I just hired my condo management company (a job performed, at my request, for my unit only, at my own expense, which was almost $300 after tax) to extend the two upstairs bathroom exhausts so that they exhaust to the exterior (through the side) of the unit. (These bathroom exhausts were previously vented directly into the attic before which had been damaging the roof's sheathing)
I was not expecting it to be done this way, but the two exhausts are very close in proximity to each other, and the person who did the work decided to use a shared vent for both exhausts. In other words, what he did was connect a flexible aluminum duct to each vent, and then used some type of "T - connector" to join the two ducts together so they are both sharing the same shared flexible aluminum duct that leads to the exterior the unit.
I happened to notice that when one of the two fans is running, it actually causes some air flow to be exhausted out of the other bathroom's idle fan. If the fan in the main bath is running in the main bathroom, I can actually observe the blades of the fan in the master bath start to spin. Clearly air is being pushed from the main bath into the master bath when this happens. If I briefly turn on the master bath's fan and shut it off I can observe it switch direction after it stops turning in the normal direction.
In the opposite situation (master bath's fan running when the main bath is idle), the problem, to me, seems like it could be less severe. The blades do not move in the main bath's fan. There does seem to be a little bit of air flow though the fan opening, but I suspect not as much as in the previously described situation.
Anyway, I just want to get opinions on whether or not this is worth complaining about, or am I just being too picky? It seems to me that if running one fan causes air to be pushed out of the other fan, this will, most likely, cause some mosture to be transerred into the other bath (how much I don't yet know) rather than the exterior. This seems like a less than ideal setup.
Is this type of shared vent setup for bathroom exhausts considered to be normal/common?
Which of the following do you recommend:
1) Immediately complain about this to the management company tomorrow, since clearly there is a problem with the duct setup chosen for this jobOR
2) should I perform a test to see how much steam actually gets into the master bath when the main bath's fan is running (while showering in the main bath) BEFORE complaining about this?OR
3) Do nothing, since this is a common setup, and likely not worth complaining about.Let me know what you think.
Thanks,
J.