Flexible duct system

A flexible duct system for connecting between an air handling unit and one or more building spaces for passing building air between the air handling unit and the one or more building spaces, the flexible duct system comprising:

• a first fitting connected to the air handling unit, said first fitting having a first fitting longitudinal axis, a first end facing in a first direction and connected to the air handling unit for passing an air flow there-between, and a second end which is distally disposed from the air handling unit, said second end defining a second terminal end and having a second end profile;
• a first flexible duct having a first end portion fitting over said second end profile of said first fitting, and said first flexible duct further having a second end portion which is distally disposed from said first end portion;
• a first band extending around said first end portion of said first flexible duct and engaging against said second end profile to fixedly secure said first end portion of said first flexible duct to said first fitting;
• a second fitting which is spaced apart from said first fitting, said second fitting having a second fitting longitudinal axis and a forward end which defines a third terminal end, said forward end having a third end profile;
• said second portion of said first flexible duct section fitting over said third end profile of said second fitting;
• a second band extending around said second end portion of said first flexible duct and engaging against said third end profile to fixedly secure said second end portion of said first flexible duct to said forward end of said second fitting;
• and
• said first and second fittings each having at least one support member which exteriorly extends from an intermediate portion of a respective one of said first and second fittings, providing mounts for fixedly securing said first and second fittings in fixed relation to the building, and wherein said support members define support bars which extend in spaced apart relation from exterior surfaces of respective ones of said first and second fittings.

A flexible duct system for connecting between an air handling unit and one or more building spaces for passing building air between the air handling unit and the one or more building spaces, the flexible duct system comprising:

• a first fitting connected to the air handling unit, said first fitting having a first fitting longitudinal axis, a first end facing in a first direction and connected to the air handling unit for passing an air flow there-between, and a second end which is distally disposed from the air handling unit, said second end defining a second terminal end and having a second end profile;
• a first flexible duct having a first end portion fitting over said second end profile of said first fitting, and said first flexible duct further having a second end portion which is distally disposed from said first end portion;
• a first band extending around said first end portion of said first flexible duct and engaging against said second end profile to fixedly secure said first end portion of said first flexible duct to said first fitting;
• a second fitting which is spaced apart from said first fitting, said second fitting having a second fitting longitudinal axis and a forward end which defines a third terminal end, said forward end having a third end profile;
• said second portion of said first flexible duct section fitting over said third end profile of said second fitting;
• a second band extending around said second end portion of said first flexible duct and engaging against said third end profile to fixedly secure said second end portion of said first flexible duct to said forward end of said second fitting;
• and
• wherein at least one of said ends of said first and second fitting have multiple end profiles, each of said multiple end profiles disposed in alignment for tapering in an outward direction for being received in respectively smaller nominal sizes of flex ducting.

A flexible duct system for connecting between an air handling unit and one or more building spaces for passing building air between the air handling unit and the one or more building spaces, the flexible duct system comprising:

• a transition fitting mounted to a plenum connected directly to the air handling unit, said transition fitting providing a square to round transition having a transition fitting longitudinal axis, a first end facing in a first direction and having a square shape which is mounted directly to the plenum, and a second end which is distally disposed from the plenum, said second end defining a second terminal end and which is of a round shape having a second end profile which includes a tapered surface and a catch shoulder, wherein said tapered surface circumferentially extends around said transition fitting longitudinal axis and faces in a second direction which extends outward of said transition fitting with said tapered surface narrowing in the second direction, and said catch shoulder faces in a direction opposed to said second direction and is spaced apart from said second terminal end to define an abutment;
• a first flexible duct having a first end portion fitting over said tapered surface and said catch shoulder of said second end of said transition fitting, and said first flexible duct further having a second end portion which is distally disposed from said first end portion;
• a first band extending around said first end portion of said first flexible duct and engaging against said catch shoulder to fixedly secure said first end portion of said first flexible duct to said transition fitting;
• a second fitting which is spaced apart from said transition fitting, said second fitting having a second fitting longitudinal axis and a forward end which defines a third terminal end, said forward end having a third end profile which includes a third tapered surface and a third catch shoulder, wherein said third tapered surface circumferentially extends around said second fitting longitudinal axis and faces in a third direction which extends outward of said second fitting with said third tapered surface narrowing in the third direction, and said third catch shoulder faces in a general direction opposed to said third direction and is spaced apart from said third terminal end to define a third abutment;
• said second portion of said first flexible duct fitting over said third tapered surface and said third catch shoulder of said second fitting;
• and
• a second band extending around said second end portion of said first flexible duct and engaging against said third catch shoulder to fixedly secure said second end portion of said first flexible duct to said forward end of said second fitting.

