Venting A Microwave Into The Attic

Both smaller and larger vents than recommended decrease venting performance.

Venting a microwave into the attic.

The ventilation system may lead to an exterior vent or it may simply recirculate air back into the kitchen. First we do not have all the facts. If you re tempted to vent your exhaust fan through an existing roof vent or even vent it into the attic don t do it. I would like to use that path to vent a new microwave.

Microwave oven vent installation suggestions. Do not vent into an attic or crawl space. No other questions need be asked answered to determine that it is improper to vent the range hood into the attic. Ideally the range hood should be vented to the outside usually through the roof.

Anyway i went into the attic and saw a nice vent line going from over the microwave up to but not out of the roof. Microwaves cannot be ducted into a common duct work. She said the vent was in the attic and again she was right. A microwave oven designed to be mounted over a cooktop is usually equipped with a ventilation system to cope with the cooking odors smoke and moisture that rise from the cooking surface.

The old microwave did not. A rectangular to round transition adapter must be used. It appears when this house was built provision was made for venting out the rear of the microwave into the standard 2 4 wall up the cavity inside the wall then up through duct work in the attic through the roof. I want to vent to the outside.

The duct must be the sizes listed above for proper draw of air. First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic. This article describes the venting options for built in microwave ovens and microwave oven vent systems typically installed above a stovetop or range. If round ducting also note the following.

Second during cold winters you ll be blowing warm moist air onto a cold surface the roof vent and roof plywood. Mstankiewicz marc stankiewicz july 10 2011 12 06am 8. International mechanical code imc 2009. From where i viewed did not see any inside openings on the vent plimbing although i did not climb over to the vent and look on the backside.

Chapter 5 section 505 1 exception 1.