You need roughly 100 CFM for every 10,000 BTUs of your stove's total output.
For general effectiveness, multiply your kitchen's volume (Width x Depth x Height) by 10 to find the minimum extraction rate needed per hour. Which Cooker Hood? Buying Guide - Bosch buy kitchen hood
These use charcoal filters to clean the air before blowing it back into the kitchen. They are easier to install but less effective at removing heat and steam. 2. Determine the Right Size You need roughly 100 CFM for every 10,000
Aim for 100 CFM per linear foot of cooktop width. buy kitchen hood