On 7 Jan 2005 16:19:32 -0500, wrote:

SteveB wrote:

I live in Las Vegas. We use evaporative coolers here. I want to add a
5,000 cfm for one side of my house.

Wow.

I got a bid from a "friend" who is a licensed HVAC person. 24' of 14" dia.
spiral...

With a 5000cfm/1.07ft^2 = 4677 fpm (54 mph) air velocity?



Sounds a little high. That's a fairly large Evap for such a small
duct opening. Usually the openings are a little larger. And these
things do blow a LOT of air if you want them to.
--
Elbridge Gerry, of Massachusetts:

"What, sir, is the use of militia? It is to prevent the
establishment of a standing army, the bane of liberty. . .
Whenever Government means to invade the rights and liberties of
the people, they always attempt to destroy the militia, in order
to raise a standing army upon its ruins." -- Debate, U.S. House
of Representatives, August 17, 1789