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Your range hood runs every time you cook, pulling grease-laden air from above the stove and passing it through a filter. Over months of daily use, that filter becomes saturated. Grease migrates past the filter into the interior housing, coats the fan blades, and accumulates in the exhaust pathway. From the outside, your hood might look reasonably clean. Inside, it is a different story.
Before anything is disassembled, the stovetop and surrounding counters are covered with protective sheeting. Grease and dirty water will come out of the hood during cleaning, and your kitchen surfaces need protection. This step takes about 5 minutes but prevents a secondary mess.
The mesh or baffle filters are removed and examined. Aluminum mesh filters can be cleaned and reused many times. Charcoal filters (used in ductless hoods) cannot be cleaned and need replacement when saturated. The filter condition tells the technician how much buildup to expect inside the hood body.
Aluminum filters are submerged in a hot alkaline degreasing solution. They soak for 15 to 30 minutes while the technician works on other components. After soaking, the filters are rinsed with hot water until completely clear. A heavily used filter goes from dark brown and opaque to silver and see-through.
With the filters out, the interior surfaces of the hood are accessible. Degreaser is sprayed on all interior walls, the grease channel, and the area around the fan housing. This is allowed to dwell for several minutes to soften the carbonized grease layer. Technicians then use scrapers and cloths to remove the softened grease. Multiple applications may be needed for hoods that have not been cleaned in over a year.
The fan blades are cleaned of grease buildup that causes vibration and noise. The motor housing exterior is wiped clean. In some hood models, the fan assembly can be partially removed for better access. Balanced, clean fan blades spin quietly and move air more efficiently.
The outside of the hood, including the control panel, light covers, and decorative trim, is cleaned with appropriate products. Stainless steel surfaces are polished. Touch panels are cleaned with electronics-safe wipes. Light covers are removed, cleaned of grease and dead insects, and replaced.
Clean, dry filters are reinstalled. The hood is turned on at each speed setting to verify proper operation. The technician checks for unusual noise, vibration, or reduced airflow that might indicate a deeper issue. The protective covering is removed from your stovetop, and the kitchen is left clean.
A clean hood extracts air 30 to 50 percent more effectively than a clogged one. You will notice that cooking smoke clears faster, grease settles less on surrounding surfaces, and the fan runs quieter. If your hood has a light, it will appear brighter because the grease film on the cover has been removed.
