---
title: "How Often to Clean Hood Filters Over a Range Like This One"
description: "How often should you clean range hood filters over a La Cornue: every four to six weeks, monthly if you grill, and why it matters."
url: "https://la-cornuemiami.support/blog/how-often-to-clean-hood-filters/"
date_modified: "2026-09-03"
Category: "Maintenance & Prevention"
---


# How Often to Clean Hood Filters Over a Range Like This One

## How often should you clean range hood filter? Why the general advice is wrong over this range

Most sources say every three to six months, and for most kitchens that is fine. Look at what is under this one.

A brass power burner at **22,000 BTU**. A lava-rock grill running a linear burner at **14,500 BTU** under a bed of rock soaked in fat. A cast-iron plaque holding heat across its whole surface with pans working all over it. And on the larger ranges, a gas oven venting into the same room.

That is a great deal more grease-laden air, produced far more often, in a climate where the windows stay shut and the air conditioning is running. **Every four to six weeks** with real use, and **monthly** if the grill or the plaque are part of how you cook.

## The good news: it is free

La Cornue's motorized hoods use **two dishwasher-safe baffle filters with a grease capture system**, not mesh. That is a deliberate choice and it is the reason this maintenance costs nothing.

Baffles work by making the air change direction sharply so grease drops out and drains into a capture channel behind them. They catch more than mesh and they clean up completely — top rack, on their own, hot cycle. If they come out still tacky, they were overdue: degrease them in the sink with hot water first and run them again.

**You do not have a charcoal filter.** Charcoal belongs to a hood that recirculates air into the room, and these are ducted — 600 CFM against an unobstructed six-inch duct on the canopies, eight inches on the inserts. If anybody offers you a charcoal filter for one of these, check what you actually have first.

## The parts behind the filters

Two jobs that are not the filters and get skipped for years.

**The channels and the capture tray.** Behind the baffles is the system that collects what they take out of the air, and it fills. A few times a year, and it is messier than the filters — gloves, hot water, patience.

**The duct.** Once a year, look up it with a torch with the baffles out. A film is normal. A lining you could scrape is a restriction, and so is a **seized backdraft damper** and a **termination cap** that has spent a decade collecting salt and grease on a coastal roof. That cap is the commonest hidden cause of faded extraction in a house near the water, and nobody ever looks at it because it is on the roof.

## Why this protects the range, not just the room

This is the part worth knowing, and it changes how seriously people take the interval.

A hood running at half its rated flow does not simply make the kitchen smell. The grease it fails to catch goes onto the cabinets, onto the ceiling and — eventually — into the cabinet **under the cooktop**, which on an induction range is where the generator lives.

And the one overheating code La Cornue documents, **E2**, is about exactly that: the electronic unit is too hot, and the maker's own first suggestion is the installation of the cooker and whether there is sufficient ventilation.

So a neglected hood shortens the life of the most expensive electronic assembly in the range. Servicing the hood is looking after the range, which is why it is part of an annual maintenance visit here rather than something to attend to when somebody complains.

## Two things that are not filters

**A motor that has started to rumble.** A bearing already worn, and the sequence from there is predictable: more noise, more current, a thermal trip, then a seized motor — usually on a day the kitchen is full. Fixing a rumble on a planned visit costs less than fixing a seizure at short notice.

**One speed only.** That is the four-speed control rather than the blower, and it is a distinct part. Worth fixing rather than living with, because the low speeds are what a hood is meant to run at while something simmers, and a hood nobody switches on because it is deafening is not protecting anything.

## The interval, written down

Put it on the inside of a cupboard door:

- **baffles** — every four to six weeks, dishwasher;- **channels and capture tray** — three or four times a year;- **duct and termination** — looked at annually, cleaned when it needs it;- **blower current and all four speeds** — measured at the annual service.

On a hood that starts at $17,400 and is enamelled to match the range beneath it, that is a very cheap maintenance schedule.

---

**[Read full article: How Often to Clean Hood Filters Over a Range Like This One](https://la-cornuemiami.support/blog/how-often-to-clean-hood-filters/)**