What Is A Blower Door Test And When Is It Used?

January 28th, 2024 BY First American Roofing

When it comes to maintaining a comfortable and energy-efficient home, there are various tools and techniques at your disposal. One of these tools is a blower door test, a valuable assessment method used to evaluate a home’s airtightness and energy efficiency. In this homeowner’s guide, we’ll demystify the blower door test, explain when and why it’s used, and explore its benefits. Whether you’re a new homeowner or a seasoned pro, understanding this test can help you make informed decisions about your home’s energy performance. Let’s dive in!

Inside this blog:

Keep reading to learn more about blower door tests and how they can help you become an empowered homeowner!

What Is a Blower Door Test? πŸšͺ


A blower door test is a diagnostic tool used to measure the airtightness of a building, primarily residential homes. It involves the use of a specialized fan (the blower door) that is temporarily installed in an exterior door or window frame. The blower door system includes a powerful fan, a frame with adjustable panels to seal the doorway or window, and a digital pressure gauge to measure air pressure differentials.

During the test, the blower door fan depressurizes or pressurizes the interior of the house, creating a consistent pressure difference between the inside and outside. This pressure difference allows technicians to identify areas where air leakage is occurring and to quantify the overall level of airtightness in the home.

When Is a Blower Door Test Used?

Now that we know what a blower door test is, let’s explore when and why it’s used in residential settings with 5 scenarios.

1. Energy Audits and Assessments

2. Home Weatherization and Retrofitting

3. New Construction and Building Performance

4. Indoor Air Quality and Comfort

5. Energy Savings and Cost Reduction

The Blower Door Test Process in 6 Steps πŸ”„


Here’s a brief overview of what you can expect during a blower door test:

1. Setup

The blower door equipment is set up in an exterior door or window, creating an airtight seal.

2. Pressure Adjustment

The fan is turned on, and the pressure inside the house is either pressurized or unpressurized to a standardized level.

3. Measurement

A digital pressure gauge measures the pressure differential and airflow rate, providing data on the home’s airtightness.

4. Testing

Technicians use smoke pencils or infrared cameras to identify air leaks as the fan runs.

5. Analysis

The gathered data is analyzed to determine the air changes per hour (ACH) at a specified pressure difference (often 50 Pascals).

6. Report

A report is generated, detailing the results and recommendations for improving energy efficiency.

6 Benefits of a Blower Door Test πŸ†

Now that you know when and how a blower door test is used let’s explore the benefits it offers homeowners:

1. Pinpoint Air Leaks with Precision

2. Quantify Airtightness

3. Enhance Energy Efficiency

4. Prioritize Home Upgrades

5. Ensure Code Compliance

6. Improve Indoor Air Quality

When to Schedule a Blower Door Test

If you’re considering a blower door test for your home, here are some scenarios when it’s a good idea:

Become an Empowered Homeowner & Try a Blower Door Test 🌬️

A blower door test is a valuable tool that allows homeowners to evaluate their home’s airtightness, identify air leaks, and prioritize energy-efficient improvements. Whether you’re looking to lower your energy bills, improve indoor comfort, or ensure your new construction meets energy efficiency standards, a blower door test can provide essential insights. Consider scheduling a test to gain a better understanding of your home’s energy performance and take steps toward a more comfortable, efficient, and cost-effective living space. It’s a smart investment in your home’s future!

Contact our expert team of roofers at First American Roofing today. We’re eager to help you figure out the best course of action for your next roofing project!Β