• This provision is voluntary and ONLY applies IF credit for airtightness is claimed

Table Source: OBC

If a house airtightness test is equal to or less than one of the applicable airtightness targets specified in the same row of Table 3.1.1.4.A then a substitution may be made in accordance with Table 3.1.1.4.B or Table 3.1.1.4.C.