Compared to non-adjustable models, a vent hood with an adjustable blower can save money and overhead noise. Tweaking the fan speed means tweaking the airflow, and that means less CFM — or, in this case, much more appropriate CFM. Logic follows that using only what you need costs less overall. An adjustable blower lets you turn down your vent hood to match cooking temperatures with cooking quantity (and there’s your formula for smoke). With non-adjustable blowers, that vent hood blower is either “on” or “off” — even if you’re flipping 2 burgers and the bare minimum of a single kebab.