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moideen
03-03-2010, 05:39 AM
Can someone help me, how to calculate the extract fan size? I googled. Got different input.
One method is room volume divided by air change
2nd method is room volume multiply to 1.5.
Both are entirely different. Which is correct?

Moideen-Dubai:confused:
eggs
03-03-2010, 07:20 AM
Volume x air change rate = fan

room 6m x 8m x 2.7m = 129.6 m3

6 AC/hr is therefore 6 x 129.6 = 777.6m3/hr
moideen
03-03-2010, 11:30 AM
Volume x air change rate = fan

room 6m x 8m x 2.7m = 129.6 m3

6 AC/hr is therefore 6 x 129.6 = 777.6m3/hr

thanks for replay.getting defferent info from this site.
http://www.alpinefan.com/alpineair_vent_calc.php.
expecting your comment
eggs
03-03-2010, 04:38 PM
thanks for replay.getting defferent info from this site.
http://www.alpinefan.com/alpineair_vent_calc.php.
expecting your comment

Oh, ok then. That's that................

Eggs

<< Eggs walks off confused, playing with his calculator wondering what the sarcastic roll eyes is all about >>
Toosh
03-03-2010, 06:32 PM
Oh, ok then. That's that................

Eggs

<< Eggs walks off confused, playing with his calculator wondering what the sarcastic roll eyes is all about >>

Hi eggs hardly worth the bother at times :eek:

Toosh
frank
03-03-2010, 07:33 PM
As he's not a native English speaker, could this have been lost in transition??

maybe the guy didn't mean anything untoward??
moideen
04-03-2010, 04:44 AM
Oh, ok then. That's that................

Eggs

<< Eggs walks off confused, playing with his calculator wondering what the sarcastic roll eyes is all about >>

sorry eggs.i didnt mean any harassing.if i hurt you,sorry again.

Moideen-dubai
SHERYCOOL
05-03-2010, 03:15 AM
moideen ,thanks for this site.
chemi-cool
05-03-2010, 10:27 AM
Hi Moideen,

There is something confusing in the chart on that web site.
They are working by how many minuets it takes for an 1 air change.

If I use their example, then it is 15 times an hour.

It is actually the same as the distinguished member eggs said but from another angel.

My personal opinion is that to change air in a room, it is better to push air inside then to extract it.

In simple words, the size of the extracting fan is:
Volume of the room X times of air changes per hour = capacity of fan.

Remember to look at Db of noise when you look at the fan's curve.

Good luck.