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 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.
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).
How long does it take to do a blower door test?
How long does a blower door test take? It takes approx. 5-15 minutes to run the actual blower door test itself. It’s the prepping that takes the longest, about 1.5 hours on a standard home.
How do you pass a blower door test?
Passing Your Blower Door Test
- Have an airsealing plan BEFORE you start construction. …
- Make sure your sub-contractors are on board with the airsealing plan and are willing to seal all their penetrations. …
- Make sure all major penetrations are properly sealed.
What is a good air leakage result?
However, as a general rule new dwellings should achieve an Air Permeability of 5 m3h-1m-2 or less. A test between 3 – 5 m3h-1m-2 would usually be acceptable by building control and your SAP assessor. A reading of less than 3 m3h-1m-2 might mean the building is too airtight.
How do I test my home efficiency?
- A blower door test measures the airtightness of the home. …
- 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. …
- Infrared, or IR, cameras take infrared images of a house.
What is a good air tightness result?
A test result of between 3m3/hr/m2 and 5m3/hr/m2 is generally regarded as best practice for naturally ventilated dwellings while test results less than 3m3/hr/m2 are generally recommended for mechanically ventilated dwellings.
Do all new builds need an air test?
Building regulations states that: New build residential properties and those over a certain size (500 m2) must undergo air tightness testing before being sold. Small developments of one or two properties that are exactly the same must have one of the buildings undergo air tightness testing.
How can I test my home for air tightness?
The easiest way to measure house air tightness is with a diagnostic tool called a blower door. The blower door consists of a powerful, calibrated fan that is temporarily sealed into an exterior doorway. The fan blows air out of the house to create a slight pressure difference between inside and outside.