LOL, years ago there was a public restroom (ladies) beset with a horrid aroma. The place was shined and polished, clean enough to eat off the floor and yet the smell persisted. Immediately adjacent was a men's room, all but neglected by the cleaning staff since it didn't stink and it was borderline grotty.
Eventually, someone realized the urinal in the men's leaked and dripped and dribbled enough over time to keep the trap under the floor drain filled with liquid. The floor drain in the ladies room had a trap, but no one ever thought to put any water in it and the ladies were neat enough there wasn't enough slosh on the floor to ever replace the evaporation loss.
So, bear in mind, sewer gases can come up floor drains if their traps run dry.
Eventually, someone realized the urinal in the men's leaked and dripped and dribbled enough over time to keep the trap under the floor drain filled with liquid. The floor drain in the ladies room had a trap, but no one ever thought to put any water in it and the ladies were neat enough there wasn't enough slosh on the floor to ever replace the evaporation loss.
So, bear in mind, sewer gases can come up floor drains if their traps run dry.
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