The best 21-inch range hood depends on whether you need a complete hood or an insert for a custom cabinet. The Broan-NuTone PM400SS is best for stronger airflow and three fan speeds; the PM300SS is a simpler 300-CFM insert; and the SmartSense model is best for automatic and voice controls. The Summit 20-inch hood and Zomagas 24-inch hood are nearby-size alternatives, not exact 21-inch replacements, so check your opening dimensions before choosing.
| Product | Listed size | Best for |
|---|---|---|
| Broan-NuTone PM400SS | 21 inches | Higher airflow and three speeds |
| Broan-NuTone PM300SS | 21 inches | Basic custom-cabinet ventilation |
| Broan-NuTone SmartSense | 21 inches | Automatic and voice controls |
| Summit HC20WW | 20 inches | Small kitchens needing a complete hood |
| Zomagas Under-Cabinet Hood | 24 inches | Buyers with a wider installation space |
Broan-NuTone PM400SS 21-Inch Insert
Best for: Buyers who want a 21-inch custom-cabinet insert with more airflow and fan-speed choices. Its three-speed blower is rated up to 450 CFM, and the product information describes a low setting of 1 sone. The insert has LED lighting and an integrated rotary control.
The included EZ1 clips are intended to simplify installation. Its stainless liner extension accommodates cabinets up to 13 inches deep; extensions for cabinets up to 15 inches deep are available. Choose this model over a 300-CFM option if the higher listed maximum airflow matters for your cooking needs.
Limitation: The product is an insert, not a complete decorative hood, and the deeper-cabinet extension is listed as an available accessory.
Broan-NuTone PM300SS 21-Inch Insert
Best for: Buyers who need a 21-inch insert with straightforward two-speed operation. The PM300SS has a blower rated at up to 300 CFM, a rocker switch, and a stainless steel liner extension for cabinets up to 13 inches deep. The listed sound level is 3 sones.
EZ1 clips are included for installation, and an ADA-compliant wall remote is available separately. This model is a more basic airflow choice than the PM400SS, which offers a higher listed maximum CFM and an additional speed.
Limitation: The wall remote is not included, and the listed maximum airflow is lower than that of the PM400SS.
Broan-NuTone SmartSense 21-Inch Insert
Best for: Buyers who want automatic fan adjustment and hands-free operation in a 21-inch insert. SmartSense adjusts fan speed based on heat from the range and includes an automatic shutoff feature. The product listing states a maximum blower capacity of 650 CFM.
Voice control is listed for Alexa and Google Assistant through Wi-Fi. This makes the model a better fit for shoppers prioritizing connected controls than for those seeking only simple manual fan settings. Its stated airflow is higher than the PM300SS and PM400SS options here.
Limitation: Smart features depend on Wi-Fi and compatible voice-control setup; confirm that the product’s installation requirements suit your cabinet.
Summit HC20WW 20-Inch Convertible Hood
Best for: Buyers with a smaller kitchen who want a complete under-cabinet hood rather than a custom insert. This 20-inch model has a white powder-coated steel finish, a two-speed fan rated at 270 CFM, and a combination aluminum mesh and charcoal filter.
Its convertible design supports ducted or recirculating ventilation. Listed duct options include 3 1/4-by-10-inch vertical or horizontal venting, or 7-inch round vertical venting with a transition. It is a practical nearby-size alternative when a 20-inch hood suits the available space.
Limitation: It is 20 inches wide, not 21 inches, so verify the opening and required coverage before selecting it.
Zomagas 24-Inch Convertible Hood
Best for: Buyers whose cabinet and cooktop area can accommodate a wider 24-inch under-cabinet hood. It offers three fan speeds, push-button controls, LED lighting, and a stated maximum airflow of 280 CFM. The listing includes two detachable aluminum mesh filters and a carbon filter.
The ducted/ductless convertible design gives buyers options for venting. Its listed dimensions are 23.43 by 19.49 by 3.94 inches, which can help when checking available space.
Limitation: At 24 inches wide, it is not a direct-size replacement for a 21-inch hood. Confirm dimensions and installation requirements first.
Buying Guide: How To Choose A 21-Inch Range Hood
Do you need a complete hood or an insert?
A custom power-pack insert fits into a compatible cabinet or hood structure; it is not the same as a complete under-cabinet hood. The Broan-NuTone PM300SS, PM400SS, and SmartSense are inserts. The Summit and Zomagas products are under-cabinet hoods. Check what your kitchen already has before comparing features.
How much airflow should you compare?
Compare the listed maximum CFM as one factor, not as a guarantee of performance in every installation. Among these picks, the SmartSense lists up to 650 CFM, the PM400SS up to 450 CFM, and the PM300SS up to 300 CFM. The Summit and Zomagas list 270 and 280 CFM, respectively. Duct layout and installation details also matter.
Will a nearby size fit?
Do not assume a 20-inch or 24-inch hood will fit a 21-inch opening. Measure the cabinet opening, hood width, depth, and available clearance, then compare those measurements with the product specifications. For inserts, confirm the required cutout and cabinet depth with the installation information.
Should you choose ducted or recirculating ventilation?
Ducted ventilation sends air outside when the home has a suitable duct route. Recirculating operation filters air and returns it to the room. The Summit and Zomagas listings describe convertible ventilation; check the product instructions and filter requirements for the configuration you plan to use.
Frequently Asked Questions
What is the best listed 21-inch range hood for higher airflow?
The Broan-NuTone SmartSense lists up to 650 CFM, while the PM400SS lists up to 450 CFM. Both are 21-inch inserts, so check cabinet fit and installation requirements.
Is a range hood insert a complete hood?
No. An insert is a ventilation unit designed for a compatible cabinet or hood structure. Confirm whether your kitchen needs an insert or a complete under-cabinet hood.
Can a 20-inch hood replace a 21-inch hood?
Not automatically. The Summit HC20WW is 20 inches wide. Measure the installation space and confirm the hood’s coverage and mounting requirements before buying.
What does convertible range hood mean?
Convertible means the hood can be configured for ducted venting or recirculating ventilation, subject to the product’s installation requirements and necessary parts or filters.