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ADC TEST STANDARDS
6.3 Material Characteristics
There are specifications external to this standard based on specific properties of component materials. When required, data should be determined and reported in accordance with the following procedure.
6.3.1 Permeance
Water vapor permeance of the jacketing material is applicable only to insulated flexible duct. Permeance shall be tested and reported in accordance with Section 6.4.1
6.3.2 Dimensions and Tolerances
Dimensions and tolerances of flexible ducts shall be within the tolerance listed on the manufacturer ’ s data sheets. Length shall not be less than advertised nominal when measured fully extended in accordance with Section 6.4.2
6.3.3 Sampling
Unless otherwise stated in the purchase document, quality records maintained by the manufacturer will suffice in the relationship between the purchaser and manufacturer. If they mutually agree to accept lots based on the quality control records, no further sampling is required.
6.4 Methods of Test
6.4.1 Water Vapor Transmission Rates of Vapor Barriers
The water vapor transmission rate of the vapor barriers shall be determined in accordance with either ASTM E96 Procedure A or ASTM F1249. Specimens for test shall be selected in the following manner. A sample of flexible duct shall be selected from production material which has been stored in its standard package a minimum of twenty - four (24) hours. Specimens 12 in. x 12 in. [300mm x 300mm] shall be cut from each at the approximate center of the sample duct.
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WVTR specimens will then be prepared and tested in accordance with the procedures outlined in either ASTM E96 Procedure A or ASTM F1249.
The permeance of the material shall be reported as the average of three determinations tested. The results are to be reported in U.S. perms [ng/s • m 2 • Pa)].
6.4.2 Length Measurement
A length of flexible duct which has been packaged in compressed form shall be measured with a tape after fully extending the duct. Measure while maintaining the tension.
For reference measurement: Apply an axial load of 25 lbs. [11.3 Kg], measured by a force gauge, to the product for one minute. Measure the length with the axial tension applied after the duct is fully extended.
6.5 Product Marking
6.5.1 Listing Mark and Label Information
All ducts shall be marked, labeled or printed at a maximum interval of 10 ft. [3.0m] or a fraction thereof. Labels shall contain at least the following information.
• •
Identifying mark of the listing agency
Manufacturer ’ s identification
• Maximum Positive and Negative Pressure Rating • Maximum Rated Velocity • R - Value (applicable to insulated ducts only) • Classification of Surface Burning Characteristics (Class 0 or 1) • Identification as either an Air Duct or Air Connector
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