Atmosphere® Air Duct Board

This duct board provides excellent thermal and acoustic performance that minimize unwanted sounds and allow for quiet, efficient air delivery. Atmosphere® Air Duct Board is formaldehyde-free, and has a lightweight non-woven brown airstream surface mat made with ECOSE® Technology.

Applications

HVAC

Certifications

Product Features

Built To Perform

Atmosphere® Air Duct Board is designed for high thermal and acoustical performance. It reduces the noise generated by air turbulence and mechanical equipment, while helping to maintain temperature.

Sustainable

As part of our commitment to sustainability, this formaldehyde-free insulation uses our patented bio-based binder.

Versatile

Fabrication is simple and streamlined. Multiple sizes are available, there are minimal capital requirements, and only one trade is needed 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	1" (25 mm)	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
EI-800	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"
Internal Pressure Inches of Water	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])

All Product Resources

UL Environmental Claim Validation - Formaldehyde Free - Atmosphere Air Duct Board

GREENGUARD Gold -Atmosphere Air Duct Board

Safety Data Sheet - Atmosphere Air Duct Board

UL Environmental Claim Validation - Recycled Content - Atmosphere Air Duct Board

UL Environmental Claim Validation - Mold Resistance - Atmosphere Air Duct Board

Submittal Sheet - Atmosphere Air Duct Board

Need Product Support?

Contact customer service for to get help with this product, including specs, installation guidance and more.

Contact Customer Service

Related Products

AK Board™

This thermal and acoustical insulation is made from inorganic glass fibers preformed into boards bonded by a thermosetting resin, and is a versatile choice for a variety of applications.

Applications

HVAC, Sound Control

Thickness

1" – 4"

Width

24"; 48"

Length

36" – 120"

View Product

Akousti-Liner™

This flexible duct liner provides both thermal and acoustical insulation, and is made from inorganic glass fibers bonded by a thermosetting binder. Akousti-Liner is used extensively in ductwork.

Applications

HVAC, Sound Control

Thickness

0.5" – 2"

Length

50' – 100'

Density

1.5 PCF; 2.0 PCF

View Product

Akousti-Liner R™

This rigid board duct liner provides both thermal and acoustical insulation, and is made from inorganic glass fibers bonded by a thermosetting binder. Akousti-Liner R is used extensively in ductwork, ventilation, and air conditioning systems.

Applications

HVAC, Sound Control

Thickness

1" – 2"

Length

48" – 96"

Width

24"; 48"

View Product

Alley Wrap™ B

This fiberglass blanket provides both thermal and acoustical insulation, and is made from highly resilient inorganic glass fibers bonded by a thermosetting binder. It’s available unfaced, or with either and FSK or PSK jacket, and is commonly used for ductwork.

Applications

HVAC, Sound Control

Thickness

1.5" – 2"

Width

Length

50' – 100'

View Product

Eclipse® Air Duct Board

This duct board offers quiet, efficient air delivery with its excellent thermal and acoustic characteristics. It is made with a foil-scrim-kraft vapor retarder, and a lightweight, non-woven black mat for the airstream surface.

Applications

Thickness

1"; 1.5"; 2"

R-Value

4.3; 6.5; 8.7

Stiffness

EI-475; EI-800

View Product

How Can We Help?

Our team of specialists are ready to answer your questions and help you choose the right product for your next project.