ANSI Z21.12 : 1990
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
DRAFT HOODS
05-27-2020
01-01-2015
PART I - CONSTRUCTION
1.1 Scope
1.2 General
1.3 Inlet and Outlet Connections
1.4 Materials
1.5 Assembly
1.6 Installation Instructions
1.7 Marking
PART II - PERFORMANCE
2.1 General
2.2 Test Gases
2.3 Strength
2.4 Pilot Gas Venting Test
2.5 Draft Hood Operation
2.6 Marking Material Legibility Test
Exhibit A - Recommended Procedure for Safety Inspection
of an Existing Appliance Installation
Exhibit B - List of Reference Standards
PART III - MANUFACTURING AND PRODUCTION TESTS
PART IV - DEFINITIONS
APPENDIX - Table of Conversion Factors
LIST OF Z21 SERIES OF AMERICAN NATIONAL STANDARDS FOR
GAS APPLIANCES AND GAS APPLIANCE ACCESSORIES
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