Home | Community | Message Board


Original Seeds Store - Cannabis Seeds
Please support our sponsors.

Mushrooms, Mycology and Psychedelics >> Mushroom Cultivation

Welcome to the Shroomery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Amazon Shop for: HEPA Filter, Laminar Flow Hood

Jump to first unread post. Pages: 1
OfflineJpilot
Stranger
Male
Registered: 01/16/05
Posts: 17
Loc: Netherlands, The
Last seen: 9 years, 8 months
Construction of a flowhood
    #4518257 - 08/10/05 03:04 PM (11 years, 4 months ago)

Hi there,

Some months ago i bought a HEPA filer of 610x610x290mm. But the problem is witch fan should I use ?
Of course I searched the forums, it took me a few days to read all the flow hood topics ( a LOT of off topic replies in there :laugh: )
Anyhow, the only problem is all the calculations are with US measurements.

OK my plans:
I have painted some designs, but I want to use the one on the bottom. That way the flow hood would be a lot smaller.
http://home.wanadoo.nl/anrostang/flowhood.JPG

This is my filter:
http://home.wanadoo.nl/anrostang/smartboard/hepa.jpg
Of course you need some information about this beauty. As I said it is a 610x610x290mm HEPA filter. On top of it there is a little sticker witch gives the following info:
2385 m3/hour @ 250 Pa

I found the calculation's on www.fungifun.org/flowhood/ . But to be honest, I have no idea what they are talking about :laugh:

So my question is, is there someone who can help me, or calculate how many m3 I need for this flow hood.

When I have all the materials I'll make a nice picture log.

Kind regards Jpilot


Post Extras: Print Post  Remind Me! Notify Moderator
OfflineJpilot
Stranger
Male
Registered: 01/16/05
Posts: 17
Loc: Netherlands, The
Last seen: 9 years, 8 months
Re: Construction of a flowhood [Re: Jpilot]
    #4525815 - 08/12/05 10:30 AM (11 years, 3 months ago)

Someone gave me a site today, and I think I get it now.

Quote from http://www.orchideenvermehrung.at/english/lfh/choosing.htm
Quote:


Choosing the blower

When choosing the blower we have to make sure that it is able to transport the required quantity of air through the filter pad and the HEPA filter. We know the dimension of the HEPA filter and the required air speed in the working area (0,5 m/s) so we then can calculate the airflow per hour.

width of the HEPA filter:
0,305 m

height of the HEPA filter:
0,61 m

required air speed:
0,5 m/s


airflow = width * height * air speed =
= 0,305 m * 0,61 m * 0,5 m/s =
= 0,093025 m?/s


When we multiply this result by 3600 seconds (60 * 60) we get the airflow in m?/h.

airflow = 0,093025 m?/s * 3600 = 334,89 m?/h


On many English websites you?ll find the airflow in Cubic Foot per Minute (CFM) and not in cubic meters per hour (m?/h). One ft (foot) is 0.3048 m so one cubic foot is 0,0283 m? (0,3048 m * 0,3048 m * 0,3048 m).

1 m?/h = 0,5886 CFM

1 CFM = 1,6990 m?/h


In the next step we have to read from the diagram below how much pressure is necessary to transport 334,89 m?/h air through the HEPA Filter. An airflow of 334,89 m?/h is about 60% of the nominal airflow so the required pressure is 150 Pa.





So I guess it's like this:
0,61*0,61*0,5 = 0,18605 m3/second
0,18605 * 3600 = 669,78 m3/hour
witch is 396,23 CFM

So a 700 m3 blower would be fine for my hepa filter ?
Sounds right ?


Post Extras: Print Post  Remind Me! Notify Moderator
InvisibleRoadkill
Retired Shroomery Mod
Male User Gallery

Registered: 12/11/01
Posts: 22,598
Loc: Snoqualmie, Wa.
Trusted Cultivator
Re: Construction of a flowhood [Re: Jpilot]
    #4525852 - 08/12/05 10:58 AM (11 years, 3 months ago)

I'm not good at this!~

I'd contact Anno and see what he says...his email addy...

http://www.fungifun.org/contact.htm?PHPSESSID=d3738827f95ed665ba619996d5e18992

he is the man to help you with this one!~

tc


--------------------
Laterz, Road

Who the hell you callin crazy?
You wouldn't know what crazy was if Charles Manson was eating froot loops on your front porch!


