My bathroom exhaust fan is leaking water, when I went up in the attic, the entire venting tube was filled with water. I had it vented to a mushroom vent in the top of my attic. Like buckets of water..... Why isnt the water leaving via the venting that I have rigged up? Any suggestions how I can re-vent this, or am I doing something wrong? How did that much water accumalate in their? Help!!! We are going to put the house up for sale.