Corrosiveness

Fibrous glass duct liner shall not corrode stainless steel, copper, or aluminum in contact with duct liner to an extent greater than sterile cotton.

Temperature resistance

The air stream surface shall have no evidence of flaming, glowing, smoldering, visible smoke, or delamination, cracking, deformation or reduction in thickness at minimum service temperature of 250˚F (121˚C).

Erosion resistance

The insulation shall not break away, flake off, or show evidence of delamination or continued erosion when air is passed through sections at 21/2 times rated air velocity.

Odor emission

The insulation shall have no detectable odor of objectionable nature as determined by an odor panel.

Moisture vapor sorption

Moisture vapor sorption shall not exceed 3% by weight.

Installation

Fibrous glass duct liner insulations are applied to interior surfaces using adhesives complying with the property requirements of ASTM C 916, Standard Specification for
Adhesives for Duct Thermal Insulation, plus mechanical fasteners designed specifically for this purpose, spaced as shown in Figure 16. All joints and seams in the sheet
metal ductwork should be tightly sealed. Corner joints are made as shown in Figures 17a, 17b, 17c.