Yellow Liquid in Bath Fan Vent

[CNewhouse]

Any ideas as to how this could happen? The vent was quite long and had a sag in it, but I wouldn't think condensation would create so much volume or be so yellow. My best guess is that a disgruntled handyman... peed... in the vent? Large amount of liquid. I'd say more than a cup. Very very yellow. I considered lowering my respirator for a sniff but decided against it.

[Jim Katen]

I think you could easily get that much condensation inside a long uninsulated duct - especially given the cold weather we had a few weeks back. 

That much stale urine would have taken on a cloudy appearance after only a few days and it would seriously reek. 

[CNewhouse]

I see. How about the color?

[Jim Katen]

No idea. 

[Tom Breslawski]

Dirt in the vent hose?

 

[ejager]

You disconnected the vent piping to shoot a picture inside?

[Jim Katen]

In our area, 90% of the bath exhaust ducts stop a foot or so away from the vent jacks. No need to disconnect them because no one ever connected them in the first place.