Retrotec DucTester 341 - Manual (Page 13)

Page 13 of 83
©Retrotec Inc. 2014
Table 2: Maximum allowable duct leakage (Residential) according to existing Codes
Code:
Based on
2009
IECC
GA
State
Code
WA
State
Code
VT
Residential
Building
Energy Std
ENERGY
STAR
Homes V3
Rev5
Northwest
ENERGY
STAR Homes
CA Title-
24
Code –
Altered
ducts
CA
Title-24
Code –
New
ducts
Based
on
2012
IECC
Region:
AL CT DC DE FL
IA ID IN KY MA
MI MT NC NE
NH NJ NM NV
NY OH OR RI
SC VA
GA WA VT USA
ID
OR
MO
WA
CA CA MD
Test Pressure
± 25 Pa
±
25 Pa +
25 Pa ±
25 Pa ±
25 Pa +
50 Pa +
25 Pa +
25 Pa ±
25 Pa
Units
CFM
/100 sq ft
CFM
/100 sq
ft
CFM
/ sq ft CFM
/100 sq ft CFM
/100 sq ft CFM
/ sq ft CFM
CFM
CFM
/100 sq ft
Max Total Duct
Leakage, at rough
in, NO air handler
4 N/A 0.04 4 N/A N/A N/A
4% of
system
airflow 3
Max Total Duct
Leakage, at rough
in, with air handler
6 6 0.08 3 N/A N/A N/A
6% of
system
airflow 4
Max Total Duct
Leakage, post
construction with
air handler
12 12 0.08 N/A 8
0.06 CFM/ sq
ft
or 75 CFM
15% of
system
airflow 6% of
system
airflow 4
Max Duct Leakage
to Outdoors, post
construction with
air handler
8 8 0.06 6 4 N/A
10% of
system
airflow
N/A N/A
The table is listed from left to right in order of loosest to tightest “Total Duct Leakage” requirements.
Disclaimer: This information is not guaranteed. As Codes are being updated continually, this
table represents the most up to date information available at the time of publishing. Please
refer to “rev” date on cover page of this document to determine date of publishing.
Tighter ducts required