Double air duct boot

A double air duct boot comprising:

• a hollow central section which includes:
• a pair of opposed, spaced, arcuate side walls each formed as a segment of a cylinder, with each formed on the same radius of curvature, and said opposed side walls having the concave sides of the two arcuate side walls facing each other;
• a pair of opposed, spaced, parallel transverse walls joining the opposed side walls;
• and
• a pair of opposed, spaced, parallel end walls each extending perpendicular to the transverse walls and each joining the opposed side walls and each having its opposite ends connected to the transverse walls;
• said central section made up of said side walls, transverse walls and end walls being formed as two identical halves joined at a central parting plane lying midway between said spaced semicylindrical side walls;
• a pair of opposed, hollow parts molded integrally with, and connected to, said central section, each of said parts including:
• a hollow, frustoconical, tubular riser section having a rectangular cross-section over its length;
• and
• an intermediate section formed integrally with, and interconnecting, said frustoconical, tubular riser section and said central section.