Frank, Unless you are keeping your Corvairs in the house, I fail to see the connection. Later, JR ----- Original Message ----- From: <FrankCB at aol.com> I use a simple (but well > made) low HP attic fan that blows air FROM the house into the attic and > out > the vents at each end. BIG BIG SNIP > Frank "likes gauges" Burkhard >