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Old 11-25-2014, 10:22 PM   #1
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venting issues!!


We built our new house 3 years ago. We have a totally self contained suite and their hood fan and laundry vent directly outside. For the past three months every time they cook the smell of stale oil like french fries gets into our venting system upstairs and smells our house up. This happens every night that they use their oven. Venting guys have covered our fresh air vents outside in case it was blowing from their vent into ours, Disnt work. Their is no connection between their venting system and ours yet the smell comes up every evening. Did a smoke test today to see if smoke came up from somewhere and it didn't yet once again tonight smell of a dirty oven coming up again now that they cooked. I am going crazy and it's making my house stink. Venting and furnace guys that installed are baffled!!
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Old 11-25-2014, 11:45 PM   #2
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If single furnace serving the whole building, the air is being pulled into the return vents. That is why you are getting the migrating smell. Along with if your door is closed, but allows for air to come underneath and around. Your exhaust vents and the furnace return is pulling the smells from the rest of the house.



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Old 11-26-2014, 10:42 AM   #3
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Thanks for your reply. The venting system is for the main part of the house only not the suite. It runs through their ceiling in the suite but is totally drywalled in and not exposed at all. There are no vents at all in the suite and they are on baseboard heating. There is no door from the suite to the house and the suite is in no way attached to the house for a smell to come up and is totally self contained so in theory they smell in no way should be getting into our system but it is every time they cook. Our furnace is downstairs but behind a wall in our part of the house not the suite. When the smell comes up it doesn't smell at all in the furnace room downstairs Their bathroom vent goes directly outside as does their hood fan vent. They plugged our fresh air vent just in case it was coming from their vent to our vent outside but that didn't work.
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Old 11-27-2014, 09:57 AM   #4
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Contained does not mean sealed from each other. If walls are shared, connections can be made through any opening in the walls. Gaps in the sheetrock along the floor, electrical opening and boxes (switches, boxes, recess ceiling can lights, cable for the range hood, etc).
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Old 11-27-2014, 10:58 AM   #5
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We were thinking that as well but how would it get into the venting system which is how the smell is coming up. The venting guys say all the pipes and joists are all sealed. I notice the smell comes from all vents but in particular the two return air vents more.
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