---
title: Download Negative Pressure Forced Expiration
description: The Negative Pressure Forced Expiration manoeuvre is a pressure-driven perturbation which inflates a subject’s lung to Total Lung Capacity before rapidly exposing them to a negative pressure to draw the air out.
---

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# Download

Negative Pressure Forced Expiration Validation

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![forced-exp-manoeuvre_0](https://emka.scireq.com/hs-fs/hubfs/forced-exp-manoeuvre_0.jpeg?width=177&name=forced-exp-manoeuvre_0.jpeg)

The Negative Pressure Forced Expiration (NPFE) manoeuvre is a pressure-driven perturbation which inflates a subject’s lung to Total Lung Capacity (TLC) before rapidly exposing them to a negative pressure to draw the air out

 

**The document provides extensive information regarding:**

- **an overview of the NPFE manoeuver**
- **the importance of the manoeuver**
- **troubleshooting pinch valve error, reservoir presure fluctuation, lung fluid/blocks**

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