When shopping for a range hood, you’ll quickly see the term CFM.
CFM stands for cubic feet per minute, and it measures how much air a range hood can move out of your kitchen.
Choosing the right CFM is important because a hood that’s too weak won’t remove smoke, grease, and cooking odors effectively. But a hood that’s too powerful may create noise or require additional ventilation adjustments.
In this guide, we’ll explain what CFM means, how much CFM you need, and how to calculate the right ventilation power for your kitchen.
• CFM measures airflow power in a range hood.
• Gas ranges typically require higher CFM than electric cooktops.
• A common rule is 100 CFM per 10,000 BTU of cooktop power.
• Larger ranges and island cooktops require higher CFM ventilation.
• Range hoods above 400 CFM may require make-up air systems.
The right CFM depends on three main factors:
cooktop heat output (BTU)
range width
cooking style
Below are the most common guidelines.
For gas ranges, the standard guideline is:
Example:
| Total Burner BTU | Recommended CFM |
|---|---|
| 30,000 BTU | 300 CFM |
| 40,000 BTU | 400 CFM |
| 60,000 BTU | 600 CFM |
High-performance ranges with large burners may require 900–1200 CFM ventilation.
Another common rule uses the width of the cooktop.
A typical recommendation is:
Example:
| Range Size | Minimum CFM |
|---|---|
| 30-inch range | 250–300 CFM |
| 36-inch range | 350–400 CFM |
| 48-inch range | 500+ CFM |
This method works well for electric or induction cooktops.
CFM stands for cubic feet per minute, which describes how much air a range hood can move every minute.
For example:
A 400 CFM range hood can move 400 cubic feet of air per minute.
A 900 CFM hood removes more smoke and grease faster.
Higher CFM ratings mean stronger ventilation, which is especially important if you cook frequently or use a high-BTU gas range.
Yes.
Island hoods typically require more ventilation power because they lack a wall to help direct smoke upward.
Experts usually recommend adding:
+100 to +200 CFM for island installations.
Example:
| Range Size | Wall Hood | Island Hood |
|---|---|---|
| 30 inch | 300 CFM | 400–500 CFM |
| 36 inch | 400–600 CFM | 600–700 CFM |
Most residential kitchens use range hoods between:
General guideline:
| Cooking Style | Suggested CFM |
|---|---|
| Light cooking | 250–350 |
| Moderate cooking | 400–600 |
| Heavy cooking | 700–900+ |
High-heat cooking methods like frying, grilling, or wok cooking benefit from higher CFM ventilation.
A 400 CFM range hood is sufficient for many kitchens, especially if you use:
electric cooktops
small gas ranges
light to moderate cooking
However, professional gas ranges often require 600–1200 CFM ventilation.
Higher airflow is not always better.
Very powerful range hoods may:
create excess noise
require larger ductwork
trigger make-up air requirements
In many areas, building codes require a make-up air system for hoods above 400 CFM.
Make-up air replaces the air that your range hood removes from the kitchen.
Without it, powerful ventilation systems can create negative air pressure, which may affect:
HVAC performance
door pressure
gas appliance safety
If your hood exceeds 400 CFM, check local building codes to see if make-up air is required.
Yes.
Range hoods installed higher above the cooktop require stronger airflow to capture smoke effectively.
Typical installation height:
| Hood Type | Recommended Height |
|---|---|
| Under cabinet | 24–30 inches |
| Wall mount | 24–36 inches |
| Island hood | 30–36 inches |
The higher the hood sits, the more CFM you may need.
Most gas ranges require 400–600 CFM, though professional ranges may require 900 CFM or more.
Many kitchens can function with 250–300 CFM, but larger ranges or heavy cooking often require stronger ventilation.
CFM is one of the most important factors when choosing a range hood.
Understanding your cooktop’s heat output, kitchen layout, and cooking style will help you determine the right ventilation power.
Most kitchens require between 300 and 900 CFM, though larger gas ranges and island installations may need stronger airflow.
Choosing the right CFM ensures your range hood removes smoke, grease, and odors efficiently while keeping your kitchen comfortable.
CFM stands for cubic feet per minute, and it measures how much air a range hood can move out of your kitchen.
Choosing the correct hood size can be confusing if you’re not familiar with standard dimensions. In this guide, we’ll explain standard range hood sizes, how to measure for a vent hood, and how to determine the right size for your cooktop or range.
Choosing between a 30-inch and 36-inch cooktop is one of the most common decisions homeowners face when designing or upgrading a kitchen.
