To power your range hood, you need at least 100 CFM for every 10,000 BTUs of your stovetop 👍 For example, a 100,000 BTU stove needs at least a 1000 CFM range hood 😁 For electric stoves, multiply the stove width by 10 😁 So, for a 42” electric stove you want a range hood with at least 420 CFM.To vent cooking exhaust from your kitchen efficiently, we recommend a range hood with at least 600 CFM.Keep in mind that there is no ideal range hood CFM is not the right term. Instead, choose the CFM that suits your style of cooking and other kitchen habits. Every person will have a different choice of range hood. This depends on the style of your cooking and your stovetop. 
When it comes to range hoods, it’s ability must be compatible with the exhaust generation rate of your cooking range and the type of food you cook. If you cook on high settings and if you’re cooking food with a lot of emissions, you will need a relatively powerful range hoodYour minimum requirement is met. The range hood’s performance will be enhanced if the ducting is correct in size. The range hood won’t perform to its full potential if it has poor ducting. Based on how long the duct is and what bends it has, the efficiency of the range-hood will be further reduced. Zackariah Peterson, for sharing this information with us. 
Bestreviewpros.com It is also important to note that it may be hard to determine how much CFM you actually need when purchasing a range hood. CFM is cubic feet per minute. This refers to how much air the range hood can move in a certain amount of time. CFM happens to be the way most range hoods are measured, and this is important, because this is how quickly the hood will move the poor quality air from your kitchen when you’re cooking. In an effort to make a “Range Hood CFM Calculator” of sorts, we’ll cover some of the major factors that contribute To meet your airflow needs. Modified December 6, 2021 by Donnita Florandes 
Additional information available at hoodfilters.com This also illustrates the importance of knowing the amount of ductwork between the fan and the fan when determining the correct CFM. The more duct work between your fan and the hood, the better. Air has to travelThere are more chances for airflow to slow down, so the higher the value of your hood. Air flow rates will drop from your fan to your hood because of frictional or turbulence loss. Your duct shape (square or round) can also impact your CFM. It’s also important to consider how many turns and twists it will need. (last updated 95 days ago by Lilly Emery, Barcelona Puerto La Cruz Venezuela).