OT: Whole house ventilation

Hello Folks,

This is electrical but quite a bit off topic. But maybe some people who live in hot climates know:

Why are whole house ventilation systems by default "whole house fans" that suck air out of the house? Why is there no system available at Home Depot, Lowes or other places that blows air into the house through a filter and then out the screen doors instead of sucking unfiltered air in?

Thing is, when you use a whole house fan you have to leave one or several doors open with just the screens between the outside air and the house. The result is that people regularly find enourmous amounts of dust and pollen inside because everything gets sucked in. All it takes is one gentle breeze through a stand of pines. Before you realize the winds kicking up and rush inside to flip the switch to off it's too late. Makes not sense to me.

Regards, Joerg

http://www.analogconsultants.com
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