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Moisture experts - kitchen vent problem
Posted on 7/13/23 at 1:52 pm
Posted on 7/13/23 at 1:52 pm
We added a kitchen vent over our range and just noticed the last few days there is a ton of condensation around the fan.
The range is on an inside wall, so the vent goes up into the floor joists of the second floor, then runs horizontally across the kitchen ceiling to an outside wall.
On the outside wall, there is an external vent housing with a swinging door on it that opens when the fan is on and closes when it's off.
I assume what is happening is that when our A/C is running and the kitchen vent is not on, the A/C system must be pulling moist outside air into the vent, and when that air gets the the fan inside the kitchen cabinet it then condenses and thus the water.
I *think* the outside vent door has a rubber seal around it that should prevent air backflowing into it.
Is there anything else that might be a problem? IE, air around vent pipe between the floor joists?
Thoughts?
The range is on an inside wall, so the vent goes up into the floor joists of the second floor, then runs horizontally across the kitchen ceiling to an outside wall.
On the outside wall, there is an external vent housing with a swinging door on it that opens when the fan is on and closes when it's off.
I assume what is happening is that when our A/C is running and the kitchen vent is not on, the A/C system must be pulling moist outside air into the vent, and when that air gets the the fan inside the kitchen cabinet it then condenses and thus the water.
I *think* the outside vent door has a rubber seal around it that should prevent air backflowing into it.
Is there anything else that might be a problem? IE, air around vent pipe between the floor joists?
Thoughts?
This post was edited on 7/13/23 at 1:56 pm
4
Posted on 7/13/23 at 2:05 pm to Meauxjeaux
What is the room above this area?
Posted on 7/13/23 at 2:14 pm to LSUDad
There's a second floor bedroom above it.
To run the vent pipe to the outside, we took up the flooring upstairs to access the joists.
One of the joists *might* be close to unfinished attic space.
Making another image for better explanation.
To run the vent pipe to the outside, we took up the flooring upstairs to access the joists.
One of the joists *might* be close to unfinished attic space.
Making another image for better explanation.
This post was edited on 7/13/23 at 2:21 pm
Posted on 7/13/23 at 5:47 pm to Meauxjeaux
Have you tried to determine when the backflow is occurring? I would put a thermometer in there on a 95 degree day and see it is closer to the air conditioned temp or the outside temp. Also see if the sir conditioner affects that temp? The clothes dryer?
Another idea may be that the hood is pulling steam from cooking and for some reason it is condensing in there. Could there be an air conditioning duct running directly above the hood in a cabinet or something like that?
I know this is all kind of random, but just trying to brainstorm.
Another idea may be that the hood is pulling steam from cooking and for some reason it is condensing in there. Could there be an air conditioning duct running directly above the hood in a cabinet or something like that?
I know this is all kind of random, but just trying to brainstorm.
Posted on 7/13/23 at 5:52 pm to Meauxjeaux
Also, I checked and I can hear a butterfly vent flaps close when turning off the fan, so there are two "check valves" in the vent run... 1- immediately after the fan and then 2- at the end of the run outside of the house.
Posted on 7/13/23 at 5:56 pm to Spankum
Ya, I little testing today I think it's only happening when the A/C system is running.
I put a piece of paper up next to fan intakes (on each side) and there is no movement when A/C is off, but it does move a little when it's on. And there is a slight feel of warm air there when it's on.
I put a piece of paper up next to fan intakes (on each side) and there is no movement when A/C is off, but it does move a little when it's on. And there is a slight feel of warm air there when it's on.
Posted on 7/13/23 at 8:56 pm to Meauxjeaux
quote:
Ya, I little testing today I think it's only happening when the A/C system is running
Well then you have got a lesk(s) on the ductwork or air intake of the central air in your attic. Get yourself some of that good quality foil duct tape and fix those leaks and I bet it will stop.
Posted on 7/13/23 at 10:15 pm to Meauxjeaux
quote:
I *think* the outside vent door has a rubber seal around it that should prevent air backflowing into it.
I would think this piece of rubber isn't giving you a full seal or as someone else said, you may not have a joint fully sealed off and will require some foil tape.
I would expect there to always at least be a little bit of moisture since that duct work is going to conduct some of that warm air from the exterior but I wouldn't expect as much as you show in that picture.
Thanks for the CAD drawings as well - easy to follow
.Posted on 7/16/23 at 9:21 am to bapple
I hadn’t thought about the pipe joints. We haven’t replaced the floor upstairs yet, so I can still pull the subfloor off and access the pipe. Going to do so and check them.
Good ideas!
Good ideas!
Posted on 7/16/23 at 1:42 pm to Meauxjeaux
Pull the exhaust fan down and put a good in line back draft damper right above the fan.
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