> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Side Duct Body

> AI context for Side Duct Body. Not linked in navigation.

> This page is for AI assistant context only. To use this package, visit [community.ntop.com](https://community.ntop.com/packages/ntop/side-duct-body).

> **Community submission — not verified by nTop.** This package was submitted by an outside community member and has not been reviewed or verified by nTop. Treat its accuracy, safety, and compatibility claims with appropriate caution.

## Summary

Creates an air duct implicit body that transitions from a parallelogram cross-section at the inlet to a circular cross-section at the outlet, following a user-defined spline path.

## Package Details

| Field            | Value                                                                                       |
| ---------------- | ------------------------------------------------------------------------------------------- |
| **ID**           | `side-duct-body`                                                                            |
| **Type**         | Block                                                                                       |
| **Author**       | nTop                                                                                        |
| **Version**      | 1.0.4                                                                                       |
| **nTop Version** | 5.28+                                                                                       |
| **Domain**       | Aerospace                                                                                   |
| **Complexity**   | Intermediate                                                                                |
| **Tags**         | `duct`, `aerospace`, `spline`, `implicit`, `inlet`, `outlet`, `transition`, `parallelogram` |
| **License**      | MIT                                                                                         |
| **Verified**     | No                                                                                          |

***

Creates an air duct implicit body that transitions from a parallelogram cross-section at the inlet to a circular cross-section at the outlet. The duct follows a user-defined spline path from inlet to outlet.

## Inputs

| Name            | Type          | Description                                            |
| --------------- | ------------- | ------------------------------------------------------ |
| Inlet Location  | Point         | 3D position of the duct inlet center                   |
| Inlet Width     | Real (length) | Width of the parallelogram cross-section at the inlet  |
| Inlet Height    | Real (length) | Height of the parallelogram cross-section at the inlet |
| Inlet Radius    | Real (length) | Blend radius smoothing the inlet cross-section corners |
| Inlet Angle     | Real (angle)  | Side angle of the parallelogram at the inlet           |
| Outlet Location | Point         | 3D position of the duct outlet center                  |
| Outlet Radius   | Real (length) | Radius of the circular cross-section at the outlet     |

## Outputs

| Name    | Type     | Description                    |
| ------- | -------- | ------------------------------ |
| Bounded | Implicit | The bounded duct implicit body |

## Notes

* The duct path is defined by a spline connecting the inlet and outlet locations. Path curvature is controlled by **Path Start Tension** and **Path End Tension** internal parameters (default 1.27).
* **Transition Continuity** controls the smoothness of the cross-section transition along the path (default: tangent continuous).
* The outlet diameter is computed as `2 × Outlet Radius`.
* A **Butt Line Zero** reference plane is established at the origin for coordinate alignment.

***

## Source

[https://community.ntop.com/packages/ntop/side-duct-body](https://community.ntop.com/packages/ntop/side-duct-body)