM (3 years, 7 months ago)



--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: sandman420]
    #26754700 - 06/18/20 03:19 PM (3 years, 7 months ago)

So you could try buying 4 standard allergen type prefilters and even leave it on high if the wiring is too hard to mess with it would still be in laminar range. Might have to stack an extra filter on. This might sound countyer intuitive since you claim it wasnt blowing hard enough. But these blower act wild when out of spec. You can cover part of an open blowers intake and it will blow harder because they are not designed to operate on 0 static pressure for example.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


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Invisibletrippymang69
Trippy Mang

Registered: 03/26/19
Posts: 11
Loc: PNW
Re: Flow hood blower cuts out after a few minutes [Re: sandman420]
    #26754768 - 06/18/20 03:46 PM (3 years, 7 months ago)

Quote:

sandman420 said:
If so you would need 1.2" SP to get 846 CFM wired on LOW according to the manual. You would have to stack 4+ prefilters + wire it on low to get this static pressure and laminar speed.




Thanks for all your response. The blower is SKU EAFB4 per Fungi.com so not 1XJY1.

Below (if i did it correctly) is an image of the cut-out around the air intake. you can see my prefilter as well:



I just tried the flow hood again. Once again, it turns on for ~10 minutes and runs great. Then it just cuts out, but does NOT flip the breaker. I wish it was that simple :frown:. I also did not wire it. It came wired with a standard w,3 pronged wall plug. If i was suppose to do anything electrical there was absolutely no mention of it in the package/on their site, and i got no indication it wasnt pre-wired (no loose wires etc.).

I've read that Fungi Perfecti uses higher CFM blowers than are typically used for HEPA filters. Ive read these should function fine, its a matter of preference of how much 'flow' you want. Or Paul is just nickle and diming customers and getting them to buy super spec'd shit they dont need. I do have a hard time imagining such a large fungi supplier would recommend the two items to pair when they dont even work together, it just doesnt really add up to me. I went this direction to avoid having to risk making mistakes with my own calculations.

Lastly, im skeptical to add more prefilter because the flow is SOO light with even one, and it cuts out even faster. My intuition (not that that can be particularly trusted) is telling me it needs more air, not less. I cut a 20x12" pre filter in half, so ill double stack them and see what happens. that should give an indication of whther more prefilter is hurting or helping.

Thanks so much for your time and your thoughts, and any more advice or ideas would be greatly appreciated- ill update you shortly on the doubled pro-filter results.


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: trippymang69]
    #26754865 - 06/18/20 04:20 PM (3 years, 7 months ago)

the EAFB4 is a 1XJY1


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: sandman420]
    #26754906 - 06/18/20 04:34 PM (3 years, 7 months ago)

The thing is every one assumes their hepas are 1.0" sp for some reason when that rating is for when the filter is blowing much faster than 100fpm. Nearly every single HEPA I have ever dealt with (over 10 at this point) has had a 0.5-0.6" SP at laminar speeds and all of the media packs are practically identical there is only like 4 manufacturers. It is possible that their "custom manufacturer" isn't giving them the same filters they used to. The actual SP should be written when tested on the side of the filter and it should show a test speed. Did you happen to take note of this?

On a design note I think your prefilter is also too small. What is that a 12x12? I use a 30x18 for my 30x30 hood. I have the entire top of the prefilter box as the prefilter holder.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: sandman420]
    #26754936 - 06/18/20 04:47 PM (3 years, 7 months ago)

Your prefilter is just way too small at 12x12. Even if you get the proper 800 cfm going through the hepa filter you will have 800 FPM (1sqft@800cfm is 800 fpm) going through your prefilter and they are designed for around 300 FPM or less. So you need a 3 sq ft prefilter for one thing. That may just alleviate your problem if the HEPA filter they sent you is truly 1.0" SP at 100 fpm.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


Edited by sandman420 (06/18/20 04:50 PM)


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OfflineRoscoeReturnsS
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Re: Flow hood blower cuts out after a few minutes [Re: sandman420]
    #26754939 - 06/18/20 04:47 PM (3 years, 7 months ago)

Is your blower housing only slightly larger than the blower itself? Many blowers are not sealed on the motor side, and will pull inlet air on both sides of the squirrel cage. The air pulled in past the motor cools the motor. If the back side of your box is close to the blower, all the air is going through that hole and directly to the squirrel cage. None of it is circulating past the motor to cool it. Either build a bigger box to house the blowe, and use a bigger hole with a pre filter, or just take the box off all together and don’t run a prefilter(that may not be possible with a blower oversized for your hepa).


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Invisiblesandman420
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Re: Flow hood blower cuts out after a few minutes [Re: RoscoeReturns]
    #26754947 - 06/18/20 04:49 PM (3 years, 7 months ago)

Yes that is a good point which would be alleviated if you rebuild the prefilter box for a 3 sq foot filter and use the top of the box for the filter holder instead of the friggin side lol. SWhy did you go with the side you cant even access the blower wiring.


--------------------
- Sandbag Tek - How To Sterilize Spawn Bags - All About Static Pressure / Pressure Drop for DIY Flow Hoods - Sandman's LC Tek-

Marijuanaut escapes earth to cultivate - Grow-room is church temple of the new stoner breed


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