A forced air supply combustion apparatus sucks combustion air from an air supply port. An air filter for collecting foreign matters in the air is mounted on an air-supply-port-formed plate in an insertable and drawable manner. A filter frame is arranged to be brought into close contact with a peripheral part of the air supply port in a state of having mounted the air filter in position. The air-supply-port side edge parts are provided with retaining pieces to clamp a filter side frame part in the Z-axis direction against the side edge parts. A distance in the Z-axis direction between the air-supply-port side edge parts, and the retaining pieces is set larger than a dimension, in the Z-axis direction, of the filter side frame part, and is set smaller than a sum of the dimensions to be obtained by adding to said dimensions the projection height of the projections provided in a projecting manner.

Maintaining an operational temperature range of a fuel dispenser component may be accomplished by a variety of systems, devices, and techniques. In one aspect, a fuel dispenser temperature maintenance system includes a centrifugal fan and an airflow separator. The centrifugal fan is detachably mounted to a fuel dispenser and adapted to circulate an airflow from an exterior to an interior of the fuel dispenser; separate the airflow into a conditioning airflow and an ejected airflow; and direct the conditioning airflow directly to a fuel dispenser component. The ejected airflow includes a plurality of particulates. The airflow separator includes a separator inlet adapted to receive the ejected airflow. The airflow separator is adapted to guide the ejected airflow from the separator inlet directly to an exterior of the fuel dispenser through an outlet channel, where the outlet channel is disposed between the airflow separator and the exterior of the fuel dispenser.