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.

What is a good blower door test result?

A good rule of thumb is that your home should have a blower door number less than or equal to its square footage. Here are some things to know: a. If your home is 2000 square feet, a blower door number of 2000 cfm50 is decent (but not especially good).

What is a good ACH50?

Vermont’s residential energy code currently requires new houses to have an ACH50 of 3.0 or less. By comparison, many older houses we’ve tested have ACH50 numbers of 10 or more, and some have been much, much higher. Today’s high-performance houses typically have ACH50s closer to 1.0.

What is a good air tightness score?

A standard house has an air tightness test result of between 7 to 10 Air changes per hour. This means that on a windy day the air in your house changes from warm air to cold air up to 10 times in 1 hour.

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How do you read a blower door test?

There will be a reading for the house’s “ACH,” which stands for “Air Changes per Hour.” This indicates how many times the volume of air in your home would be completely replaced in one hour’s time if the blower fan continued to run. An ACH of “4” indicates a reasonably airtight home.

What does a blower door test tell you?

The 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.

How do you pass a blower door 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.


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.

How many air changes per hour should a home have?

ASHRAE (formerly called the American Society of Heating, Refrigerating and Air-Conditioning Engineers) recommends (in its Standard 62.2-2016, “Ventilation and Acceptable Indoor Air Quality in Residential Buildings”) that homes receive 0.35 air changes per hour but not less than 15 cubic feet of air per minute (cfm) per …

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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 can I improve my air tightness in my house?

Getting your building airtight to improve energy efficiency

  1. Getting your building airtight to improve energy efficiency.
  2. Build tight, ventilate right.
  3. Ventilation requirements.
  4. The importance of a “continuous air barrier”
  5. Educating and reviewing the work of subcontractors.
  6. Common leakage.
  7. Passing the air leakage test.

How do you check air tightness in a house?

The fan pulls air out of the house, lowering the air pressure inside. The higher outside air pressure then flows in through all unsealed cracks and openings. The auditors may use a smoke pencil to detect air leaks. These tests determine the air infiltration rate of a building.

What is considered a tight house?

A “tight” home relates to the overall size of all of the holes and penetrations in the exterior of the building envelope. Natural ventilation are the forces that drive air in or out through the leaks in the building envelope.

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 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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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.

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