Shops over 200 square meters should be equipped with 5.5KW exhaust fans. 200*3.8* 15 fans are required for the exhaust of 200m2. If the standard room is 3.8 meters high, and if it is a restaurant kitchen, press 15 times, that is 200 * 3.8 *15 =11400 fan, which is about 5.5KW.