Black Diffuser Board

Name: Black Diffuser Board
Brand: Knauf Insulation

Designed to bring an effective combination of efficient sound absorption, low thermal conductivity and minimal air surface friction. This board is made from fiberglass with an FSK bottom facing and black mat facing, giving the airstream a smooth, tough surface that resists damage during installation and operation.

Applications

Certifications

Product Features

Delivers excellent thermal insulation for heating, ventilating and air conditioning diffusers. Designed specifically for systems operating at temperatures up to 250° F.

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Noise Reduction

The black mat facing offers a smooth air surface for minimal friction. It provides sufficient acoustical insulation so it can stand up to velocities of up to 150mph.

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ECOSE® Technology

Our patented, bio-based binder is a smarter alternative to using phenol formaldehyde. It’s been foundational in our commitment to sustainability.

Product Details

Technical Data

Technical Data
Property (Unit)	Test	Performance
Corrosiveness	ASTM C665	Does not accelerate corrosion of steel
Odor Emission	ASTM C1304	Pass
Air Velocity	ASTM C1071	Max. 5,000 ft./min. (25.4 m/sec.)
Maximum Service Temperature	ASTM C411	250° F (121° C)
Mold Growth	ASTM C1338, ASTM G21, G22	Pass
Water Vapor Sorption (by weight)	ASTM C1104	3% or less
Surface Burning Characteristics (flame spread/smoke developed)	ASTM E84, UL 723, NFPA 90A and 90B	UL Classified FHC 25/50

Forms Available

Forms Available
Density	Thickness	Width	Length
3.0 PCF (48 kg/m³)	1" (25 mm)	48" (1,219 mm)	60" (1,524 mm)
			96" (2,438 mm)
			120" (3,048 mm)
	1⅜" (35 mm)		96" (2,438 mm)
	1⅞" (48 mm)		96" (2,438 mm)
	2" (51 mm)		60" (1,524 mm)
	2" (51 mm)		120" (3,048 mm)
4.0 PCF (64 kg/m³)	1" (25 mm)		96" (2,438 mm)
	1" (25 mm)		120" (3,048 mm)
	1⅜" (35 mm)		96" (2,438 mm)

Thermal Conductance "C" and Resistance "R"

Thermal Conductivity “C”¹ and Resistance “R”² \| ASTM C177
Mean Temperature 75° F (24° C)
Product		Conductance "C"	Resistance "R"
3.0 PCF (48 kg/m³)	1" (25 mm)	0.23 (1.31)	4.3 (0.76)
	1½" (38 mm)	0.15 (0.85)	6.5 (1.15)
	2" (51 mm)	0.11 (0.62)	8.7 (1.53)
“C Units” BTU ft2 ∙ hr ∙ ˚F W m2 ∙ ˚C “R Units” ft2 ∙ hr ∙ ˚F BTU m2 ∙ ˚C W

¹The lower the value, the better the performance. ²The higher the value, the better the performance.

Sound Absorption Coefficients

Sound Absoprtion Coefficients \| ASTM C423, Type A Mounting
Octave Band Center Frequency (cycles/sec.)
Product		125	250	500	1000	2000	4000	NRC
3.0 PCF (48 kg/m³)	1" (25 mm)	0.13	0.24	0.56	0.83	0.92	0.98	0.65
	1½" (38 mm)	0.19	0.41	0.89	1.02	1.03	1.04	0.85
	2" (51 mm)	0.33	0.67	1.07	1.07	1.03	1.06	0.95