Dryer lint in house? How'd it get there?

[cjeinsanjose]

My mom just moved into a condo and she's had a problem with persistent dust all through the house. We thought maybe it was leaky insulation but we took it to a lab and it turns out to be dryer lint. We're floored as to how the lint could be getting back into the house. The dryer is in a room off the kitchen and does a long, circuitous exhaust exit to the driveway. The condo is two stories and the lint is most pronounced on the second floor! Anybody know how this could be happening?

cjeinsanjose

[HayZee518]

check the joints on the galvanized piping going outside. at each joint wrap some duct tape. no galvanized duct is air tight with push together connections.