Definitions
A pressure-actuated valve held closed by a spring or other means & designed to relieve pressure automatically in excess of the device's settings.
Pressure Relief Valve
Has an exhaust rate capacity of 100CFM intermittent or 25 CFM continuous
Kitchen Exhaust
Design temperature of air to be conveyed in this duct shall be less than 250 degrees.
Flex Duct
Chemical Refrigerant R-744
Carbon Dioxide
Appliances shall not be installed in a location where subject to this unless protected by approved barriers.
Mechanical Damage
A type of boiler furnishing steam at pressures not exceeding 15 psi
Low-Pressure Steam-Heating Boiler
These shall not be within 10 feet horizontally from any hazardous or noxious contaminant source (such as vents, streets, alleys, parking lots, and loading docks).
Intake Openings
The use of these boards to form plenums shall be limited to systems where the air temps do not exceed 125 degrees.
Gypsum Boards
Used refrigerants that shall not be reused in a different owner's equipment or appliances unless tested & found to meet the purity requirements of AHRI 700.
Reclaimed Refrigerants
Required in every boiler and modular boiler in the supply and return piping.
Shutoff Valve
This class of this liquid have a closed cup flash point at or above 100 degrees and below 140 degrees.
Class II Combustible Liquid
Swimming Pool
These metallic ducts not having an approved protective coating shall be completely encased in not less than 2 inches of concrete.
Underground ducts
Refrigeration systems with this refrigerant shall comply with IIAR 2, IIAR 3, IIAR 4, and IIAR 5.
Ammonia
For protection of the structure, the diameter of these shall not exceed 40% of the stud depth.
Bored holes in wood studs
An air intake device used to capture by entrapment, impingement, adhesion or similar means grease, moisture, heat, and similar contaminants before they enter a duct system
Hood or Kitchen Hood.
This type of dryer's ducts shall have a minimum clearance of 6 inches to combustible material.
Commerical clothes dryer
Liquid adhesive coating
These rooms are not required for listed equipment & appliances containing more than 6.6 pounds of refrigerant, regardless of the refrigerant's safety classification.
Machinery Room
These shall be tested hydrostatically at one and one-half times the maximum system design pressure, but not less than 100psi.
Hydronic Piping Systems
An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors or floors and the roof.
Shaft
Where these specified motors are required, their bearings shall not be within the airstream and all their parts shall be grounded
Spark Resistant fans
Smoke detectors shall be installed in these systems with a design capacity greater than 2000 CFM.
Return Air System
A clearly identified switch of the break-glass type or with an approved tamper-resistant cover shall provide off only control of refrigerant compressors, pumps, and normally closed automatic valves located in the machinery room.
Refrigeration System Emergency Shut Off
Where vents pass through insulated assemblies, this will be constructed of no less than No. 26 gauge sheet metal shall be installed to provide clearance between the vent and the insulation material.
Insulation Shield