[hypoxia]

The Kitchen exhaust fan is an Evans Tempcon HV-207321 mounted on the roof and the Evans HV210022 motor was seized.  The fan sucks air from above the refrigerator.  Unfortunately it is always venting and is mounted beside a sewer vent.  There are times the sewer gas comes down the vent which makes it imperative the fan must work.  Evans Tempcon apparently sold out and that assembly wasn't available.  I removed the motor which turned out to be a Unimotor HV033106. I searched and found a Unimotor 35576 at AutoZone listed as a Four Seasons 35576.  The dimensions are slightly different but I was able to make it fit.
                   

[hypoxia]

When we used either of the bathroom Fantastic Vents it sucked in sewer odor through the kitchen exhaust vent.  The kitchen exhaust vent doesn't have a damper on it and vents directly above the refrigerator.  The kitchen vent also had debris entering through the slots which ends up on top of the refrigerator.  I cleaned the refrigerator and added a screen to the vent to help keep debris out.  I mounted a piece of polyethylene plastic between the sewer vent and the kitchen exhaust vent (see photo) which seems to have cured the odor problem.
   

[Jack Houpe]

Jim now thats a perplexing problem, way to close to the vent in my opinion. You might have to put a 90 on it and run it away from the fan for a couple feet.