[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.