Resource
Hood Cleaning vs. Hood Filter Cleaning
Two jobs get called the same thing, and the confusion is expensive. One is a nightly kitchen task. The other is a scheduled service on the whole exhaust path.
What filter cleaning is
Baffle filters sit in the front of the hood and force exhaust air to change direction so grease droplets condense and drain instead of travelling up the duct. Cleaning them means pulling each filter, soaking or running it through a warewasher, checking that the baffles are not crushed or warped, and reseating the bank with no gaps. Most kitchens can and should do this in house, nightly or weekly depending on volume.
What hood cleaning is
A professional commercial kitchen hood cleaning covers what the filters did not catch: the plenum behind the filter bank, the canopy interior and capture edges, the grease trough, accessible ductwork through access panels, the vertical riser where reachable, and the exhaust fan housing, blades and hinge hardware. It is performed with degreasers, scrapers and hot-water equipment, with the kitchen protected and wash water contained.
Why filters alone are not enough
- No baffle filter captures every droplet. A meaningful fraction of grease aerosol passes through and condenses further up the system, where staff never see it.
- Filters do nothing for the fan. Rooftop fan housings load up steadily and are a common source of roof staining and imbalance.
- A filter bank with a gap — one missing filter, one warped frame — lets a straight path of grease-laden air into the duct.
- Inspectors and insurers assess the whole exhaust path, not the filter rack.
How the two work together
Good filter discipline is the single cheapest way to extend the life of a cleaning cycle. Kitchens that wash filters on a consistent rota routinely present less duct loading at the next scheduled visit than identical kitchens that do not. That does not remove the need for a full cleaning — it changes how much has to be removed and, over time, can support a longer interval.
Quick comparison
| Filter cleaning | Hood and exhaust cleaning |
|---|---|
| Nightly or weekly | Scheduled interval based on cooking volume and type |
| Kitchen staff | Trained crew with degreasing and containment equipment |
| Filters only | Hood, plenum, trough, accessible duct, riser, fan |
| No documentation | Dated report and photos for inspectors and insurers |
If filters are damaged or no longer seating flush, see hood filter cleaning; if it has been a while since the duct and fan were opened up, start with kitchen exhaust cleaning.