6 Steam piping manifolds.
7 Steam traps.
9 Diagnostic devices for steam traps; steam system monitors.
11 Steam handling and distribution systems and parts for them; heaters and heating systems, including water heaters and heating systems, tank heaters and unit heaters; heat exchangers; refrigerating systems; ventilating systems; humidifiers, including steam humidifiers and electronic humidifiers; drainers, including drainers for discharging liquid from gas or liquid in pipes and drainers for discharging water from light liquid flowing through a pipe; purgers, including air purgers and purgers for discharging non-condensible gases from refrigeratiang systems; filters; strainers, including strainers for separating solids from liquid in pipes, basket strainers, and Y-strainers; separators; traps; vents, including vents for discharging air from steam and vents for discharging gas from liquid under pressure; ventilating systems; valves, including pressure-reducing valves and temperature-regulator valves; cooling coils, steam coils, steam traps; manifolds, condensate handling equipment.
37 Installation and maintenance of steam distribution systems and components thereof.
42 Consultation, engineering and management services in the field of steam generation and distribution systems and components thereof; performance contracting, energy audits, design and redesign of steam systems and related steam energy audits, design and redesign of steam systems and related steam and hydraulic equipment in commercial, institutional and industrial facilities.