This is often referred to as uncontrolled ventilation.
Air permeability test procedure for fabric.
1 first of all open the specimen clamp j.
The whole testing procedure gets completed in below steps.
Place the specimen on the specimen fixing plate i.
Read and record the individual test results in si units or in.
How the test works.
Air permeability tester is the common used to measure it.
Air permeability tester of textile fabrics complies with astm d737 iso 9237 7231 bs 5636 etc.
The volume of air passed per second through per unit area of the fabric is called air permeability of fabric.
A circle of fabric is clamped into the tester and through the use of a vaccum the air pressire is made.
Air tightness also known as air leakage air infiltration or air permeability testing is a quick non invasive procedure put in place to measure the total air lost through leaks in the building fabric.
It is used to test the resistance of the flow of air through fabrics.
Fabric air permeability is a nature of air passing through fabric normally under the situation that two sides of fabric exist pressure difference that is to say it is speed that airflow vertically goes through fabric in a prescribed test area pressure drop and time whose unit is mm s or m s.
According to these test methods the airflow through a given area of fabric is measured at a constant pressure drop across the fabric.
Fabric air permeability test.
When you do air permeability testing for fabric there is different air permeability test method.
Air permeability testing apparatus circular test head with a test area of 5 93 square inches 15 07 cm.
Now tighten the specimen clamp securely.