This parameter measures the resistance to airflow created by the terminal device.
Air distribution systems are critical to maintaining thermal comfort and indoor air quality in modern buildings. At the heart of these systems are air outlets and inlets, commonly known as diffusers, grilles, and registers. To ensure these components perform as advertised by manufacturers, the industry relies on rigorous, standardized testing procedures.
Testing methods apply to both equal and varying temperature conditions. Where to Access Updated PDF Versions
The standard enforces rigorous, repeatable laboratory conditions to ensure manufacturer catalog data is accurate and comparable. ashrae standard 702006 pdf updated
Using air inlets and outlets rated under Standard 70 ensures real-world performance matches design intent. Indoor Environmental Quality (IEQ)
The 2023 edition covers a broader range of sizes and modern air-device types, including displacement ventilation underfloor outlets , which were less common when the 2006 version was written. Instrumentation Accuracy:
Details how to run tests under both isothermal and non-isothermal conditions. This parameter measures the resistance to airflow created
is the definitive engineering benchmark used to evaluate these components. This article provides an in-depth analysis of the standard, its testing parameters, its contemporary relevance, and how to navigate updates and PDF access. 1. Scope and Purpose of ASHRAE Standard 70-2006
ASHRAE standards are copyrighted and must be purchased from official distributors. The best approach is to search directly on the website ( www.ashrae.org ). The current official version of the 2006 document is identified as ANSI/ASHRAE Standard 70-2006 (RA 2021).
Determined to still be technically accurate and current without needing structural changes. To ensure these components perform as advertised by
: Basic testing is performed under isothermal conditions (where the supply air temperature matches the room air temperature) to isolate the physical air jet behavior from thermal buoyancy effects. Critical Metrics Derived from Standard 70
, though the 2023 version may require a purchase for full PDF download capabilities. testing procedures for displacement ventilation or details on the newly required instruments ASHRAE 70-2023
A significant update that refined testing methods for air inlets and outlets. Reaffirmation (RA 2011):