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Either a backdraft damper was never installed in the ductwork or the damper is stuck open...
Has it always been this way?? If so then the damper probably was never installed and you will need to have one installed to stop the air...
If it was good at the beginning and now is not then the damper is stuck open...you will need to find it and then get it working agian...
The dampers often are right at the outlet of the hood...if you take down the hood it should be right there...
You could contat any viking dealer and they would be able to help you, or you could go online to viking.com; finally you might find a replacement knob at a hardware store like a Valu where they usually have a large assortment to choose from.
think i would call viking back and ask for refund of inspection fee and go by the bad switch scenerio the electrician said new fan that would be considered flaws in workmanship in most states dont know where you are located but pretty much same anywhere most inspectors for these companies always try to blame problems off on installers hold your ground and make them fix it and refund that" inspection " fee I've been doing electrical work for several (20+) years it takes longer than 5 minutes to troubleshoot something like that good luck
It appears to me that each hood has a fan discharging air and odours into a common duct.
The only solution to me is to have a main exhaust fan at the very end of the duct continually sucking the air out of the duct.This way it will not allow the individual hood fans to pressurise the main duct,forcing the air to esape through the path of least resistance,which happens to be the neighboars hood.
It may be that such a fan is existent but switched off due to malfunction,or switched off for running costs reasons.