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Goal: Understand how water vapor can enter indoors via diffusion & infiltration and cause indoor air quality problems.

Lesson 1: Vapor Diffusion

Objective – Explain how vapor pressure differentials can drive moisture through materials via diffusion. Also, be able to describe how materials can be measured for permeability and know where they should be placed in different climates.

Lesson 2: Air Infiltration

Objective – Describe how leakage paths and pressure differences cause air infiltration, which can lead to indoor air quality problems.