Thread: Floor fan ventilation

Bob would be the best person to chime in on this, but start with info on hydroponics fans. They are way more efficient than a standard fan and take up way less room.

Just to put some numbers on the table, and drawing from memory ...

To control dust you want about 20 air changes per hour, so for a 250 cubic metres volume, you need to move about 5000 cu.m per hour.
3 of the largest vans above would achieve that rate. Given their size, they could be installed through a "hole in a wall".
Of course, if you're pulling 5000 cu.m from a space, you need to pull in the same amount from a clean (and during summer cool) area.

You could use something like that but you have to fit it into the window and then protect it from the weather when you aren't using it. Better in my opinion is a shuttered fan like the ones used in barns and greenhouses. When on the shutters open and when off, close to keep the weather and birds out. They will cost more though but that is offset by not having to fit the portable into an opening.

Pete

I agree with 5000 m3/hr and I have seen the 20 volumes number, it's what made me start looking at big fans including things like 16" car radiator fans.

but by my calcs

3 x 12" fans = ~5250 m3/hr, 945 W and roughly $1000?
1 x 450mm fan = 124 m3/min (7500 m3/hr), 165 W and roughly $100

it would have to run at about 70% of advertised value before it hits the hydroponics fans advertised value... which does seem very possible (especially with a bit of dust on their blades) but I haven't been able to find anything on how accurate inline fan values are.

As for cool air my plan is to locate it on the afternoon sun side of the house and pull air from open windows on the shaded side. the window that I was going to attach it to is actually an old glass louvered window so if it rains I can always close it (though rain never blows in on that side of the house unless hell is rising).