ISSN: 0090-3973
Published Online: 21 October 2004
Page Count: 8

The Generalized Subtraction Correction Algorithm for Measuring Duct Leakage Using a Blower Door

Katz, M
Energy & Building Science Consultant,Wisznia Associates, AIA,LA,

Witriol, NM
Louisiana Tech University,LA,

Erinjeri, J
Louisiana Tech University,LA,

(Received 6 November 2003; accepted 20 April 2004)

Abstract

The Generalized Subtraction Correction Algorithm (GSCA) improves upon the Modified Subtraction method for determining duct-leakage-to-outside using only a blower door. GSCA utilizes attic pressure both to calculate a generalized Subtraction Correction Factor and to properly identify and assign the correct pressure difference between the ducts and attic responsible for the calculated duct-leakage flow. This paper also describes the normal procedures that enhance the accuracy of data collection and the subsequent tests on the resulting information for validating the applicability of GSCA to an individual home. GSCA collects associated pressure-coupling data and enhances the reliability of house-leakiness results.

Keywords:
Subtraction Correction Factor, duct leakage, attic pressure, house leakiness, energy efficiency, attic-to-home pressure-coupling ratio, automated performance testing equipment, blower door, Duct Blaster™, pressure pan, CFM50, infiltration, energy ratings, air leakage in buildings

Paper ID: JTE11723
DOI: 10.1520/JTE11723
ASTM International is a member of CrossRef.