Range Hood Not Sucking Up Grease? The Complete Fix Guide for Every Home Cook

If your range hood is running but nothing is changing — grease is sticking to your counters, your walls are glossy, and the air still smells like last night's fried dinner — you're dealing with one of the most frustrating kitchen appliance problems. The good news: in the vast majority of cases, this is a fixable issue that doesn't require a professional handyman.

This guide walks through every common cause of poor grease extraction, from the simplest maintenance oversight to hardware failures, with clear diagnostic steps and actionable fixes.

Key Takeaways

• Most common cause: Clogged or saturated charcoal/baffle filters are the #1 reason range hoods lose suction power.
• Dirt buildup on fan blades is nearly as common and easy to miss because it's hidden inside the housing.
• Improper ductwork — too many bends, wrong diameter, or a backdraft damper stuck shut — can reduce ventilation by 50% or more.
• Recirculating vs. ducted confusion is a frequent source of disappointment; recirculating hoods cannot remove grease the way vented hoods do.
• Fix cost range: $0 (cleaning) to $150–$400 (duct repair or blower motor replacement).

Step 1: Identify Your Hood Type — This Changes Everything

Before you open any panels, confirm whether your range hood is ducted (vented outside) or recirculating (dowel-filter only). This single classification determines which fixes will actually work.

Still not sure which type you have? Look above your stove. If you see a metal chimney or rectangular duct running up the wall or through the cabinet toward the outside, it's ducted. If the unit simply pulls air in and pushes it back out through the front or sides, it's recirculating.

Step 2: The 5 Most Common Causes of Weak Grease Extraction

1. Clogged or Saturated Filters (Check This First)

Metal mesh and baffle filters trap grease particles before they reach the blower. Over time, these layers of captured oil create increasing resistance to airflow. A fully loaded filter can reduce your hood's CFM (cubic feet per minute) by 40–60%.

How to check: Remove your filters and hold them up to a light. If you can't see through the gaps between the metal layers, they need immediate cleaning or replacement.

The fix:

• Soak aluminum mesh filters in warm soapy water for 15 minutes, then scrub with a nylon brush.
• For baffle filters, run them through a hot-cycle dishwasher cycle (confirm they are dishwasher-safe in your manual).
• Replace filters every 6–12 months depending on cooking frequency.

2. Dirty or Grease-Caked Fan Blades

This is the most overlooked cause. When grease coats the blower fan, it adds weight and unbalances the impeller, reducing rotational speed and airflow volume. You won't see this problem until you remove the filter housing.

How to check: Remove the lower filter tray and shine a flashlight into the blower housing. If the fan blades look shiny and dark instead of clean metal, that's your problem.

The fix:

• Turn off power to the range hood at the circuit breaker before touching anything.
• Remove the fan assembly if your model allows it (many do — check your manual).
• Soak the fan in degreaser solution, then scrub with an old toothbrush or small brush.
• Wipe the interior housing walls with degreaser while the cover is off.
• Reassemble and test. Most homeowners see an immediate and dramatic improvement.

3. Blocked or Restrictive Ductwork

Air needs a clear path from the hood to the outside. Every 90-degree elbow, flexible duct section, or bird-guard screen reduces airflow. A standard range hood moves 300–600 CFM; poor duct design can cut that in half before the air ever leaves your home.

4. Incorrect Fan Speed or Wrong Settings

Modern range hoods offer multiple speed settings. If yours defaults to a low setting or if a family member changes the speed regularly without your knowledge, you may simply be running it on "silent" mode when you need "boost."

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