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GTEED
Stranger


Registered: 12/02/19
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Just built a flowhood. Help with Flame test, airflow rate, and vibrations.
#27132144 - 01/07/21 03:15 AM (3 years, 21 days ago) |
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Well, I have two questions I hope a few people could help me with. First, does my flame appear to achieve the 45-degree angle for the correct 100 FMP from the filter? Second, as you watch the video you will see me start at the bottom and then go up to the top right corner then move to the top left corner. As you will see something happens in the top left corner. It seems to have a higher rate of airflow. Does anyone have any advice on what could be causing this?
I deleted the video. Felt it was not needed any longer.
My flowhood is 18 3/4 inch in depth. That equates to 6 inches for the filter. A 1x2 furring strip, and a 10-inch plenum. I purchased my filter from fungi perfect. It's a 24x24x6. I am using a 1DTU2 blower with it. 3/4 inch maple plywood for the box.
Another crazy thing is I am having to use 5 prefilters and also almost completely block off the amount of air coming into my prefilter box except for around half an inch of a gap for air. This is causing a strong vibration. Things will move around on the little wire shelf infront of the hood.

Any suggestions?
Edited by GTEED (01/08/21 12:22 AM)
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Killerclowns87
Homie



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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: GTEED]
#27132226 - 01/07/21 05:44 AM (3 years, 21 days ago) |
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GTEED
Stranger


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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: Killerclowns87]
#27132279 - 01/07/21 06:37 AM (3 years, 21 days ago) |
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Actually Killerclown87, This blower is exactly what fungiperfect sells to go along with this filter. I just decided to buy it on amazon cheaper. If you go look at the graphs for blowers on grainger's website this blower is the only one that has CFM's needed at the static pressure.
Yes, Prefilters are new. 3 of one brand 2 of another. Im considering Getting these https://www.walmart.com/ip/Filtrete-18x24x1-Healthy-Living-Advanced-Allergen-Reduction-HVAC-Furnace-Air-Filter-1500-MPR-Pack-of-4-Filters/199138068
On fungi perfects website it states (also on the filter sticker) the static pressure is 1.0wg. So buy saying 1.2wg with prefilter looking at the chart for the 1DTU2 blower it was the blower required to produce at least 400 cfm at 1.2wg for a 24x24x6.
It does seem quite a bit overpowered for this size filter, but am unaware of a blower fan that would suffice. The 1DTU2 is what many of the other people have used from my searches. I guess others have just not posted that it has such strength. When I have it choked down to that 1/2 inch gap I believe the flow is correct. That is what I would like for someone to verify from my video. Also, that person should keep an eye out for the difference of airflow at the end of my test. Maybe someone has some experience with the issue.
Edited by GTEED (01/07/21 07:06 AM)
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ironcap
Softy

Registered: 08/14/20
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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: GTEED]
#27132319 - 01/07/21 07:16 AM (3 years, 21 days ago) |
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3/4" maple plywood! That is quite a frame.
The upper left corner appears to be a higher velocity air stream that comes close to blowing out the flame. This could caused by a gap between the filter and frame or some sort of open in the filter itself.
Closing down your air inlet to 1/2" is not going to work well for the long term. What does your flame test look like without closing down the inlet?
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GTEED
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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: ironcap]
#27132430 - 01/07/21 08:39 AM (3 years, 21 days ago) |
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Quote:
ironcap said: 3/4" maple plywood! That is quite a frame.
The upper left corner appears to be a higher velocity air stream that comes close to blowing out the flame. This could caused by a gap between the filter and frame or some sort of open in the filter itself.
Closing down your air inlet to 1/2" is not going to work well for the long term. What does your flame test look like without closing down the inlet?
Without having the inlet closed almost fully the flame is pretty much a straight 90-degree angle I believe.
I bought a crappy cheap anemometer from amazon and without any blockage of the inlet the airflow was up into the 300's fpm. 1.4 - 1.7 m/s. The anemometer wasn't picking up anything under .7 m/s so I returning it. It cost $20.
Yeah I wish that having the inlet closed so much wasnot needed. I was really hoping one or two prefilters would have done the job. Not 5 plus almost fully blocked inlet.
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Marxcelium
Mushroom Instrumentality Project

