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12 VAV-PRC011M-EN

Agency Certifications

There are numerous regulations and standards in the industry that determine the construction and

performance parameters for VAV terminal units. Some of the more important of those standards

and regulations are listed below, along with a brief description of what each one addresses.

American Society of Heating, Refrigerating and Air-conditioning

Engineers (ASHRAE)

ASHRAE - 41.1

ASHRAE - 41.2

ASHRAE - 41.3

These standards specify methods for temperature measurement (41.1), laboratory airflow

measurement (41.2), and pressure measurement (41.3). While none of these standards specifically

discusses VAV air terminals, they discuss topics that are aspects of terminal box systems.

Therefore, some engineers will include these standards in their specifications as a primer on

accepted measurement techniques.

ASHRAE - 62

This standard specifies the minimum ventilation rates and indoor air quality that are acceptable for

occupied spaces.

ASHRAE - 111

This standard calls out procedures to be followed for testing and balancing HVAC systems. It

includes descriptions of the equipment used, procedures followed, and field changes that must be

made when a system is balanced.

Air Conditioning and Refrigeration Institute (AHRI)

AHRI 880 - 2011

This standard sets forth classifications, performance testing requirements, and test results

reporting requirements for air terminal units. The standard contains very detailed procedures that

are to be followed for the testing and certification program associated with this standard. This is

one of the most commonly referenced standards in the VAV terminal unit industry. The AHRI-880

certification program is designed to police the accuracy of documented performance for terminal

units. The certification program requires a sampling of at least four units be tested annually. The

tested units are chosen at random by AHRI and sent to an independent laboratory for the testing.

The performance is tested at one specific operating condition. The operating characteristics tested

include discharge and radiated sound power (for the damper and, in the case of fan-powered

boxes, the fan), wide-open damper pressure drop, and fan motor amp draw. VariTrane terminal

units are certified according to AHRI-880.

AHRI 885-2008

This document provides a procedure to estimate sound pressure levels in an occupied space. The

standard accounts for the amount of sound pressure in the space due to the VAV air terminal,

diffusers and their connecting low pressure ductwork. While sound generated from the central

system fan and ductwork may be a significant factor in determining the sound pressure level in the

room, this standard does not address those factors. It focuses solely on the VAV terminal and items

downstream of it. This standard is related to AHRI-880 by using sound power determined using

AHRI-880 methodology as a starting point for the AHRI-885 procedure.

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