A surface cleaning apparatus comprises an air flow passage extending from a dirty air inlet to a clean air outlet. At least one pair of elongate actuator arms are anchored at a fixed end to the substrate and connected to the drive circuitry. Either the generating part of a soft X-ray generating device, the generating part of a low-energy electron beam generating device or the generating part of an ultraviolet radiation generating device is used as the ionization source. In the collapsed position, the flexible cover is substantially planar, in the expanded position, the flexible cover is able to cover loads taller than the sidewalls of the vehicle cargo area. The invention further relates to apparatus for treating hazardous material and for decontaminating items that may have come into contact with it, the apparatus comprising a treatment vessel or chamber and a light source capable of irradiating a catalyst within the treatment vessel or chamber with a predetermined wavelength of light. Fasteners attach the window frame to the framing members through the metal building wall.