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Home arrow Resources arrow ASHRAE Glossary
Glossary

 

The terms and definitions included in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation, Air Conditioning & Refrigeration".
To access the complete glossary please visit ASHRAE's Bookstore.


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water vapor permeance

 

water vapor transmission of a body between two specified parallel surfaces, induced by the vapor pressure difference between two surfaces. The test conditions must be stated. An accepted unit of water-vapor permeance is the perm. Note: Permeance is a performance evaluation and not a property of a material. See perm; rep.

 

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