I just bought a house with a Trane XB90 furnace. Now that the furnace is coming on, I noticed a wet spot under one of the two 90 degree elbow fittings on 2" PVC induction vent. On further inspection, I saw that the joint had purple primer, but no cement, and I could just pull the pipe out of the elbow. With the pipe pulled out of the elbow, I could see some water inside a short horizontal run. How much water should be coming out of the induction motor in a humid climate (SF bay area)?