Brainiac said:
PM the names with on there names, that means they have mushrooms for sale.



Post Extras: Print Post  Remind Me! Notify Moderator
OfflineJpilot
Stranger
Male
Registered: 01/16/05
Posts: 17
Loc: Netherlands, The
Last seen: 9 years, 8 months
Re: Construction of a flowhood [Re: Roadkill]
    #4527283 - 08/12/05 06:53 PM (11 years, 3 months ago)

Someone told me also to contact him. It's the first thing I'll do tomorrow


Post Extras: Print Post  Remind Me! Notify Moderator
Invisibleagar
old hand
 User Gallery

Registered: 11/21/04
Posts: 9,056
Loc: Somewhere Else
Trusted Cultivator
Re: Construction of a flowhood [Re: Jpilot]
    #4527725 - 08/12/05 08:52 PM (11 years, 3 months ago)

Anno could work this out for you, down to the exact cfm. If he isn't so busy - he cannot get to it.

I had the same problem - when I built my first flowhood. How I resolved it was to go with a fan/motor combo that I knew was far more powerful than needed. I simply installed a variable speed electric motor control. So, I could adjust the cfm downward.

OFFON

A candle flame is a good tool to test if you have laminar flow.


My present pride & joy housing came from the factory - with a matched filter & fan :wink:


--------------------


Post Extras: Print Post  Remind Me! Notify Moderator
OfflineJpilot
Stranger
Male
Registered: 01/16/05
Posts: 17
Loc: Netherlands, The
Last seen: 9 years, 8 months
Re: Construction of a flowhood [Re: agar]
    #4529694 - 08/13/05 11:31 AM (11 years, 3 months ago)

Well the problem is I don't have any clue how powerful the blower should be. I think I buy a second hand blower of 1000m3, when my calculations are right that should be way more then I need.


Post Extras: Print Post  Remind Me! Notify Moderator
Jump to top. Pages: 1

Amazon Shop for: HEPA Filter, Laminar Flow Hood

Mushrooms, Mycology and Psychedelics >> Mushroom Cultivation

Similar ThreadsPosterViewsRepliesLast post
* flowhood jmg5 371 1 05/20/06 05:21 PM
by monstermitch
* 2ft x 4ft Flowhood KaptKid 1,398 19 05/14/06 09:13 PM
by KaptKid
* Flowhood Build help with blower (RR?) skateordont 1,305 12 01/31/09 03:40 PM
by CheeWiz
* Flowhood/ multiple smaller filters?
John Nada
490 3 05/06/08 06:22 AM
by John Nada
* question about a flowhood and clean enivroment.... willmafingerdo 1,280 12 05/28/05 01:19 PM
by ohmatic
* My Glove Box Construction – OK? fromthemoon 8,207 10 06/09/11 11:03 AM
by woodylover
* Flowhood using 'Filtrete? Ultra Allergen Filter by 3M' possible? ohmatic 1,091 4 10/10/04 03:37 PM
by ohmatic
* Flowhood/Filter Question? ( eclipse 505 2 07/27/08 07:31 PM
by eclipse

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: Magash, Shroomism, george castanza, Prisoner#1, RogerRabbit, Citric, total, FooMan, 13shrooms, stonesun, EvilMushroom666, cronicr, PussyFart
1,224 topic views. 20 members, 84 guests and 26 web crawlers are browsing this forum.
[ Toggle Favorite | Print Topic | Stats ]
Search this thread:
Sporeworks
Please support our sponsors.

Copyright 1997-2016 Mind Media. Some rights reserved.

Generated in 0.048 seconds spending 0.007 seconds on 14 queries.