Blower Door Test Calculator

Analyze air infiltration test results

Building Information

Floor Area (sq ft)

Ceiling Height (ft)

Number of Stories

Test Results

CFM50 (airflow at 50 Pa)

Climate Zone

Air Leakage Analysis

ACH50 --

Rating --

Building Volume --

CFM50 per sq ft --

Est. Natural ACH --

EqLA (sq in) --

IECC Requirements (ACH50)

Climate Zone	IECC 2018	Energy Star
Zone 1-2	5.0	4.0
Zone 3	3.0	3.0
Zone 4-8	3.0	2.5

ACH50 Rating Scale

< 2.0

Passive House

Exceptional

2.0 - 3.0

Very Tight

High performance

3.0 - 5.0

Tight

Energy code compliant

> 7.0

Leaky

Air sealing needed