I am waiting for a return call from the furnace guy, but maybe someone can ease my fears.... Got a new high efficientcy furnace put in last fall, propane. It has a warranty thank god, hopefully it covers three year old children. I'm having a garage sale, and the kiddo knows how to turn the hose on and off, and she has a kiddie pool she generelly plays with, or just hoses herself off. Well, I went back, and as I went through the house, heard running water in the basement - which is common when it rains here, old michigan basement (and a nice sealed furnace now because of the water there). She had the hose DOWN one of the exhaust? vents - there are two PVC vents that come out, one is short and bends down, one is long and snakes up. She had it in the "up" one. She's also informed me she has rocks in there. I want to pull out my hair. Did she just destroy our new furnace??? I don't even know where the power switch is for the darn thing, it's not running and hasn't because it's hot here, but still. Ugh.