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Old 03-13-2012, 08:53 PM   #46
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Venting an oven range microwave


As Danny said in one of the first responses, check the installation instructions on the microwave. Do you NEED any venting at all?
If the vent you have planned is rated at 300 cfm and says you need a 3-1/4 x 10 duct, and you put it through a 4" dia duct, well then, you won't get 300 cfm of airflow. Hardly the end of the world, unless there is some requirement for airflow to keep temperatures down.

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Old 03-13-2012, 09:55 PM   #47
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Venting an oven range microwave


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Originally Posted by SPS-1 View Post
As Danny said in one of the first responses, check the installation instructions on the microwave. Do you NEED any venting at all?
If the vent you have planned is rated at 300 cfm and says you need a 3-1/4 x 10 duct, and you put it through a 4" dia duct, well then, you won't get 300 cfm of airflow. Hardly the end of the world, unless there is some requirement for airflow to keep temperatures down.
Thanks for the help. At this point the work has been done so there's no turning back really. I haven't actually bought the microwave either, but now I have the comfort of knowing that I can get that 300cfm without having to worry!
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Old 03-14-2012, 06:15 AM   #48
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Venting an oven range microwave


Thought I was done commenting on this however I just realized something.
You didn't even have the microwave or the installation instructions before you started this task.
I think maybe some of the responses would have been different.

The cart was before the horse, here's a potential problem you may encounter when installing the microwave.

Exhaust from microwave not lining up with hole in the wall and duct connection.
You should have had the microwave and the "Template" to get the exact location of the exhaust before starting the hole.

Oh well just an afterthought hope everything lines up properly for you.

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