The instrument is designed based on the principles of the local standard of Guangdong Province “Test Method for Air Permeability of Mattresses” (DB44/T) and relevant national standards (GB/T 6529, QB/T 1952.2).

The core idea is: under the specified air volume conditions, the time required for air flow to pass through the given area of the sample is measured to characterize the air permeability.

Air permeability refers to the quantitative performance of air passing through the mattress or mattress materials. It is represented by the duration of air flow passing through the sample under the specified experimental area, pressure drop, and time conditions – the shorter the permeation time, the better the permeability of the sample.

According to the standard method, three test points are selected for each mattress: the intersection point of the centerline in the length direction and the centerline in the width direction of the mattress is the first test point; at 600 mm away from the edge of the width direction at both ends and parallel to the width direction, the two lines and the two intersection points with the centerline in the length direction are the other two test points. A total of three points are measured, and the average value is taken as the result to ensure the data is representative.