You asked: What is the point of a blower door test?

A blower door test is used on buildings in order to quantify the amount of air leakage through its enclosure. During this test, a calibrated fan is installed in an otherwise sealed door or window, while all the other openings to the exterior are closed.

Is a blower door test worth it?

Anyone thinking of buying a house or building one should consider having a blower door test performed. It will help determine the cost of future energy bills. … A pressure gauge measures the amount of air pulled out of the house by the fan and coming in through unsealed cracks and openings.

How hard is it to pass a blower door test?

It is estimated that 50% of newly constructed homes will fail the blower door or air-tightness test. Most blower door test failures occur because of a lack of understanding of what is necessary to create a continuous air barrier system.

How long does a blower door test take?

How long does a blower door test take? The preparation and the breakdown for the blow door test takes longer than the test. The set up can take between 90 minutes and two hours, depending on the size of our house. The test itself can take between ten to twenty minute and the breakdown another hour.

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What is a good blower door test score?

According to The Pennsylvania Housing Research Center the following are basic guidelines for the ACH50 results: ACH50 less than 5.0 – Tight House. ACH50 between 5.0 and 10.0 – Moderate House.

How do I test my home efficiency?

Home Energy Audits: Testing Your Home’s Efficiency

  1. A blower door test measures the airtightness of the home. …
  2. Low-emissivity window checkers are handheld devices that are placed on the interior pane of a window to detect if a window has a low-emissivity coating. …
  3. Infrared, or IR, cameras take infrared images of a house.

How much does it cost for a blower door test?

The blower door test costs about $450.00 for a typical house. This includes a report of the air leakage locations and recommendations for the sealing approach. The report lists the sealing measures in a cost efficient priority.

How do you pass a blower test?

Passing Your Blower Door Test

  1. Have an airsealing plan BEFORE you start construction. …
  2. Make sure your sub-contractors are on board with the airsealing plan and are willing to seal all their penetrations. …
  3. Make sure all major penetrations are properly sealed. …
  4. Make sure you use Sill-Seal or caulk when installing exterior walls.


How do I prepare for a blower door test?

Easy Steps to Seal: How to Prepare for a Blower Door Test

  1. Step 1: Close all windows. Your windows must be closed to avoid outside air coming in through the opening and altering the blower door’s reading. …
  2. Step 2: Open all interior doors. …
  3. Step 3: Close all exterior doors. …
  4. Step 4: Turn off thermostats, air conditioners and fans. …
  5. Step 5: Prepare the fireplace.
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What is a home blower test?

Blower door tests are performed by certified energy auditors to determine to what degree a home is airtight. A temporary “blower door” equipped with a powerful fan is fitted into the frame of an existing front or back door, and when the fan is turned on, it sucks the air out of the house and blows it outside.

What is a good air leakage rating?

When looking at air leakage you should see ratings between 0.1 – 0.3. You are looking for the lowest number possible since that allows the least amount of air infiltration. A lower number means less air can pass through and fewer drafts.

How much does it cost to have an energy audit?

A home energy audit costs anywhere from $100 to $1,650 with an average of $415. Most homeowners spend between $207 and $673. You’ll spend anywhere from $0.08 to $0.50 per square foot with a minimum of $100 to $200.

What does ACH50 mean?

Air Change per Hour at 50 Pa (ACH50) is calculated by multiplying CFM50 by 60 to get air flow per hour, and dividing the result by the volume of the building. ACH50 tells us how many times per hour the entire volume of air in the building is replaced when the building envelope is subjected to a 50 Pascal pressure.

Why do we always use 50 Pascals for blower door tests on homes?

During construction. During the construction phase, when the airtight layer is still accessible, a simple one point depressurization test will give you a clear indication of how many air-changes per hour (ACH) are leaking out of the house at that given pressure (50 pascals). Blower door during construction.

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