HG/T 20711-2019Code for design of heating, ventilation and air conditioning of chemical laboratories and testing rooms (English PDF)

1 Scope

This standard specifies: the classification of laboratories and laboratories; the following provisions are made for various laboratories and laboratories: 1.

Selection of indoor and outdoor design parameters; 2.

Design requirements and regulations for heating, ventilation and air conditioning 3.

Foreword

This document was issued on 2 August 2019 by the Ministry of Industry and Information Technology of the People's Republic of China, and has been in force since 1 January 2020.

It is the first edition of this standard.

The document is under the responsibility of the Ministry of Industry and Information Technology.

About this edition

HG/T 20711-2019 is the first edition of this standard. It was issued on 2 August 2019 and has been in force since 1 January 2020.

There is no earlier edition to compare it with, so a specification that has to refer to this subject can only cite HG/T 20711-2019 itself.

The interval between issue and effect is the transition period. It exists so that producers, laboratories and buyers can requalify products, revise procedures and use up documentation before the new text becomes the one that applies. The date on this page is the official one announced by the Ministry of Industry and Information Technology of the People's Republic of China.

Edition history and citation

HG/T 20711-2019 is a first edition: there is no earlier version of this standard, so a document that needs to refer to this subject can only cite HG/T 20711-2019 itself.

Where an edition is replaced, the Chinese standardization system keeps the number and changes the year: the number identifies the subject, the year identifies the text. That is why a citation without a year is ambiguous and a citation with one is not.

Classification and status

HG/T 20711-2019 carries no ICS number in the official record.

The HG/T prefix marks a recommended standard of China's chemical industry, issued by the Ministry of Industry and Information Technology. It is not, in itself, law: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it.

The document is under the responsibility of the Ministry of Industry and Information Technology, which is the body that maintains it and that will answer a formal question about its interpretation.

How this standard is designated

The full designation is HG/T 20711-2019. A citation should carry the number with its year, because the year identifies the text that applies.