Devices to prevent pollution by backflow of potable water. Unrestricted air gap. Family A. Type A Ingestion-build-73935 5 Determination of squareness

5 Determination of squareness

A theory is presented to define additional performance parameters for confirmatory tests

Method by sieving and sedimentation

and non-end load-bearing elbows

Devices to prevent pollution by backflow of potable water. Unrestricted air gap. Family A. Type A Ingestion-build-73935 5 Determination of squareness1 Scope This European standard specifies the characteristics and the requirements of unrestricted air gaps Family A Type A intended for protection of potable water in water installations from pollution. This standard applies to air gaps in factory assembled products and to constructed air gaps in situ, and defines the physico chemical characteristics of materials of construction used for the purpose and application to ensure compliance with this