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Slowing blowers on a chiller coils allows the air to be colder and remove more moisture. Slow the air flow to minimum necessary to cool the space, reduce fresh air to minimal amount acceptable, and set the chiller temperature as low as possible. These are the easy things. Most consider 20 cfm of fresh air as the minimum for smoking/15 cfm for nonsmoking.
If your stove sits against a wall, you should provide 100 CFM of airflow per linear foot of range. For example, a 24 inch (60 cm) range would require a hood rated at 200 CFM or greater. If your stove is on an island, you should provide 150 CFM of ventilation per foot of your stove's length. So, a 24 inch (60 cm) range on an island needs 300 CFM of airflow. 3. Determine the recommended ventilation based on your kitchen's size. The HVI also recommends that your range hood should be capable of cycling the air in your kitchen completely 15 times per hour.