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Old 01-08-2011, 06:06 PM   #16
mem
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Microwave roof venting

handy man88, is your vent cap mounted on a sidewall? Probably looks much better there than R2D2 on the roof keeping watch!

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Old 01-09-2011, 02:48 AM   #17
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Microwave roof venting

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handy man88, is your vent cap mounted on a sidewall? Probably looks much better there than R2D2 on the roof keeping watch!
Actually, it's on my roof.

The set up on the roof looks like a periscope from a submarine.
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Old 01-09-2011, 08:17 AM   #18
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Microwave roof venting

Sorry, no offense intended. Just my lame attempt at humor, juvenile as it may be.
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Old 10-10-2011, 06:28 PM   #19
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Microwave roof venting

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The biggest culprit is likely the damper in the huge, ugly cap. As soon as you turn the fan off, the flapper closes and all the hot moist air is trapped inside the duct and cap. As the air cools the moisture condenses and falls back inside the microwave. My microwave/hood combination has a damper as well, but it is located at the microwave, allowing the warm air to continue to rise naturally when the fan is turned off.
I'm not understanding this statement.

The installation instructions for microwaves state that a damper be installed at the roof vent. That would be code in my area (we follow IRC), as appliance instructions determine what would be considered to be installed to code.

I was just looking at a microwave kit at Home Depot and it included a large dampered roof vent.

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