The catalog has a total of 804 items which fall into:

BlindDisk

Plenum Boxes, PL

Cap

Circular Ducts, PL

Coupling

Rectangular Offsets, PL

Round Offsets, PL

Round Take Offs, PL

Cross

Rectangular Crosses Rectangular, PL

Rectangular Crosses Straight, PL

Elbow

Circular Elbows 30, PL

Circular Elbows 45, PL

Circular Elbows 60, PL

Circular Elbows 90, PL

Rectangular Elbows 30, PL

Rectangular Elbows 45, PL

Rectangular Elbows 60, PL

Rectangular Elbows 90, PL

Olet

Collar Saddles, PL

Reducer

Circular Reducers Concentric, PL

Circular Reducers Eccentric, PL

Rectangular Reducers, PL

Rectangular to Round Transitions, PL

Straight Duct

Circular Ducts, PL

Fire Rated Rectangular Ducts, PL

Fire Rated Single Wall Ducts, PL

Spiral Ducts, PL

Straight Rectangular Ducts, PL

Tee

Circular Tees, PL

Rectangular Tee Rectangular, PL

Rectangular Tee Straight, PL

Valve

Circular Volume Control Damper, PL

Rectangular Volume Control Damper, PL

Wye

Rectangular Y-Branches, PL 

Size range: 100 - 1500mm

Advantages:

• Straight duct can be dynamically stretched so no need to input value each time created. It automatically snaps the correct position.
• 100% Python part
• Detail and lightweight
• Built-in catalog which is ready to use
• Parametric ready to make your own custom catalog

Check out the Screenshot for available components. 

Note: This app uses a custom installer (and not the standard App Store installer).