National Mechanical Standards

The design, installation, maintenance, alteration and inspection of mechanical systems, including heating systems, ventilating systems, cooling systems, steam and hot water heating systems, water heaters, process piping, boilers and pressure vessels, appliances utilizing gas, liquid or solid...

This document defines terms on balancing. It complements ISO 2041, which is a general vocabulary on mechanical vibration and shock.

Suspended Ceiling Power Grid Systems and Equipment UL 2577 1.1 These requirements cover suspended ceiling grid low voltage/extra-low voltage systems and equipment intended for installation and use in accordance with the: In Canada: Canadian Electrical Code, Part I, Safety Standard for Electrical...

Fireplace Accessories UL 907 1.1 These requirements apply to fireplace accessories that are intended only for field installation into or attachment to existing masonry fireplaces. Fireplace accessories include items such as heat exchangers, glass door assemblies, and the like. For the purpose of...

Organic Light Emitting Diode (OLED) Panels UL 8752 1.1 These requirements apply to organic lighting emitting diode (OLED) panels intended for task, ambient, or aesthetic illumination, and for portable or permanent installation in accordance with the following standards, and for connection to...

This part of ISO 21940 specifies the requirements for the following: a) identifying errors in the unbalance measuring process of a rotor; b) assessing the identified errors; c) taking the errors into account. This part of ISO 21940 specifies balance acceptance criteria, in terms of residual...

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...