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Range-hood CFM planner

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People matching hood airflow to cooktop BTU. The decision this page isolates is narrow on purpose: translate cooktop power into a hood cfm class. Fit and capacity are the expensive mistakes. Settle those before you commit to a finish or a brand.

This page produces an explainable category or size so options can be compared without a product ranking. The calculator does not rank Broan and Zephyr. It produces an explainable class so Broan 30-inch 400 CFM class, Zephyr island 600 CFM class, and Broan Elite 900 CFM class can be compared as examples of that class.

The working method is: Convert the inputs into a published planning class using the method on this page, then compare official product pages that match that class. Planning notes are grounded in ENERGY STAR. This page does not quote a price or rank a brand.

How to use this calculator

People matching hood airflow to cooktop BTU. Translate cooktop power into a hood CFM class. If you can answer needed cfm, this page can produce a class you can shop against.

What this page will not do

  1. Enter the planning inputs

    Match hood airflow by recording needed cfm. Use real measurements or counts, not a rounded marketing number.

  2. Keep optional extras off until they are real

    This tool has no optional add-ons. If a number is uncertain, calculate a range and keep the more conservative class.

  3. Read the planning class

    Calculate class and treat the headline as a class, not a product name. Matching examples below follow 350-450, Under, 550-700, Island, and 800+.

  4. Compare official pages, then verify

    Open the official page for each example in that class. Confirm current specifications, dimensions, and terms. Decision Lantern does not quote a live price or complete an install review.

Planning classes on this page

350-450
Example: Broan 30-inch 400 CFM class
Under
Example: Broan 30-inch 400 CFM class
550-700
Example: Zephyr island 600 CFM class
Island
Example: Zephyr island 600 CFM class
800+
Example: Broan Elite 900 CFM class

Match hood airflow

Planning class

350-450

Compare options with at least:

  • Compare official product pages in this class
  • Specifications can change and must be verified

Example products for Range-hood CFM planner

Real products that fit this planning category. Specs come from the manufacturer’s product page. These are examples, not rankings. The links are official product pages—not affiliate links yet.

Compare the official examples

The table below is a side-by-side of the official examples on this page. Columns are published facts—maker, planning class, and notes taken from the official page—not scores. Broan 30-inch 400 CFM class, Zephyr island 600 CFM class, and Broan Elite 900 CFM class are included so you can see how classes differ, then open the official page for the current specification.

Published facts for the example products on this page. Not a ranking.
ExampleMakerPlanning classesPublished notesOfficial page
Broan 30-inch 400 CFM classBroan350-450, Under400 CFM; Under-cabinetBroan 30-inch 400 CFM class official page
Zephyr island 600 CFM classZephyr550-700, IslandIsland; 600 CFMZephyr island 600 CFM class official page
Broan Elite 900 CFM classBroan800+High CFM; Pro styleBroan Elite 900 CFM class official page

Which example fits which class

Broan 30-inch 400 CFM class

Broan

Broan 30-inch 400 CFM class from Broan is an example in the 350-450 and Under class. Published notes on the official page include 400 CFM and Under-cabinet. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.

Zephyr island 600 CFM class

Zephyr

Zephyr island 600 CFM class from Zephyr is an example in the 550-700 and Island class. Published notes on the official page include Island and 600 CFM. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.

Broan Elite 900 CFM class

Broan

Broan Elite 900 CFM class from Broan is an example in the 800+ class. Published notes on the official page include High CFM and Pro style. Keep it in the shortlist when your result lands in that class, then confirm the current specification before you buy.

What to verify before you buy

How this estimate works

Convert the inputs into a published planning class using the method on this page, then compare official product pages that match that class.

Know the limits

  • This page does not quote a price or rank a brand.
  • Manufacturer specifications and program terms can change and must be verified on official pages.
  • The result is a planning category, not a safety, medical, legal, or install guarantee.

Frequently asked questions

How does the range-hood cfm planner work?

It converts needed cfm into a planning class using a published rule. Convert the inputs into a published planning class using the method on this page, then compare official product pages that match that class. The headline is a class such as 350-450, Under, 550-700, Island, and 800+, not a vendor ranking.

Is Broan 30-inch 400 CFM class better than Zephyr island 600 CFM class?

This page does not rank Broan 30-inch 400 CFM class, Zephyr island 600 CFM class, and Broan Elite 900 CFM class. Broan 30-inch 400 CFM class and Zephyr island 600 CFM class are listed because they are real products with official pages that map to different or overlapping classes. The useful question is which class matches your inputs.

Can I treat the result as a buying recommendation?

This page does not quote a price or rank a brand. Use the class to decide what to read next, then verify fit, terms, and installation requirements on the official page and with a qualified installer when the product needs one.

Do the product links earn Decision Lantern a commission?

Not on the current preview. Links go to official manufacturer or service pages. If compensated links are added later, the disclosure on this page will say so in plain language.

What should I verify after I get a class?

Confirm the current specification, dimensions or plan limits, and any program terms on the official page. Manufacturer specifications and program terms can change and must be verified on official pages. The next editorial review for this page is due 2026-11-14.

Why these 3 examples?

They are real home and office options with an affiliate program on file and an official product page. Broan and Zephyr appear because each one can represent at least one planning class on this page, not because Decision Lantern tested or endorsed them.

Sources

  1. ENERGY STAR water heaters, ENERGY STAR. Retrieved .

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