An elongated housing of a portable forced air unit is provided with a combustion chamber located therein. One or more side covers of the controls compartment protects the compartment from weather or more specifically water related damage or malfunction. The one or more side covers direct external water away from the controls compartment and may also direct internal water within the controls compartment away from electronic devices contained therein. A successive higher overlapping of the housing, one or more side covers, and the fuel tank assembly may cascade external water away from the unit.