本3-A认可惯例涵盖了用于在加工、包装和储存区域生产和处理工厂环境空气的设备的材料、设计、制造和安装。该3-A公认实践也为食品加工、包装和储存区域的空气质量保持提供了指导。这些条件被认为是将产品、产品接触面和开放容器的污染降至最低所必需的。已安装的暖通空调系统不适用于新建筑或已验收的暖通空调系统。 此3-A公认做法不适用于仓库区域、接收区域、冷却器和冷冻柜。

This 3-A Accepted Practice covers the materials, design, fabrication and installation of equipment used to produce and handle plant environmental air in processing, packaging, and storage areas.This 3-A Accepted Practice also provides guidance for the air quality to be maintained in food processing, packaging, and storage areas. These conditions are considered necessary to minimize contamination of product, product contact surfaces, and open containers.This 3-A Accepted Practice applies to HVAC systems installed in new building construction and does not apply to existing HVAC systems or minor renovation work.This 3-A Accepted Practice does not apply to warehouse areas, receiving areas, coolers and freezers.