This is actually the first time I hear of these and they sound quite interesting yet simple of a concept. Makes perfect sense. Would be perfect for where I live as we get a heat wave or two once per year and while lot of people have AC, often outside air can be used outside of normal day hours. Could turn it on at night to renew the inside air and the house would be cool for rest of the day.
The main factor you want to look at is CFM. That's how much cubic feet of air per minute it will empty at zero static pressure. There will always be some static pressure caused by obstacles etc so you won't get the number it says, but the higher it is, the more you will get.
I would also imagine blower type fans will have more power as far as being able to pull air even through lot of static pressure, but the ones I see seem to be fans and not blowers. You don't want it TOO powerful either or you'll get the door in the head when you open it. :laughing: (you'll know what I mean if ever you've had your ducts cleaned when they bring in a huge fan)
I will research these more myself but they really sound interesting and I may consider one for my house even.
The main factor you want to look at is CFM. That's how much cubic feet of air per minute it will empty at zero static pressure. There will always be some static pressure caused by obstacles etc so you won't get the number it says, but the higher it is, the more you will get.
I would also imagine blower type fans will have more power as far as being able to pull air even through lot of static pressure, but the ones I see seem to be fans and not blowers. You don't want it TOO powerful either or you'll get the door in the head when you open it. :laughing: (you'll know what I mean if ever you've had your ducts cleaned when they bring in a huge fan)
I will research these more myself but they really sound interesting and I may consider one for my house even.