Range hood size covers its width, depth and mounting height, while airflow describes how much air it can move, usually listed as cubic feet per minute. Both numbers should suit your cooktop and your cooking habits, and neither means much without the other.
Reading Size
Width is the first number most people check. Hoods commonly come in widths that match standard stove and cooktop sizes, and many people choose the same width or a little wider. Depth matters because the hood must extend over the front burners. Height refers to the clearance between the cooking surface and the hood, which the maker specifies in the installation guide.
Reading Airflow
Airflow is often shown as CFM, meaning cubic feet per minute. A higher figure means the fan can move more air at its top speed. Real results also depend on the duct run, the number of bends, the distance to the outside and how well the hood captures what rises.
- CFM
- A measure of how much air moves in a minute.
- Sone
- A measure of loudness, where lower generally means quieter.
- Capture area
- The part of the hood that catches rising steam and grease.
- Duct size
- The diameter of the pipe that carries air out.
Matching Numbers to Cooking
| Cooking style | What to consider |
|---|---|
| Light simmering and baking | A modest fan and standard width may be enough |
| Frequent frying and searing | Look for stronger capture and a generous width |
| High-output gas ranges | Check the maker’s guidance on ventilation needs |
| Open-plan living areas | Pay close attention to noise at higher speeds |
Common Mistakes
- Choosing by airflow alone and ignoring noise.
- Forgetting that long, bending ducts reduce performance.
- Selecting a hood narrower than the cooktop.
- Mounting at a height that differs from the maker’s instructions.
A Short Worked Example
Suppose you have a cooktop of a certain width. Begin by noting the width, then look for hood widths that match or exceed it. Next, find the maker’s mounting height range and confirm it fits under your cabinets or ceiling. Then compare the airflow figure and noise level at different speeds. Finally, sketch the duct path from the hood to the outside and count the bends. Each step narrows the options until one or two models make sense for your kitchen.
If you are unsure, bring your cooktop dimensions and a sketch of your ceiling height and duct path when you talk with a licensed professional. They can describe how the pieces fit together in your home and what the maker requires.
FAQ
Is more CFM always better?
Not necessarily. A very strong fan can be loud and may need extra planning for makeup air. Choose an airflow that suits your cooktop and the duct you have.
Who should check the venting plan?
Follow the maker’s instructions and use a licensed professional for ducting, electrical work and anything involving gas appliances.
The Short Version
Size tells you coverage and airflow tells you air movement. Choose both in light of your stove, your duct run and how you cook, and leave installation to a licensed professional.