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OfflineNewbie2626
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Some help with flow hood needed
    #22392430 - 10/17/15 09:38 AM (8 years, 3 months ago)

Ok guys, i've decided to build a flow hood but i'm a bit confused with matching the blower/fan with the filter.

If the filter's air flow rating is 1200m3/h or 706 cfm, should the blower be a 1200 m3/h or 706 cfm blower?

I'm confused about this because i have have seen a few tutorials online where people use a filter with a cfm rating of 825 and a blower that's only 300cfm.

I really need my flow hood up and running this coming week and your help will be much appreciated.


Edited by Newbie2626 (10/17/15 09:40 AM)


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OnlineLogicaL ChaosM
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Re: Some help with flow hood needed [Re: Newbie2626]
    #22392472 - 10/17/15 09:49 AM (8 years, 3 months ago)

The air filters flow rating is likely the MAX amount of air flow it can handle.

So its advised you get a blower with a lower flow rating.

Also, why not use a SAB instead of an expensive flow hood?


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Invisiblemicro
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Re: Some help with flow hood needed [Re: LogicaL Chaos]
    #22392517 - 10/17/15 09:58 AM (8 years, 3 months ago)

Why not use a bunsen burner? :V


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OfflineNewbie2626
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Re: Some help with flow hood needed [Re: LogicaL Chaos]
    #22392581 - 10/17/15 10:12 AM (8 years, 3 months ago)

I have SAB at the moment but it's really not comfortable to work in at all. The flow hood will just make such a big difference for me. I can get more done in a day with a flow hood also.

The filter i am getting is 610mm x 1200mm so i have quite a bit of work space. Would this fan then be fine for this filter? I can get a speed control for the fan also. This is the fan i'm thinking will work: http://hydor.co.za/images/hit.pdf
The HIT 250. The 350 i think is a bit much


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Re: Some help with flow hood needed [Re: Newbie2626]
    #22392596 - 10/17/15 10:13 AM (8 years, 3 months ago)

logical chaos was right on

it's a rating

so, the max it can handle


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OfflineNewbie2626
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Re: Some help with flow hood needed [Re: micro]
    #22392739 - 10/17/15 10:43 AM (8 years, 3 months ago)

Yes i understand that the rating is the max it can handle. That's not what i asked. Like i said in my first post, i'm confused because there are teks that they use a filter that has a max rating of 825 cfm and use a blower that's only 350 cfm. Hence i need help with this. Math is not my strong suite and i don't really understand how to calculate what i need for that filter.


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Re: Some help with flow hood needed [Re: Newbie2626]
    #22392990 - 10/17/15 11:54 AM (8 years, 3 months ago)

Make a comfortable sized SAB :facepalm: an upside down tote isn't the only way


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Re: Some help with flow hood needed [Re: Newbie2626]
    #22392999 - 10/17/15 11:57 AM (8 years, 3 months ago)

Just get a blower with a rating lower than the filter.

No real math involved, just get a blower with half the CFM as the filter :shrug:

Could you convert a Martha closet into a giant SAB? :strokebeard:


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Invisiblegray
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Re: Some help with flow hood needed [Re: Newbie2626] * 1
    #22393137 - 10/17/15 12:44 PM (8 years, 3 months ago)

Quote:

Newbie2626 said:
Yes i understand that the rating is the max it can handle. That's not what i asked. Like i said in my first post, i'm confused because there are teks that they use a filter that has a max rating of 825 cfm and use a blower that's only 350 cfm. Hence i need help with this. Math is not my strong suite and i don't really understand how to calculate what i need for that filter.




The filter max airflow isn't important as long as you're not trying to exceed it.  You're aiming for an airspeed of 100 feet/min out of your filter.

To determine the blower required first you need to know the size of your filter.    If it's 2 square feet you need to put 200 cfm through it, if it's 4 square feet you need 400 cfm, etc. 

Once you've worked that out and know how much cfm you need, you can work out what blower you need.  No blower has a single cfm specification.  The cfm depends on the filter resistance.  Any decent filter will give it's resistance in pascals or inches/h2o.  Any decent blower will have a graph in the data sheet which shows resistance vs cfm. 

Once you've found a blower which can push out the required cfm at the required resistance, you're golden.

Checkout evilmushroom's build notes.  I also found this blog post useful for specific purchasing links in Europe (UK).


Edited by gray (10/17/15 12:52 PM)


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OfflineNewbie2626
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Re: Some help with flow hood needed [Re: bodhisatta]
    #22396228 - 10/18/15 03:12 AM (8 years, 3 months ago)

Quote:

bodhisatta said:
Make a comfortable sized SAB :facepalm: an upside down tote isn't the only way




I Don't have just a roughtote as a SAB. I have a very nice SAB but i worked in front of a friend's flow hood and it hands down the best and most comfortable. I'll post some pics of my SAB later then you'll see what i mean. I don't want to work in it anymore and want a flow hood. There's a reason people spend the money on a flow hood. It's just easier


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OfflineNewbie2626
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Re: Some help with flow hood needed [Re: LogicaL Chaos]
    #22396230 - 10/18/15 03:13 AM (8 years, 3 months ago)

Thanks for the advice.I really appreciate it


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OfflineNewbie2626
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Re: Some help with flow hood needed [Re: gray]
    #22396233 - 10/18/15 03:16 AM (8 years, 3 months ago)

Quote:

gray said:
Quote:

Newbie2626 said:
Yes i understand that the rating is the max it can handle. That's not what i asked. Like i said in my first post, i'm confused because there are teks that they use a filter that has a max rating of 825 cfm and use a blower that's only 350 cfm. Hence i need help with this. Math is not my strong suite and i don't really understand how to calculate what i need for that filter.




The filter max airflow isn't important as long as you're not trying to exceed it.  You're aiming for an airspeed of 100 feet/min out of your filter.

To determine the blower required first you need to know the size of your filter.    If it's 2 square feet you need to put 200 cfm through it, if it's 4 square feet you need 400 cfm, etc. 

Once you've worked that out and know how much cfm you need, you can work out what blower you need.  No blower has a single cfm specification.  The cfm depends on the filter resistance.  Any decent filter will give it's resistance in pascals or inches/h2o.  Any decent blower will have a graph in the data sheet which shows resistance vs cfm. 

Once you've found a blower which can push out the required cfm at the required resistance, you're golden.

Checkout evilmushroom's build notes.  I also found this blog post useful for specific purchasing links in Europe (UK).





Thanks Gray. That's exactly the information i needed to know which blower to get.


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OnlineLogicaL ChaosM
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Re: Some help with flow hood needed [Re: Newbie2626]
    #22397269 - 10/18/15 11:52 AM (8 years, 3 months ago)

Indeed. Thats somee good info grey :thumbup:


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