A flexible duct system for connecting between an air handling unit and one or more building spaces for passing building air between the air handling unit and the one or more building spaces, the flexible duct system comprising:

• a transition fitting mounted to a plenum connected directly to the air handling unit, said transition fitting having a transition fitting longitudinal axis, a first end facing in a first direction and mounted directly to the plenum, and a second end which is distally disposed from the plenum, said second end defining a second terminal end and having a second end profile which includes a tapered surface and a catch shoulder, wherein said tapered surface circumferentially extends around said transition fitting longitudinal axis and faces in a second direction which extends outward of said transition fitting with said tapered surface narrowing in the second direction, and said catch shoulder faces in a direction opposed to said second direction and is spaced apart from said second terminal end to define an abutment;
• a first flexible duct having a first end portion fitting over said tapered surface and said catch shoulder of said second end of said transition fitting, and said first flexible duct further having a second end portion which is distally disposed from said first end portion;
• a first band extending around said first end portion of said first flexible duct and engaging against said catch shoulder to fixedly secure said first end portion of said first flexible duct to said transition fitting;
• a second fitting which is spaced apart from said transition fitting, said second fitting having a second fitting longitudinal axis and a forward end which defines a third terminal end, said forward end having a third end profile which includes a third tapered surface and a third catch shoulder, wherein said third tapered surface circumferentially extends around said second fitting longitudinal axis and faces in a third direction which extends outward of said second fitting with said third tapered surface narrowing in the third direction, and said third catch shoulder faces in a general direction opposed to said third direction and is spaced apart from said third terminal end to define a third abutment;
• said second portion of said first flexible duct fitting over said third tapered surface and said third catch shoulder of said second fitting;
• a second band extending around said second end portion of said first flexible duct and engaging against said third catch shoulder to fixedly secure said second end portion of said first flexible duct to said forward end of said second fitting;
• and
• said second and third fittings each having at least one support member which exteriorly extends from an intermediate portion of a respective one of said second and third fittings, providing mounts for fixedly securing said second and third fittings in fixed relation to the building, and wherein said support members define support bars which extend in spaced apart relation from exterior surfaces of respective ones of said second and third fittings.

A flexible duct system for connecting between an air handling unit and one or more building spaces for passing building air between the air handling unit and the one or more building spaces, the flexible duct system comprising:

• a transition fitting mounted to a plenum connected directly to the air handling unit, said transition fitting having a transition fitting longitudinal axis, a first end facing in a first direction and mounted directly to the plenum, and a second end which is distally disposed from the plenum, said second end defining a second terminal end and having a second end profile which includes a tapered surface and a catch shoulder, wherein said tapered surface circumferentially extends around said transition fitting longitudinal axis and faces in a second direction which extends outward of said transition fitting with said tapered surface narrowing in the second direction, and said catch shoulder faces in a direction opposed to said second direction and is spaced apart from said second terminal end to define an abutment;
• a first flexible duct having a first end portion fitting over said tapered surface and said catch shoulder of said second end of said transition fitting, and said first flexible duct further having a second end portion which is distally disposed from said first end portion;
• a first band extending around said first end portion of said first flexible duct and engaging against said catch shoulder to fixedly secure said first end portion of said first flexible duct to said transition fitting;
• a second fitting which is spaced apart from said transition fitting, said second fitting having a second fitting longitudinal axis and a forward end which defines a third terminal end, said forward end having a third end profile which includes a third tapered surface and a third catch shoulder, wherein said third tapered surface circumferentially extends around said second fitting longitudinal axis and faces in a third direction which extends outward of said second fitting with said third tapered surface narrowing in the third direction, and said third catch shoulder faces in a general direction opposed to said third direction and is spaced apart from said third terminal end to define a third abutment;
• said second portion of said first flexible duct fitting over said third tapered surface and said third catch shoulder of said second fitting;
• a second band extending around said second end portion of said first flexible duct and engaging against said third catch shoulder to fixedly secure said second end portion of said first flexible duct to said forward end of said second fitting;
• and
• wherein at least one of said third and fourth ends of said second fitting have multiple end profiles, each of said multiple end profiles disposed in alignment for tapering in an outward direction for being received in respectively smaller nominal sizes of flex ducting.