On Mon, 5 Mar 2007 14:28:56 -0500, "EXT"
wrote:


"mm" wrote in message
Admittedly our ranch house was built about 57 years ago, but it had a
gas furnace in the garage.

I'd like to know who runs a car in the garage. You don't have to have
a furnace there. What about the people who are actually in the garage
for one reason or another.

The reason the laws are there is not for people who don't run a car in the
garage but for
safety in case someone does leave one running, it has happened and can

That makes perfect sense. Didn't think of that. Although the guy
from Atlanta didn't seem to think that was the law everywhere.

And there must be 10's of thousands of furnaces in garages in Indiana
alone, built prior to any law.

happen. The laws require a vapor proof seal between the house and the
garage. Also gasoline can leak or at least evaporate and being heavier than
air, it can pool on the floor. Most areas require any flames, furnaces to
heat the garage, and even electrical outlets to be no lower than 48 inches
above the floor. Also if there is a garage has a fire, and cars have had
electrical problems that caused fires when nobody is around, there should be
a one hour firewall between the occupied area of the house and the garage. A
furnace blowing air from the garage to the house would quickly facilitate
the spread of the fire or carbon monoxide through the ducts to the house.

Why would air or CO in the garage, that is mixed with oil or gas and
burnt in the furnace, get into the house? Is't the heat exchanger
meant to separate combustion air from house air?