The lasso whole house fan is very similiar to the house fans sears used to offer back in the day. It installs on the window, along the frame, after the window channel, so the window can be opened / closed with ease. I have used my fan in my apartment in the states, and it does cool the home down , even when its over 90 degrees f outside. The concept for it to work is cross ventilation. So the fan is at 1 window, (exhaust) then you keep another distant window open that sucks in the breeze. This cross- draft is what cools the home.
I didnt consider the rust factor, but the motor is sealed, and parts are coated. This fan works very good, and should be built into the design. These type of fans, on a smaller scale, are used to vent that hot attic. it cost $80 u.s. , and after speaking with mi tia, she remembers having one in her home back when she lived in jersey.
Thanks for the replies, Im just going to bring it to her On my visit.