Range Hoods: 600 CFM vs. 1200 CFM

Why most homes are dramatically under-ventilated — and what your range hood actually needs to do for a 36" pro range.

7 min read · Updated May 2026 · By Daniel Caro, Construction Manager

The range hood is one of the most under-specified appliances in residential construction. Builder-grade hoods are 300–400 CFM, which is barely adequate for a 30" standard range. Above a 36" or 48" pro-style range (Wolf, Viking, BlueStar), 300 CFM is laughably insufficient. The kitchen ends up smelling like last week's dinner and your art a year later. Here's what your range hood actually needs to do.

What CFM means and what you need

CFM (cubic feet per minute) is the air-moving capacity of the hood at maximum speed. The rule of thumb for residential cooking is 100 CFM per linear foot of cooking surface. So:

30" range: 300 CFM minimum
36" range: 360 CFM minimum
48" range: 480 CFM minimum
60" range: 600 CFM minimum

These are minimums. For pro-style ranges with 20,000+ BTU burners, you need more — usually 1.5–2x the minimum. For grills, woks, or heavy-duty cooking, more still.

Pro-style range manufacturers publish recommendations:

Wolf 36" dual-fuel: 600–900 CFM
Wolf 48" dual-fuel: 900–1200 CFM
Viking 36": 600–1000 CFM
BlueStar 36" (25,000 BTU burners): 1000–1500 CFM

Why most homes are under-ventilated

Builder hoods (often 300–400 CFM) get installed by default to save money
Recirculating hoods (no exterior vent) advertised as "easier install" actually do nothing for moisture, grease, or odor
Over-the-range microwave-hoods are deeply under-rated (200–400 CFM typical) and have terrible capture efficiency
Duct work undersized for the hood CFM, choking the airflow even when the hood itself is adequate

The hood types

Wall-mount hoods

Hood mounts on the wall above the range, vents through wall or up through ceiling. Cleanest install, most efficient capture (hood is right above the cooking).

Island hoods

Hood hangs from ceiling above an island cooktop. More visible (becomes architectural element), requires longer duct runs through ceiling, slightly less efficient capture (air can drift around the open sides).

Insert hoods (hidden in a custom hood surround)

A bare hood liner with motor and lights, designed to be installed inside a built-out hood surround (often plaster, wood, or metal cladding). The custom look without buying a fully-finished hood. Common in high-end design.

Downdraft (range with built-in down-venting)

Pop-up vent at the back of the cooktop, pulls air downward and outside. Adequate for moderate cooking but never as effective as overhead capture for heavy cooking. Compromise solution for islands where overhead hoods are unwanted.

Recirculating (no exterior vent)

Hood runs air through a charcoal filter and returns it to the room. Does nothing for moisture, only marginally captures grease. Use only when external venting is physically impossible (apartments, certain renovations).

The make-up air requirement

Above 400 CFM, building codes (IRC and IMC) require make-up air — an equivalent flow of outside air brought into the house to replace what the hood exhausts. Without make-up air, a high-CFM hood depressurizes the house, backdrafts furnaces and water heaters (carbon monoxide risk), and pulls air down chimneys. Spec the make-up air system with the hood — usually a dedicated duct with a damper that opens when the hood runs.

Free Download

The Ultimate Home Building Checklist

300+ items across 12 phases. The internal field document we walk every Angel home through. Yours, free.

Get the Checklist

Ductwork — the spec that limits everything else

A 1200 CFM hood with 6" round ducting is functionally a 600 CFM hood — the duct chokes the airflow. Duct sizing:

300–400 CFM: 6" round (or equivalent rectangular)
400–600 CFM: 7" round
600–900 CFM: 8" round
900–1200 CFM: 10" round
1200+ CFM: 12" round

Every 90-degree elbow in the duct reduces effective CFM by 10–20%. Long horizontal runs reduce performance. Best practice: short, straight, large-diameter duct from hood to exterior.

Hood height above the cooking surface

Most manufacturers recommend 30–36" between the cooking surface and the bottom of the hood. Lower (28") gives better capture but interferes with cooking visibility. Higher (40"+) loses capture efficiency.

For high-BTU pro ranges (BlueStar, Wolf), bias lower — 28–30". For standard 30" ranges, 30–33" works.

Premium brands

Vent-A-Hood: Texas-based, exceptional quality and warranty. Magic Lung blower is their signature.
Best (formerly Broan): wide range, mid-tier
Wolf (matched to Wolf ranges): integrated aesthetic with their pro ranges
Zephyr: contemporary design, good performance
Faber: Italian, design-led
Sirius: contemporary modular hoods, often used with island cooktops

What we spec by range

30" standard range: 400–600 CFM wall-mount, 7" duct
36" pro-style range (Wolf, Viking): 900 CFM wall-mount, 8" duct, make-up air
48" pro-style range (BlueStar, Wolf): 1200 CFM wall-mount, 10" duct, make-up air, possibly a hood with two blowers
60" pro-style range with grill/wok: 1500 CFM hood, 12" duct, make-up air, dual blowers, possibly remote-mounted blower (mounted outside the house) for quieter operation

The bottom line

Most kitchens are under-ventilated by 50% or more. The hood is one of the most important kitchen appliances and is routinely shorted. Spec the right CFM for your range, size the ducting to match, install make-up air per code, and your kitchen stays fresh after cooking instead of smelling like every meal you've ever made.

— Daniel Caro, Construction Manager. Twenty years running jobsites — foundation, framing, mechanicals, and the unglamorous details that decide a great home. Get the free Ultimate Home Building Checklist for the field-tested list we walk every Angel home through.