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 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 is a good air tightness test result?
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. This could lead to condensation and mould, and therefore would need to be accompanied by an adequate ventilation system.
How do you pass a blower test?
7 Tips & Tricks for Blower Door and Duct Leakage Testing
- Don’t do the blower door test first. …
- Put the hose outside. …
- Put the hose in a bag, can, or shoe. …
- Put newspaper over fireplace ashes. …
- Make sure your helpers know where to seal the vents. …
- Use Vent Caps. …
- Remember the science.
Are blower door tests required?
The most common use of a blower door test is as a part of code compliance testing in new home construction. Because the air leakage is so important, this test is required by building code. … So if your home is super leaky, it was probably thrown together and shows that a lot of care wasn’t put into the details.
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 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.
When should air tightness test be done?
When is Air Tightness Testing Required? An air tightness test is completed towards the end of the construction process, in order to meet Building Regulations/Standards. The results of the test are used within SAP and SBEM calculations, and can influence a new buildings overall energy rating.
How do you increase air tightness in an existing house?
Getting your building airtight to improve energy efficiency
- Getting your building airtight to improve energy efficiency.
- Build tight, ventilate right.
- Ventilation requirements.
- The importance of a “continuous air barrier”
- Educating and reviewing the work of subcontractors.
- Common leakage.
- Passing the air leakage test.
How tight should my house be?
When a House Is Too Tight
In an energy-efficient home, that number should fall below 0.50 ACH. However, building guidelines suggest a minimum 0.35 ACH, regardless of whether the air enters the home through fans or is a result of natural air leaks.