A mounting apparatus comprises a base frame
assembly comprising a first
fixed length support beam and a second
fixed length support beam positioned parallel to one another, separated by a first distance, a first adjustable support beam and a second adjustable support beam positioned perpendicular to the first
fixed length support beam, and a third adjustable support beam and a fourth adjustable support beam positioned perpendicular to the second fixed length support beam, wherein the first adjustable support beam and the fourth adjustable support beam are separated by a second distance to the second adjustable support beam and the third adjustable support beam, The first adjustable support beam comprises a first sliding extension
assembly, the second adjustable support beam comprises a second sliding extension
assembly, the third adjustable support beam comprises a third sliding extension assembly, and the fourth adjustable support beam comprises a fourth sliding extension assembly, wherein each of the first sliding extension the second sliding extension assembly, the third sliding extension assembly, and the fourth sliding extension assembly is extendable to a maximum extension length and to a minimum extension length. The base frame also comprises at least four leveling indicators, wherein a first leveling indicator of the at least four leveling indicators is attached to the first fixed length support beam, a second
levelling indicator is attached to the second fixed length support beam, a third
levelling indicator is attached to the first adjustable support beam, and a fourth
levelling indicator is attached to the third adjustable support beam. The mounting apparatus also comprises a drain pan hanger assembly comprising a first drain pan hanger attached to the first fixed length support beam, a second drain pan hanger attached to the second fixed length support beam, and a third drain pan hanger attached to the adjustable support beams, wherein each of the first drain pan hanger, the second drain pan hanger, the third drain pan hanger, and the fourth drain pan hanger is configured to support a sliding drain pan structure. The mounting apparatus also comprises an asymmetrical folding mechanism comprising a first folding assembly positioned along the first and the fourth adjustable support beams and a second folding assembly positioned along the second and the third adjustable support beams, wherein that the first folding assembly is located
proximate to the second fixed length support beam, and the second folding assembly is located
proximate to the first fixed length support beam.