Excellent acoustic and thermal characteristics make for quiet, efficient air delivery. Unwanted “booms” and “cracks” caused by sheet metal ducts, minimized. This formaldehyde-free board with a lightweight non-woven brown mat on the airstream surface is made with ECOSE® Technology.

Applications

Certifications
Product Features
Proven Performance
Engineered for high thermal and acoustical performance. Helps maintain temperatures and reduce noise generated by air turbulence and mechanical equipment.
ECOSE® Technology
Our patented, bio-based binder is a smarter alternative to using phenol formaldehyde. It’s been foundational in our commitment to sustainability. For the world we live in.
Versatile Fabrication
Simple, streamlined fabrication — done in shop or on the job site. Multiple sizes, minimal capital requirements and only one trade is required to fabricate and install.
Product Details
Technical Data
Technical Data
Property (Unit) Test Performance
Corrosiveness ASTM C665 Does not accelerate corrosion of steel (Insulation)
Corrosion ASTM C1617 Pass (Insulation)
Maximum Service Temperature ASTM C411 250° F (121° C) (Insulation)
Wator Vapor Permeance ASTM E96, Procedure A 0.02 perms or less
Water Vapor Sorption (by weight) ASTM C1104 Less than 5%
Flexural Rigidity NAIMA AHS-100-74
Available in 2 stiffness values: El-475 and El-800; Flexural rigidity (El) is the product of Young's modulus of elasticity (E) and moment of inertia (I)
Air Velocity UL 181 Max. 5,000 ft./min. (1,524 m/min.) Tested to 12,500 ft./min. (3,810 m/min.)
Internal Static Pressure UL 181 Maximum ±2" water (498 pascals [Pa])
Microbial Growth ASTM C1338, ASTM G21, UL 181 Pass, does not support the growth of fungi or bacteria
Surface Burning Characteristics (flame spread/smoke developed) ASTM E84, UL 723 FHC 25/50; UL Listed
Forms Available
Forms Available
Type Size* Edge Pieces/Carton**
EI-475 1" (25 mm) 48" x 96" (1219 mm x 2438 mm) Shiplap 8
EI-800 48" x 120" (1219 mm x 3048 mm) Butt, Shiplap 6
EI-800 1.5" (38 mm) 48" x 120" (1219 mm x 3048 mm) Shiplap 4
2" (51 mm) 48" x 120" (1219 mm x 3048 mm) Butt, Shiplap 3

*Other lengths available on custom order basis. **Palletized packaging available on request.
Thermal Resistance R & Thermal Conductivity K
Thermal Resistance R | ASTM C518 Mean Temperature 75° F (24° C)
Thickness R-Value (R.S.I)
1" (25 mm) 4.3 (0.76)
1.5" (38 mm) 6.5 (1.14)
2" (51 mm) 8.7 (1.53)
“R” Units ft2 ∙  hr  ∙ ˚F BTU m2 ∙ ˚C W)
Thermal Conductivity K | ASTM C177 Mean Temperature 75° F (24° C)
  K-Value
EI-475 and EI-800 0.23 (.033)
“k” Units BTU ∙ in ft2 ∙  hr  ∙ ˚F W m2 ∙ ˚C)
Sound Absorption Coefficients
Sound Absorption Coefficients | ASTM C423, Type A Mounting
Octave Band Center Frequency (Cycles/Sec.)
Thickness 125 250 500 1000 2000 4000 NRC
1" (25 mm) 0.03 0.25 0.62 0.92 1.03 0.97 0.70
1.5" (38 mm) 0.02 0.44 0.96 1.17 1.16 1.12 0.95
2" (51 mm) 0.19 0.64 1.08 1.13 1.06 1.06 1.00
Friction Loss & Recommended Maximum Duct Dimensions Without Reinforcement
Friction Loss
Ft./min. Hydraulic Diameter
Velocity 10" 16" 24" 32" 40" 72" 100"
500 0.056 0.031 0.018 0.012 0.009 0.005 0.003
600 0.077 0.042 0.025 0.018 0.013 0.007 0.004
700 1.04 0.57 0.034 0.24 0.018 0.009 0.006
800 0.134 0.074 0.044 0.031 0.023 0.011 0.008
900 0.169 0.093 0.056 0.039 0.029 0.014 0.010
1000 0.207 0.114 0.068 0.048 0.036 0.018 0.012
2000 0.806 0.443 0.266 0.186 0.141 0.069 0.046
3000 1.797 0.988 0.594 0.415 0.315 0.153 0.103
4000 3.179 1.748 1.050 0.734 0.557 0.271 0.181
5000 4.952 2.724 1.636 1.143 0.867 0.422 0.283
 
Recommended Maximum Duct Dimensions Without Reinforcement*
Internal Pressure
Inches of Water
EI-475-1" EI-800-1", 1½", 2" 13⁄16"
0.5 (125) 1.0 (249) 2.0 (498) 0.5 (125) 1.0 (249) 2.0 (498) 0.5 (125) 1.0 (249)
Positive 36" (914 mm) 24" (610 mm) 15" (381 mm) 36" (914 mm) 24" (610 mm) 18" (457 mm) 22" (558 mm)
Negative 34" (864 mm) 24" (610 mm) 14" (356 mm) 36" (914 mm) 24" (610 mm) 18" (457 mm) 22" (558 mm)

*This table summarizes span/pressure limitations for unreinforced duct. For larger ducts, refer to NAIMA’s “Fibrous Glass Duct Construction Standard,” or Knauf Insulation's Air Duct Fabrication Manual. (Pressure—Pascals [Pa])
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