What Is a Ducted Range Hood? | Exhausts Cooking Air Outside

If you’re wondering what is a ducted range hood, the short answer is that it is the ventilation system that actually pushes cooking byproducts out of the house, rather than filtering and recirculating them back into the kitchen. This direct path to the outdoors is why ducted hoods are widely considered the more powerful option for anyone who cooks regularly, especially with high heat or heavy meals.

Here is how they work, what to look for, and the mistakes that quietly ruin their performance.

How a Ducted Range Hood Works

A ducted hood’s fan pulls air upward from the cooktop into the hood body. That air then travels through a duct run—typically rigid metal pipe—to an exterior vent on your wall or roof. A backdraft damper inside the system stops outside air from flowing back in when the fan is off.

The payoff is real. Ductless hoods pass air through a filter and return it to the room, which leaves smoke and heat behind. A ducted system removes them entirely. KitchenAid’s guidance notes this makes vented hoods more effective at clearing the air, which is why they’re usually the preferred choice for serious cooking.

Ducted vs. Ductless: The Core Difference

The distinction is simple: does the air leave the house or not? Ducted hoods, sometimes called vented or external venting hoods, exhaust air outdoors. Ductless (recirculating) hoods filter it and blow it back into the kitchen.

• Ducted: removes smoke, grease, heat, and moisture completely
• Ductless: traps some particles and grease, but heat and odors linger

That one difference drives everything else. If your kitchen has no route to an exterior wall or ceiling, a ducted hood won’t function properly—it needs that physical path outside to do its job.

Sizing and Installation Rules That Matter

Matching the hood to your cooktop and ductwork is where most installations go wrong. Follow these guidelines for a system that actually performs.

Width and Height

Standard hood widths are 24, 30, and 36 inches. Choose one at least as wide as your cooktop, ideally about 3 inches wider on each side. Mount the hood 20–30 inches above the surface—Whirlpool specifies 20–24 inches for electric cooktops and 24–30 inches for gas.

Duct Size and Length

The duct must match your fan’s airflow (measured in CFM, or cubic feet per minute). Undersized ducting chokes the system and makes it loud and ineffective.

Keep the run short and straight. Whirlpool advises against more than two elbows, and Proline recommends a 30-foot maximum total run with penalties for each bend. Smooth, rigid galvanized steel or aluminum ducting is the standard for decent performance; flexible duct restricts airflow.

If you’re ready to compare models, our tested roundup of the best ducted range hoods covers top performers across budgets.

Common Mistakes to Avoid

The biggest errors are easy to spot once you know what to look for. Confusing ducted and ductless is the most common—a recirculating hood never vents outdoors, no matter what its marketing claims. Beyond that, watch for these:

• Undersized ducts: always match the duct to the hood’s CFM rating
• Too many elbows: each bend cuts airflow significantly
• Excessive duct length: long runs weaken suction at the cooktop
• Mounting too high: a hood above 30 inches loses capture power

Get these basics right and a ducted hood will clear smoke and grease from your kitchen for years. Get them wrong and even a high-CFM model will underperform.