Preface
This is the third edition of CSA Standard A93 (now CAN3-A93) and has been retitled Natural Airflow Ventilators for Buildings. It supersedes previous editions published in 1961, 1964, and 1965. It is written in SI (metric) units.
This new edition has been expanded to include natural airflow ventilators for any building and to allow for the use of materials other than aluminum. The performance of the vent is reflected in requirements and methods of test. The formulae for computing the net ventilating area of a vent are included in the Appendices.
This Standard was prepared by the Technical Committee on Ventilators for Buildings under the jurisdiction of the Standards Steering Committee on Building Materials and Products, and was formally approved by these Committees. It has been approved as a National Standard of Canada by the Standards Council of Canada.
Scope
1.1
This Standard gives minimum requirements for ventilators designed to provide ventilation of building spaces by means of the natural flow of air.
1.2
This Standard includes physical, performance, and marking requirements. It also includes Appendices giving recommendations for installation of ventilators to ventilate building spaces and a guide for determining net ventilating area.
1.3
This Standard does not apply to mechanically operated ventilators or air turbine ventilators.
1.4 Reference Publication
This Standard refers to the following Publication and where such reference is made it shall be to the edition listed below, including all revisions published thereto:
ASTM* Standard
B117-73 (Reapproved 1979),
Salt Spray (Fog) Testing.
*American Society for Testing and Materials.
