Broan Range Hood Venting into Room

I need to convert a range hood that is venting both up the vertical duct and into the room, to just venting up to the duct. In the photo, the room vent is seen on top of the hood.
http://www.nutone.com/common/seriesimagehandler.ashx?id edde39-1b10-4 8f7-bacb-9600eae64e73
I have looked inside at all angles, and the squirrel cage fan is plenty strong enough to vent only up the duct. There is an assembly connected between the outlet of the fan to the top of the hood that directs some flow through the vent in the top of the hood into the room. But I don't see any way to close it - at least without taking things apart. No manual and searching the series number turned up nothing at www.broan.com.
Seems odd to me, but in any case, anyone ever seen this type of setup before?
Info from mfr plate: Broan Allur Model QS1 Rev E, Mfd 2006, 1.8A, Hi/Low 110/220 CFM
Thanks buddies!
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in message I need to convert a range hood that is venting both up the vertical duct and into the room, to just venting up to the duct. In the photo, the room vent is seen on top of the hood.
http://www.nutone.com/common/seriesimagehandler.ashx?id edde39-1b10-4 8f7-bacb-9600eae64e73
I have looked inside at all angles, and the squirrel cage fan is plenty strong enough to vent only up the duct. There is an assembly connected between the outlet of the fan to the top of the hood that directs some flow through the vent in the top of the hood into the room. But I don't see any way to close it - at least without taking things apart. No manual and searching the series number turned up nothing at www.broan.com.
Seems odd to me, but in any case, anyone ever seen this type of setup before?
Info from mfr plate: Broan Allur Model QS1 Rev E, Mfd 2006, 1.8A, Hi/Low 110/220 CFM
Thanks buddies!
PS -- The duct is well over the minimum size, clean, straight and clear all the way to the roof vent, about 8 feet. No back pressure.
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On Sun, 13 Sep 2015 19:17:15 -0700, "Snuffy \"Hub Cap\" McKinney"

I bought a new vent hood and it came set up to do up the vent and out the front. It came with a plastic insert that you put over the front exit if you wanted it to go up the roof vent. As this was an existing house with a roof vent I hooked it to the vent tube and installed the plastic cover. I could still feel air coming out thru the plastic cover area. I suspect you are missing whatever sort of cover it came with originally to cover up the inside vent area OR it's already installed and just leaks some air like mine did. How strong is the air flow out the inside part? I just left mine with the leakage since it's in a rental. If it had been in my house I'd have figured how to put metal duct tape over it on the inside to really seal it up.
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message I need to convert a range hood that is venting both up the vertical duct and into the room, to just venting up to the duct. In the photo, the room vent is seen on top of the hood.
http://www.nutone.com/common/seriesimagehandler.ashx?id edde39-1b10-48f7-bacb-9600eae64e73
I have looked inside at all angles, and the squirrel cage fan is plenty strong enough to vent only up the duct. There is an assembly connected between the outlet of the fan to the top of the hood that directs some flow through the vent in the top of the hood into the room. But I don't see any way to close it - at least without taking things apart. No manual and searching the series number turned up nothing at www.broan.com.
Seems odd to me, but in any case, anyone ever seen this type of setup before?
Info from mfr plate: Broan Allur Model QS1 Rev E, Mfd 2006, 1.8A, Hi/Low 110/220 CFM
Thanks buddies!
---------------
http://www.broan.com/common/productDigitalAssethandler.ashx?id )120b3d-2c79-4ca6-8e8f-146a1bd37777
This is a link to one of their installation manuals, for one of their hoods which can be EITHER ducted or non-ducted. It looks like whoever installed didn't skip the steps pertaining to non-ducted installation AND did the steps pertaining to ducted installastion to boot.
With any luck you can get in there and slide the recircultion slide plate back in the closed position.
Good luck!
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8f7-bacb-9600eae64e73

