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Bad juju. Whether you are starting your own business or going to another employer.

Check the local suppliers, Thermal, RSD, Johnstone, etc. Company's post ad's on there bulletin boards.

Good Luck.

The vent needs to be before the trap. Yes, the unit will suck air though the trap during operation instead of sucking \ holding the water in the trap. The vent can be screened for sanitary concerns.

I have always installed a riser vent prior to the trap to alleviate this problem.

Check your alignment.