The last place I lived in - the cooker hood did exactly this, without even the steel wool. We noticed a growing stain on the ceiling and found out there was no

The last place I lived in - the cooker hood did exactly this, without even the steel wool. We noticed a growing stain on the ceiling and found out there was no outlet, no filter, just a fan blowing the greasy air onto the ceiling. This was a 1 bedroom apartment with one of the ubiquitous "kitchenette"s that are fitted these days, so that landlords don't lose a whole room to a kitchen that exhausted commuting professionals will never use. Our current place has a proper kitchen, but the cooker hood vents outside directly next to the central heating boiler's intake.