The tipping floor is the place where the trucks unload the municipal solid waste (MSW) into the refuse bunker. The refuse bunker is divided into seperate regions called cells. The MSW is stacked vertically in order to conserve cell space. The new MSW is checked to ensure that large items such as mattresses, large metal objects etc. do not impede combustion in the burner. Aeration is very important for the reduction of intense putrid odors in the refuse bunker. The MSW is frequently moved in order to promote aeration. Induced draft fans are a necessity to reduce the putrescible odors.