600 CFM is the best OTR microwaves around due to their high velocity at which it's able to move air. The highest rating you will normally find with an OTR microwave is 200 CFM to 400 CFM. You can go all the way to 600 CFM though.
Two of the most common airflow ratings for microwave ovens are 300 CFM and 400 CFM. If you are faced with the decision to purchase a 300 or 400 CFM microwave, go with 400 CFM.
CFM stands for cubic feet per minute, which means that a 600 CFM microwave is able to exhaust 600 cubic feet of air per minute, on average. These high CFM models offer maximum air flow for superior ventilation.
Duct Installation Guidelines: All over-the-range microwaves can be vented to the outside using an equivalent total of 140 feet of rigid 3 1/4" x 10" rectangular or rigid 6" round ducting.
Countertop Models: 3" of clearance on both sides and the top. 1" clearance in the rear. The front edge of the microwave (measured at door) should sit at least 3" or more back on the counter or shelf to avoid accidental tipping.
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.
Adequate ventilation, especially if the microwave is built into a wall of cabinetry, is a must.
CFM is how many cubic feet of air the range hood exhausts every minute at full speed. Simply put, the higher the CFM, the more air the hood vents out of your kitchen. To power your range hood, you need at least 100 CFM for every 10,000 BTUs of your stovetop.
No. Avoid flexible duct for your range hood, regardless of the CFM. Flexible duct is a poor investment because it is: Not durable/sturdy.
All current over the range microwaves and Advantium ovens can be installed over gas cooking products up to and including 5 burner stoves. As long as the 66" minimum from the floor to the top of the unit is followed there will be no performance or warranty concerns.
600 CFM is the best OTR microwaves around due to their high velocity at which it's able to move air. The highest rating you will normally find with an OTR microwave is 200 CFM to 400 CFM. You can go all the way to 600 CFM though.
For high-output gas ranges or cooktops, the minimum rate of 1 CFM of ventilation per 100 British thermal units (BTU) is recommended. For example, if your high-output burner output is 45,000 BTU, look for a range hood that provides 450 CFM to best clear the air. However, the higher the CFM, the louder the hood will be.
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.
Range hoods whisk away fumes and keep your kitchen clean from grease. Microwaves help to thaw and warm up food. Over the range (OTR) microwaves with exhaust fans try to bring these two functions together into one appliance.
While over-the-range microwaves have been stylish for years, the trend is on the way out in 2018.
Reviewing the chart, a 4” pipe will convey 395 CFM at 4500 FPM. This means that a 4” pick-up on a machine will use 395 CFM from the filtering system; or, if you know that a machine will require approximately 400 CFM to remove the waste, you should use a 4” pipe for that purpose.
Exception: Ducts for domestic kitchen cooking appliances equipped with down-draft exhaust systems shall be permitted to be constructed of schedule 40 PVC pipe and fittings provided that the installation complies with all of the following: The duct is installed under a concrete slab poured on grade.
Rigid duct is without a doubt the best option for venting your range hood. Rigid duct is higher quality than flex duct and is made of much more durable materials. For more information on choosing the right type of duct for your range hood, check out this article.
To calculate the CFM for a gas stove, add the BTU ratings for all burners. Typically, 5,000 to 15,000 per burner is common, and a standard size four-burner stove will be about 40,000 BTU total. Divide your total by 100 to figure the CFM you need.
The air movement or power for range hoods is measured in cubic feet per minute (CFM). Commercial kitchens or households that do a lot of heavy cooking need to get a range hood with at least 350 CFM. This amount of power is enough to pull out excess steam and strong odors from the kitchen.
For gas cooking surfaces or range, a minimum ventilation level of 100 CFM (Cubic Feet per Minute) per 10,000 BTU is recommended. However, the hood must have a minimum of 500 CFM of ventilation power.
Examine the countertop microwave to locate all vents on the two sides, top and back panels. Since a countertop microwave is designed to rest on a countertop, the vents are often placed on the sides or top to ensure the vents have proper air space to clean out dust and expel hot air during operation.
Over-the-range microwave ovens have built-in ventilation systems with internal exhaust fans. These fans protect the microwave oven from overheating by routing the heat which is produced. The ventilation system may connect to an exterior vent or recirculate the heat back into the kitchen.
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.
They do a better job of extracting toxins and smoke (although not at the same level as a range hood). A vented option will remove these fumes and vent them to the exterior of your home. A recirculating OTR microwave uses charcoal filters to neutralize air before it is pumped back into your kitchen.