-2c79-4ca6-8e8f-146a1bd37777

Thanks AC & TS. I checked it out and that's exactly what happened. I can see something halfway diverting the exhaust out into the room. I bought it and the cabinet contractor installed it. Big mistake not reading the instructions first. The duct was already there from previous hood. Evidently people don't read the instructions.
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Metal duct tape is your friend.
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Yep, I always keep it handy. Still need to know if there's a plate blocking something before jumping into this. I'm hoping to get the manual or drawing from the Broan folks tomorrow.
Here's a poor sketch of the fan. Fan has a cylinder fastened to it and both turn together. The cylinder has a lip at the bottom that directs some of the exhaust away from the fan inlet and back out toward the range top. I put some metal tape around the housing which directs it back into the fan. Mickey Mouse I know, but it works in keeping the exhaust from spilling back outside the duct.
http://i58.tinypic.com/2588512.gif
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Broan Allur Model QS1 Rev E, Mfd 2006, 1.8A, Hi/Low 110/220 CFM Found the manual for this unit online... Page 3 shows the steps that were skipped during installtion....
http://www.homedepot.com/catalog/pdfImages/4d/4d54a7fe-0045-47cf-a609-766 d0924c77a.pdf
in message I need to convert a range hood that is venting both up the vertical duct and into the room, to just venting up to the duct. In the photo, the room vent is seen on top of the hood.
http://www.nutone.com/common/seriesimagehandler.ashx?id edde39-1b10-4 8f7-bacb-9600eae64e73
I have looked inside at all angles, and the squirrel cage fan is plenty strong enough to vent only up the duct. There is an assembly connected between the outlet of the fan to the top of the hood that directs some flow through the vent in the top of the hood into the room. But I don't see any way to close it - at least without taking things apart. No manual and searching the series number turned up nothing at www.broan.com.
Seems odd to me, but in any case, anyone ever seen this type of setup before?
Info from mfr plate: Broan Allur Model QS1 Rev E, Mfd 2006, 1.8A, Hi/Low 110/220 CFM
Thanks buddies!
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message Broan Allur Model QS1 Rev E, Mfd 2006, 1.8A, Hi/Low 110/220 CFM Found the manual for this unit online... Page 3 shows the steps that were skipped during installtion....
http://www.homedepot.com/catalog/pdfImages/4d/4d54a7fe-0045-47cf-a609-766d0924c77a.pdf
----------
Isn't it page 4 that shows the steps that WERE NOT skipped (but should have been)?
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er, you are right.
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in message I need to convert a range hood that is venting both up the vertical duct and into the room, to just venting up to the duct. In the photo, the room vent is seen on top of the hood.
http://www.nutone.com/common/seriesimagehandler.ashx?id edde39-1b10-4 8f7-bacb-9600eae64e73
I have looked inside at all angles, and the squirrel cage fan is plenty strong enough to vent only up the duct. There is an assembly connected between the outlet of the fan to the top of the hood that directs some flow through the vent in the top of the hood into the room. But I don't see any way to close it - at least without taking things apart. No manual and searching the series number turned up nothing at www.broan.com.
Seems odd to me, but in any case, anyone ever seen this type of setup before?
Info from mfr plate: Broan Allur Model QS1 Rev E, Mfd 2006, 1.8A, Hi/Low 110/220 CFM
Thanks buddies!
== I just got around to fixing this hood. After getting the manual, it was 5 screws to remove the access panel holding the lights and one screw to remove the "air chute" (exhaust diverter). Inside the diverter the baffle had been inserted to blow air out into the room thru a vent in the top of the hood. It was simple to pull the baffle piece out, flip in around and keep the exhaust inside the duct.
I thought about just putting a piece of sheet metal over the opening in the duct, but didn't want to spend the time if it worked.
Reassembled and there is still a slight flow out of the vent into the room, and also some air flowing out around the lights, although both are lower than before. Still I don't want ANY exhaust coming out in the room. That defeats the whole purpose of having a vent fan.
I strated looking at where the air was coming from. The fan is fixed to a rotating housing, and the housing has a lip -- hard to describe -- on the bottom. So that when the exhaust starts to back up, it can flow back around the outside of the fan housing and down toward the stove top. The way the lip is curved, it forces the back pressure out away from the fan blade and it comes out back down thru the filters and toward the stove top. It also flows up and out the openings for the lights.
I looked up thru the fan and it looks pretty clear all the way to the top.
Now I'm starting to get pissed. Seems to me the outlet of the van should be sealed so that any back pressure will not come back down into the kitchen. If that's a safety issue, they could have put a spring loaded relief vent instead of leaving that path completely clear.
I know there is always going to be exh leaking back around the blades, but I think this might be a bad design in this case.
Any comments about this?
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in message I need to convert a range hood that is venting both up the vertical duct and into the room, to just venting up to the duct. In the photo, the room vent is seen on top of the hood.
http://www.nutone.com/common/seriesimagehandler.ashx?id edde39-1b10-4 8f7-bacb-9600eae64e73
I have looked inside at all angles, and the squirrel cage fan is plenty strong enough to vent only up the duct. There is an assembly connected between the outlet of the fan to the top of the hood that directs some flow through the vent in the top of the hood into the room. But I don't see any way to close it - at least without taking things apart. No manual and searching the series number turned up nothing at www.broan.com.
Seems odd to me, but in any case, anyone ever seen this type of setup before?
Info from mfr plate: Broan Allur Model QS1 Rev E, Mfd 2006, 1.8A, Hi/Low 110/220 CFM
Thanks buddies!
== I just got around to fixing this hood. After getting the manual, it was 5 screws to remove the access panel holding the lights and one screw to remove the "air chute" (exhaust diverter). Inside the diverter the baffle had been inserted to blow air out into the room thru a vent in the top of the hood. It was simple to pull the baffle piece out, flip in around and keep the exhaust inside the duct.
I thought about just putting a piece of sheet metal over the opening in the duct, but didn't want to spend the time if it worked.
Reassembled and there is still a slight flow out of the vent into the room, and also some air flowing out around the lights, although both are lower than before. Still I don't want ANY exhaust coming out in the room. That defeats the whole purpose of having a vent fan.
I strated looking at where the air was coming from. The fan is fixed to a rotating housing, and the housing has a lip -- hard to describe -- on the bottom. So that when the exhaust starts to back up, it can flow back around the outside of the fan housing and down toward the stove top. The way the lip is curved, it forces the back pressure out away from the fan blade and it comes out back down thru the filters and toward the stove top. It also flows up and out the openings for the lights.
I looked up thru the fan and it looks pretty clear all the way to the top.
Now I'm starting to get pissed. Seems to me the outlet of the van should be sealed so that any back pressure will not come back down into the kitchen. If that's a safety issue, they could have put a spring loaded relief vent instead of leaving that path completely clear.
I know there is always going to be exh leaking back around the blades, but I think this might be a bad design in this case.
Any comments about this?
****
The other comment is that instead of the lip on that fan housing being outward, if it were straight, any back pressure exhaust would flow straight down and be pulled back into the fan.
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