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Aim for 100 CFM per linear foot of cooktop width.

Because they face cross-drafts, they should always be wider than the cooktop (extend 3–6" beyond the range). 3. Calculate Required Power (CFM) Power is measured in CFM (Cubic Feet per Minute) or buy kitchen hood

To capture all fumes, your hood must be at least as wide as your cooktop. A 30" cooktop needs at least a 30" hood. Aim for 100 CFM per linear foot of cooktop width