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Message: [QUOTE="CL82, post: 4067373, member: 44"] But on the plus side food keeps forever in the near vacuum. I don't remember the details anymore but basically over a certain CFM code requires that a system be put in place to allow airflow back into the house. Being a pragmatic guy, like yourself, I said I can just open the window but was told no it has to be a passive system. So essentially, we spent a lot of money to get our houses as airtight as possible, so that spend of a lot of money to have them drill a hole in the wall to let in more outside air. My wife wanted as big a vent as possible, so big that we would need to tie down our pans with bungies to prevent them from being sucked into the fan. My compromise, was to go with highest CFM I could before the additional venting was needed. I doubt she's noticed. She never turns it on. EDIT: The issue is largely back drafting from the water heater and furnace. See below @2:30 [MEDIA=youtube]4PEs09a2AmU:6[/MEDIA] [/QUOTE]