.. . . When you turn on the exhaust fan, the sinks and shower gurgle and you then smell sewage. What else do you suppose is happening?
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OK , Spiderman. . .that's easy,
Without even thinking (seriously) about hydraulics or the mechanism involved behind fluid dynamics--it would be fair to say that the fan is oversize.
There are other causes of GURGLING. (save for the morning routine) lol
Sewer system is a close system that needs help from ambient pressure to allow air to replace the atmospheric pressure of 14.7 lbs (atm) at sea level.
This depleted air pressure is evident when the sink is subjected to the waste water being drained.
In a close system --this 14.7 lbs air pressure is missing. You notice when using the airplane toilet when you flush-- it is sucked out by vacuum along with the cabin pressurization.
So much for rudimentary Physics.
Faulty plumbing could cause GURGLING too.
For a properly sized AHU--it should not make annoying noise or even feel the air wheezing by. That's how they check AHU par excellence design. . . and yet moving air efficiently.
Does it gurgle even when a window is open?
It doesn't have to be living in a WIND TUNNEL . . .or next to a sewer treatment plant. (yuck)
Keep the seal water in the trap always topped up. . .that is-- if you want to keep the same size fan.
I wired an AHU to pull air out of a shooting range of a police station in a small city outside L.A.
The shooting range was in the basement and the huge fan was on the roof. They hired an AHU designer (Mechanical Engineer) to do it and you can't feel the air being sucked out.
Before the installation no one could stay there long because of suffocating gun smoke.
And no gurgling from their bathrooms either.