Before You Buy the Best Flush Mount Range Hood

A wood hood over the range, a plaster canopy, a run of cabinets with nothing showing but a clean underside: that look depends on a range hood insert. Also called a power pack or built-in liner, it is the motor, filters and lights in a steel box that mounts flush inside a custom enclosure, so the hood you see is cabinetry, not stainless steel.

Choosing one is mostly a fit-and-airflow job. This guide covers seven inserts from Broan-NuTone, Zephyr, ZLINE and Cosmo, from a 21-inch power pack that hides in a standard cabinet to a 46-inch insert for a wide range, with airflow and noise only as each maker states them.

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Quick verdict: which hood insert to buy

Below, the five standouts side by side, then all seven in full.

Five built-in hood inserts at a glance

Our five standout picks, one for each kind of custom hood. Widths, airflow and filters are as each maker or listing states them. All seven inserts are reviewed below.

Product images from Amazon. Airflow, noise and filters are as stated by each maker; check the listing and the maker’s cutout dimensions before you buy.

What a flush mount insert is, and what it is not

A finished range hood has two parts: the shell you see and the ventilation inside it. An under-cabinet or chimney hood sells both together in stainless steel. An insert sells only the working part. A cabinetmaker or contractor builds the shell from wood, plaster or metal, and the insert bolts into its underside so its bottom sits flush with the enclosure.

That gives you three practical sizes to think about. Power packs, like the 21-inch Broan-NuTone units, are small and hide in an ordinary 30 or 36-inch cabinet or hood; the cabinet itself becomes the capture area. Liner-width inserts, like the 30-inch Broan-NuTone and Cosmo, fill most of the hood’s footprint. Wide inserts, like ZLINE’s 34 and 46-inch models, are built for large custom hoods over pro-style ranges.

Almost every insert here is meant to vent outside through a duct. If your kitchen cannot run one, read our guide to the best non-vented range hood first. If you simply want a hood without building an enclosure, our main best under-cabinet range hood guide is the better starting point; none of its picks are repeated here, because they are complete hoods, not inserts. Hoods that hang on an open wall are in our best wall-mount range hood guide.

Our picks for the best flush mount range hood

These seven cover the common builds: a power pack in a standard cabinet, a liner-width insert for a 30-inch hood, inserts for 36 and 48-inch ranges, baffles at a lower airflow and a smart power pack.

How to choose a range hood insert for a custom hood

Measure the shell before you buy the insert

Every maker publishes a cutout size and a depth range. A power pack sits inside a cabinet or hood; a liner-width insert needs a shell built around its exact dimensions. Get the insert’s installation sheet to your cabinetmaker before the shell is built, not after.

Cover the cooktop

The hood shell, not the insert, sets the capture area, and it should be at least as wide as the cooktop. A 21-inch power pack works in a 30 or 36-inch hood because the shell around it holds the smoke while the fan pulls. For a 48-inch range, a wide insert like ZLINE’s 46-inch model keeps the fan close to the outer burners.

Match airflow to your stove and your code

Stated airflow here runs from 300 to 700 CFM. More is better for high-output gas burners and searing, but many local codes require make-up air once a hood passes a set airflow, often 400 CFM. Zephyr and Broan-NuTone build airflow caps into some models for this reason; ask your installer what applies where you live.

Baffle or mesh filters

Stainless baffle filters, on the Zephyr Monsoon I, ZLINE and Cosmo inserts, handle heavy grease well and go in the dishwasher. Aluminum mesh, on the Broan-NuTone PM400SS, is lighter and also washable but clogs faster in a kitchen that fries often.

Plan the duct and the noise

Duct size ranges from 6-inch round on the power packs to 8-inch round on the big inserts. A smaller duct than the maker asks for cuts airflow and adds noise, and Zephyr warns that flexible duct can restrict airflow by up to half. Check stated sones or decibels where makers give them; Broan-NuTone lists 1 sone at normal speed on the PM400SS, the quietest figure here.

How we chose these seven hood inserts

We searched for range hood inserts and power packs designed to mount inside custom cabinetry or hood shells, from makers with their own product lines: Broan-NuTone, ZLINE, Cosmo, Zephyr, Hauslane and FOTILE. Each model was checked with Amazon’s product data for stock, model number and listed features, and kept only if it was in stock, not low stock, when we wrote this. Specifications come from each maker’s listing, spec sheet or manual, with “Not stated” where the maker gives no figure. We did not install or run these inserts ourselves.

Hauslane’s inserts were out of stock or low in stock when we checked, and the FOTILE models we found are complete wall or under-cabinet hoods rather than inserts, so neither made the list. We also skipped look-alike inserts from sellers we could not identify as makers. We searched the U.S. Consumer Product Safety Commission’s recall database for each brand here and found no range hood recall. ZLINE has recalled certain gas ranges and built-in wall ovens; those recalls do not cover its range hood inserts.

Flush mount range hood questions, answered

What is the difference between an insert and a liner?

The insert, or power pack, holds the motor, filters and lights. A liner is a stainless box that lines the inside of a custom hood above the insert, protecting the wood from grease and heat. Broan-NuTone sells liners as options for its 21-inch power packs.

Can I put an insert inside a wood range hood?

Yes; that is what inserts are made for. ZLINE describes its inserts as designed for custom-built cabinetry, and Broan-NuTone’s power packs mount inside cabinets. Follow the maker’s clearance and mounting height; Broan-NuTone gives 24 to 30 inches above the cooktop for the PM400SS.

Can a range hood insert run without a duct?

Some can, with a kit. Broan-NuTone sells a non-ducted kit for the PM400SS. The Cosmo is listed as ducted only. For kitchens with no duct at all, our ductless guide covers hoods built for it.

How many CFM do I need for a gas range?

There is no single number. Higher-output burners and searing call for more airflow, while local codes may require make-up air above a set level. The inserts here run from 300 CFM for light cooking to 700 CFM for large pro-style ranges; your installer can size it to your range and your code.

Our final pick for a custom range hood

Buy the Broan-NuTone 21-inch PM400SS if you are building a hood over a standard range and want a quiet, efficient insert that one person can hang. Choose the Zephyr Monsoon I for a 36-inch hood over gas, the ZLINE 34 or 46-inch inserts for big pro-style ranges, the Cosmo for baffles at a lower airflow and the Broan-NuTone SmartSense power pack if you want the fan to run itself.

If you would rather buy a complete hood, start with our under-cabinet range hood picks. And whatever goes over your stove, you will want it running when the chiles hit a hot pan; see Mexican cooking methods explained for why charring and frying make so much smoke. When you would rather skip the cleanup, see the menu and call to order.