Title: Unit 6 Glossary
Course: HAC 140 Weatherization > Section: HAC 140 Weatherization

Unit 6 Glossary

Terms

Term | Definitions
Can’t reach fifty (CRF) | A factor that extrapolates air flow at lower pressure differences to air flow at 50 pascals pressure difference. Used in blower door diagnostics when the shell is too leaky to allow the blower doo ...
CFM50 | Measurement of air leakage in cubic feet per minute at 50 Pa pressure difference.
Pascals (Pa) | Metric standard for measuring pressure differences. 248 pascals equal one inch of water column, approximately the weight of one Post-it note.
With reference to (WRT) | Compared to another measurement. In weatherization, a way to assess pressure differences between ducts and the rest of the home.
Zone pressure diagnostics (ZPD) | Using a blower door to determine the inter-connectivity of various building components, which helps the practitioner locate the pressure boundary and know if the air and thermal barriers are align ...