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Infiltration meets ACH50 requirements

The U.S. Department of Energy (DOE) Zero Energy Ready Home National Program Requirements specify that homes can follow either a prescriptive or performance path to be certified. Homes following the prescriptive path must meet all of the requirements listed in the Program Requirements Exhibit 1 and 2. Homes following the performance path must match the level of performance of a target home constructed to meet all of the mandatory requirements listed in the National Program Requirements Exhibit 1 and all of the requirements listed in Exhibit 2. Exhibit 2 includes infiltration limits, which are shown in Table 1.

Table 1 shows the maximum infiltration or whole-house air leakage allowed in each climate zone. Limits are given in air changes per hour at 50 Pascals pressure difference.

Table 1. Excerpt from Exhibit 2: DOE Zero Energy Ready Home Target Home Showing the Infiltration Requirements

How to Determine Infiltration

Building envelope leakage should be determined by an approved verifier using a testing protocol approved by the Residential Energy Services Network (RESNET). Whole-house air leakage testing is conducted with a blower door test.

Climate zones are based on the Climate Zone Map, which can be found in the 2012 International Energy Conservation Code (2012 IECC Figure C301.1):

IECC climate zone map
Figure 1. IECC climate zone map.


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Last Updated: Friday, August 1, 2014