Air Conditioning and Heat Transfer Products

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Staff Contact: Lauren Zelinski

Related Standards

Related Standard 1350
Standard 1350 Scope
This standard applies to the enclosure which houses the fans, coils, filters, and other components of the Central Station Air-handling Unit (CSAHU). This standard establishes the test requirements, rating requirements, and minimum data requirements for Casing Deflection Rating Class, Casing Air Leakage Class, Thermal Transmittance Class with Leakage, Thermal Transmittance Class without Leakage, and Thermal Bridging Class.
Related Standard 1351
Standard 1351 Scope
This standard applies to the enclosure which houses the fans, coils, filters, and other components of the Central Station Air-handling Unit (CSAHU). This standard establishes the test requirements, rating requirements, and minimum data requirements for Casing Deflection Rating Class, Casing Air Leakage Class, Thermal Transmittance Class with Leakage, Thermal Transmittance Class without Leakage, and Thermal Bridging Class.
Related Standard 430
Standard 430 Scope
This standard applies to a factory-made encased assembly consisting of a supply fan or fans in parallel which may also include other necessary equipment to perform one or more of the functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying and mixing of air and which does not contain a source of mechanical cooling. The CSAHU must have a maximum design external static pressure (ESP) greater than 1.0 inches [250 Pa]. This standard establishes the test requirements, rating requirements, and minimum data requirements for Fan Speed and Shaft Power.
Related Standard 431
Standard 431 Scope
This standard applies to a factory-made encased assembly consisting of a supply fan or fans in parallel which may also include other necessary equipment to perform one or more of the functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying and mixing of air and which does not contain a source of mechanical cooling. The CSAHU must have a maximum design external static pressure (ESP) greater than 1.0 inches [250 Pa]. This standard establishes the test requirements, rating requirements, and minimum data requirements for Fan Speed and Shaft Power.
Related Standard 410
Standard 410 Scope
This standard establishes a single set of testing and rating requirements for determining capacities, air side frictions, and tube side frictions of forced-circulation air-cooling and air-heating coils; whereby, equipment performance ratings can be compared from product to product.
Related Standard 440
Standard 440 Scope
This standard establishes a single set of requirement for the testing and rating of total cooling capacity, sensible cooling capacity, and power input for room fan-coil air-conditioners and unit ventilators; whereby, equipment performance ratings can be compared from product to product.
Related Standard 840
Standard 840 Scope
This standard establishes a single set of requirements for the testing and rating of cooling and heating capacities, power input, efficiency, standard air flow, fluid flow, and pressure drop for unit ventilators; whereby, equipment performance ratings can be compared from product to product.
Related Standard 841
Standard 841 Scope
This standard establishes a single set of requirements for the testing and rating of cooling and heating capacities, power input, efficiency, standard air flow, fluid flow, and pressure drop for unit ventilators; whereby, equipment performance ratings can be compared from product to product.


Section Scope

Heat transfer devices of the types generally used in mechanical air conditioning, as outlined in the subsection scopes following:

Air Heating and Cooling Coils Subsection:

Scope: Central system finned cooling and heating coils, air conditioning type, not a part of a matched split system as covered by the Unitary Small Equipment Section, and intended for field installation, and for central station air conditioning units used with but not including means for air circulation.

  • Standard steam.
  • Steam distributing tube type.
  • Hot water heating.
  • Standard water cooling and/or heating.
  • Cleanable tube water.
  • Volatile refrigerant cooling.
  • Liquids as specified from time to time by the subsection.

Wetted surface dehumidifiers, consisting of a suitable enclosure containing cooling coils, means for liquid spray over the cooling coils, and tank, but without means for air circulation provided as an integral part of the unit. The unit may include a recirculating water pump, eliminator plates, and inlet deflectors.

Central Station Air Handling Units Subsection:

Scope: Factory-made encased assemblies consisting of a fan or fans in parallel which may also include other necessary equipment to perform one or more of the functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying, and mixing of air and that have a maximum design external static pressure greater than 1.0 in H2O. It does not include units that have a source of mechanical cooling or that have direct expansion coils which are incorporated by the manufacturer in a matched split system air conditioner or as otherwise defined in the product scope definition of other AHRI product sections.

Room Fan Coil Units Subsection:

Scope: Factory-made encased assemblies consisting of a fan or fans in parallel which may also include other necessary equipment to perform one or more of the functions of circulating, cleaning, heating, cooling, humidifying, dehumidifying, and mixing of air and that generally have a maximum design external static pressure less than or equal to 1.0 in H2O. It does not include units that have a source of mechanical cooling or that have direct expansion coils which are incorporated by the manufacturer in a matched split system air conditioner or as otherwise defined in the product scope definition of other AHRI product sections.

Unit Ventilators Subsection:

Scope: Factory-made unit ventilators for all applications and sizes. A unit ventilator is an institutional type assembly, equipped with ventilation and return air dampers capable of introducing ventilation air of at least 80% of rated standard air flow, while also providing the functions of circulating or heating, heating or cooling and filtering air. The source of humidity control, heating or cooling supplementary to that from ventilation air, may be remote of an integral part of the unit itself. This equipment is designed for free delivery of air into a room but may be applied with minimal duct work having a static resistance normally not exceeding 0.50 inches water column. This equipment is provided with air capacities of 3000 cfm or less. Excluded are individual assemblies such as a cooling or heating section for separate use, and the following equipment:

  1. Room air-conditioners as defined in AHAM standard RAC-1.
  2. Room fan-coil and air induction units as defined in ARI standards 440 and 445.
  3. Packaged terminal air-conditioners and heat pumps as defined in ARI standard 310/380.
  4. Central-station air handling units as defined in ARI standard 430.