Microwaves cannot be ducted into a common duct work. DO NOT vent into an attic or crawl space.
There is no requirement that your Over The Range (OTR) Microwave be vented to the outdoors. All OTR microwave ovens can be set up to either allow the fan to recirculate the air back into the kitchen or be vented to the outdoors.
No, you should never vent your range hood into the attic. The excess buildup of grease and moisture in your attic will ruin it and over time may cause mold damage. Instead, vent your hood through an interior wall or through the ceiling all the way outside of your home.
Most modern microwaves use recirculatory venting and don't have to be vented. However, if you have either a microwave above the range or want to keep food smell to a minimum, you might want to vent your microwave. Venting microwaves on an interior wall normally means installing a ventilation pipe.
A recirculating venting microwave, or ductless range hood, is a built-in ventilation system that recycles air through the microwave vents. The recirculating ventilation pulls the air through charcoal filters or other types of filters.
If the microwave vents out of the house, this will be hooked up before the microwave is slid into the brackets. If a vent installation is required, you can expect to pay anywhere between $150 and $500, depending on the complexity of the project.
Venting To The Outside:
If you are going to vent your microwave oven to the outside you will need to install an exhaust duct with a vent hood. Most hood exhausts has been designed to mate with standard 3 1⁄4′′x 10′′rectangular duct. If a round duct is required, a rectangular-to-round transition adapter must be used.
When your microwave is in a cabinet, you'll still need a place to plug it in for it to work. If there is a power outlet in the back of your cabinet, you can plug it in there; otherwise, you'll need to cut a small hole in the side of your cabinet to pass the plug through and plug it in at the nearest power outlet.
Range hoods do not have to be vented to the outside. You can purchase hoods without ductwork called ductless hoods. But, ducted range hoods are almost always preferred over ductless hoods.
You must not vent into the soffits, or even under the soffits unless you are more than a foot and a half below the soffit to allow the wind to dissipate the moisture before it rises back up into the attic.
In many cases there are visible vents at the top of the microwave face frame, or a top panel that opens as a flap when the exhaust fan of the microwave is activated. In either example, the cooking by-products are filtered through the filter medium, which is important.
It depends on the model or manufacturer. Nevertheless, a minimum of three inches of space on all sides of the oven will provide enough clearance. Leave three inches of space between the walls and the top, sides, and rear of the microwave oven.
In doing this, consider the position of your microwave blower so the air it blows will be directed to the vent. Get your driller and start drilling to position the templates. Install the mounting bracket of your microwave to the wall by drilling the holes. Gently lift the microwave for the next step.
An externally vented microwave uses a fan to draw air through the microwave's vents and into an exhaust duct leading to the exterior of the building, which means that most of the moisture, heat, odor and particulate matter generated by cooking goes directly outside.
Unlike countertop models, OTR microwaves are not portable, and they boast a higher price tag: However, they also have built in exhaust fans, which serve as a stove-top ventilation system to eliminate smoke, steam, and cooking odors.
Typically, the external exhaust vent of your OTR microwave is located on top of it. It vents out to the roof. It also appears to come out of the top at the front of the device if you're venting back into the room via the recirculating ventilation system.
Convertible means it can vent through the wall or ceiling using a duct, or can be converted to non-venting (filters the air and blows it back into the kitchen) with Recirculation Kit Part Number W10294733 which is available from your dealer or an authorized parts distributor.
You can vent a dryer through the soffit area as long as its exhaust vent is at least 3 feet away from any intake vents and it is capped properly to prevent any rodents from getting in.
To clear out any confusion, soffit is the underside area of the roof overhang or eave. It is possible to vent your bathroom fan through the soffit and avoid making a hole in the roof. Usually, a hole in the roof may lead to leaks and other problems.
Whether it's new construction or a remodel, a bathroom vent should always vent through the roof instead of an eave, overhang, or soffit. The point of a bathroom exhaust vent, or any vent really, is to remove hot, moist air from the house.
The best option is to vent vertically through the roof if possible, since hot air rises. But this is not required. Vent through a side wall if you cannot vent directly above your hood. To have a smooth installation, find a great contractor to install your ductwork.