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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: GTEED]
#27132584 - 01/07/21 10:11 AM (3 years, 21 days ago) |
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There was a thread a while back that I can't find now where a member who bought an entire hood from FP was getting a much higher flow rate than they expected, and, when they called FP to ask about it, they were told that they designed their hoods this way on purpose and that the higher flow rate is good. Take that with a grain of salt since it's all second hand and cuts against everything I know (admittedly little) about laminar flow, but you might contact FP and see if they tell you the same thing. It's weird they'd sell this filter/fan combo if they expect you to choke down the flow to such an extreme.
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cutie
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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: Marxcelium]
#27132650 - 01/07/21 10:45 AM (3 years, 21 days ago) |
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I’ve bought the same exact filter and fan, yet to set it up. I’m under the impression I’ll be adding prefilters and a variable speed controller so that I can regulate the flow down to where I need it to be. The longevity of the system will be better because you can just increase the speed controller as the fan / filter loses efficiency.
That and Stamets just wants our money.
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Marxcelium
Mushroom Instrumentality Project

Registered: 05/12/20
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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: cutie] 1
#27132711 - 01/07/21 11:13 AM (3 years, 21 days ago) |
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Just as a heads up, when I was researching my own build a while back, a friend in HVAC told me that variable speed controllers will greatly reduce the life of the blower and generate lots of heat. I know tons of members use them, but just wanted to throw that out there.
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micelio
Song of Silence


Registered: 04/22/14
Posts: 1,547
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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: cutie] 1
#27132730 - 01/07/21 11:24 AM (3 years, 21 days ago) |
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I wouldn't use a speed controller on that blower.
one pre-filter is all you need.
Restrict your air intake at the blower with duck tape and cardboard or sheet metal or thin plywood.
As you restrict your airflow your amperage draw will go down. (good)
The next size down in size blower would be under your requirement, That's why It's better to be over than under.
If possible rig up some kind of sliding restriction plate that mounts to the top intake hole on your upper box. I'm using a plexiglass that slides in and out so I can easily adjust my airflow. When I'm cooling down my pc in the flow I open the slider so I get a lot more volume of air for faster cooling.
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GTEED
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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: micelio]
#27134219 - 01/07/21 10:54 PM (3 years, 20 days ago) |
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Yeah it states that speed controlers are not recamended for the 1TDU2 blower.
Okay i will give the restriction thing at the blower a chance.
I found out why in the video I posted my flame was a little erratic/forceful in the top left corner. I had a gap next to the filter where I guess air was not being pushed out through the filter and it was causing turbulence I guess.
Has anyone had a chance to watch the video and tell me if that looks like 45 degrees to them?
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micelio
Song of Silence


Registered: 04/22/14
Posts: 1,547
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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: GTEED]
#27134237 - 01/07/21 11:06 PM (3 years, 20 days ago) |
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The flame looks perfect.
I always try working as close as I can to the filter.. It's just a habit I have..
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GTEED
Stranger


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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: micelio]
#27134313 - 01/08/21 12:26 AM (3 years, 20 days ago) |
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Well I took your advice micelio and blocked off the inlet at the blower itself instead of blocking it off at the prefilter box. It helped magicly. Now I am only using 1 prefilter instead of 5 Vibration is alot better but still not perfect, but i can work with that.
Here are pictures of the new flame. How does the flame look in these pictures? Good enough? I wish I could afford a good accurate anemometer, but the flowhood has wiped out my bank account.
Edited by GTEED (01/08/21 12:29 AM)
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Professor X
School for the Gifted



Registered: 04/18/19
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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: GTEED]
#27134342 - 01/08/21 12:51 AM (3 years, 20 days ago) |
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The flame looks good. The benchmark test os with a bottle and some incense. The smoke should slowly wrap the bottle evenly, no swirls or uneven rates.
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GTEED
Stranger


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Re: Just built a flowhood. Help with Flame, airflow rate, and vibrations. [Re: Professor X]
#27134353 - 01/08/21 01:03 AM (3 years, 20 days ago) |
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Quote:
Professor X said: The flame looks good. The benchmark test os with a bottle and some incense. The smoke should slowly wrap the bottle evenly, no swirls or uneven rates.
I just bought some incense. I'll give it a try with a bottle.
When I was playing with the incense earlier It seems like the smoke is going up in a 45-degree angle also. Is this normal or should it be a 90-degree horizontal flow?
Edited by GTEED (01/08/21 01:04 AM)
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