quietwater-thanx for the link!
I've always wondered how they did this leak procedure..
I've got a spare furnace blower and I think I will give it a whirl--doesn't look too hard-I'll bet that the large hose used is a flex heat duct [I have used them on my house]attached to a chunk of plywood thats attached to the blower and the other end fashioned to an open window [6 in. hole cut into cardboard and taped to an open window]
I wonder if I will need to seal off the stove vent or anything else?
all thats left to do is to get some soapy water and start finding the bubbles!
too bad its anly 3 degrees here in michigan--but when it warms up.....
I will have to research which sealent to use--thanx again QW----jim