Science of Suction: Understanding CFM Ratings for Range Hoods

By Arnie Hauslane Expert

2 mins read | Last updated 03/30/2025

When it comes to choosing the right range hood for your kitchen, one term you’ll encounter often is CFM. But what does it mean, and why does it matter? Let’s break it down so you can make an informed decision and keep your kitchen fresh, clean, and odor-free.

the Hauslane UC-PS18 range hood sucking up smoke

How Much CFM Do You Need?

Choosing the right CFM depends on a few factors:

1. Your Cooking Style

Light Cooking: If you rarely fry or cook with strong aromas, a range hood with 150–300 CFM should suffice.
Heavy Cooking: If you use a gas stovetop, do a lot of frying, or cook multiple meals a day, opt for 400+ CFM.

2. Your Stove’s Heat Output

For gas ranges, calculate your required CFM by multiplying the total BTU (British Thermal Unit) output of your stovetop by 0.01. For example, a stovetop with 40,000 BTUs would need a range hood with at least 400 CFM.

3. Your Kitchen Size

In larger kitchens, you’ll need more airflow to keep the space ventilated. A general rule is to provide 100 CFM for every 12 inches of stove width. For example, a 36-inch stove would require at least 300 CFM.

Why CFM Matters

The right CFM ensures your range hood does its job effectively. If your hood’s suction power is too weak, you’ll be left with lingering smells, grease buildup, and poor air quality. On the other hand, too much suction can create unnecessary noise and energy usage.

Finding the Right Balance

It’s not just about power—it’s about matching the CFM to your kitchen’s specific needs. Here are a few tips:

Consider Noise Levels: Higher CFMs often mean more noise. Look for models with sound-dampening features if quiet operation is a priority.
Check Your Ductwork: Ducted range hoods typically perform better at high CFMs than ductless ones, but they need properly sized ducts for optimal performance.

Ready to Upgrade Your Kitchen Ventilation?

Investing in the right range hood with the ideal CFM can transform your cooking experience—and your home’s air quality. Whether you’re an occasional cook or a culinary enthusiast, understanding CFM is the first step toward finding your perfect match.