UL 1738
Standard for Venting Systems for Gas-Burning Appliances, Categories II, III, and IV

DETAILS
Edition Number:3SCC Approved:--
Edition Date:2010-10-04DOD Approved: --
Price Code:BANSI Approved: 2014-11-07
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover venting systems intended for venting Category II, III, or IV gas-burning appliances as defined by the Standard for Gas-Fired Central Furnaces (except Direct-Vent Central Furnaces), ANSI Z21.47 and the National Fuel Gas Code, NFPA 54. Venting systems covered by these requirements are intended to be used with Category II, III, and IV appliances that have been installed in accordance with NFPA 54, and with codes such as the BOCA National Mechanical Code, the Standard Mechanical Code, the Uniform Mechanical Code, and local codes.

    1.2 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Units of Measurement
          • 3 Glossary
          • 4 Undated References
          • 5 Components
        • CONSTRUCTION
          • 6 Materials
          • 7 Assembly
          • 8 Joints
          • 9 Firestop Spacers
          • 10 Thimbles
          • 11 Support Assembly
          • 12 Radiation Shields
          • 13 Vent Termination or Caps
          • 14 Drain Fittings
          • 15 Appliance Adapters
        • PERFORMANCE
          • 16 General
          • 17 Test Installations
          • 18 Temperature Measurement
            • 18.1 Thermocouples
            • 18.2 Vent gas temperatures
            • 18.3 Other temperatures
          • 19 Temperature Test – Structure
          • 20 Draft Loss, Wind Effects and Induced Updraft Tests
            • 20.1 Draft loss test
            • 20.2 Wind effects tests
            • 20.3 Induced updraft test
          • 21 Vertical Support Test
          • 22 Strength Tests
            • 22.1 Impact test
            • 22.2 Longitudinal force test
            • 22.3 Load test for vent elbows
            • 22.4 Vent joint load test
          • 23 Wind Load Test
            • 23.1 Test on roof assemblies
            • 23.2 Test on lateral supports
          • 24 Rain Test
          • 25 Freezing and Thawing Test for Water-Absorptive Nonmetallic (Cementitious) Materials
          • 26 Cemented Joint Test for Metallic Vent Gas Conduit
          • 27 Condensate Exposure Test for Porcelain-Coated Steel Used for Vent Gas Conduit
          • 28 Vent Sag Test for Horizontal Installations
          • 29 Puncture Test
          • 30 Bending Test
          • 31 Torsion Test
          • 32 Pressure Test
          • 33 Leakage Test
          • 34 Joint Sealing Compound Test
          • 35 Joint Tightness Test
          • 36 Strength Test for Joining Non-Metallic Vent Systems
          • 37 Low-Temperature Handling Test (Non-Metallic Venting Systems)
          • 38 Water Absorption Test
          • 39 Resistance to Condensate-Exposure Corrosion Test for Metals
          • 40 Polymeric Materials – Conditioning for Physical Properties Tests
            • 40.1 General
            • 40.2 Elevated temperature conditioning
            • 40.3 Light and water conditioning
            • 40.4 Condensate conditioning
          • 41 High Acid Conditioning Test
          • 42 Polymeric Materials – Physical Properties Tests
            • 42.1 General
            • 42.2 Tensile strength
            • 42.3 Impact
            • 42.4 Pipe deflection (crush) resistance and stiffness
            • 42.5 Flammability
          • 43 Deflection Temperature of Polymeric Materials Under Load Test
          • 44 Internal Stress Test
        • MARKING
          • 45 General
          • 46 Permanency of Marking
            • 46.1 General
            • 46.2 Air oven-aging test
            • 46.3 Humidity test
            • 46.4 Unusual-condition exposure test
            • 46.5 Adhesives - joint sealant applications
        • INSTRUCTIONS
          • 47 Installation and Maintenance Instructions
        • MANUFACTURING AND PRODUCTION TESTS
          • 48 General
          • 49 Longitudinal Force and Torque Test
          • 50 Internal Stress Test
    • APPENDIX A