Micro Duct Liner NEP internal duct lining

Glass-wool board with a sprayed neoprene surface for lining ducts internally — absorbs duct noise, keeps duct temperature and controls condensation.

Thickness: 25–50 mm
Density: 32–48 kg/m³
Noise reduction coefficient (NRC): 0.70 / 0.85 / 0.75 / 1.05 NEP 3225 / 3250 / 4825 / 4850, Type A mounting · ASTM C423

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1. Choose the density

32 kg/m³48 kg/m³

2. Choose the thickness

25 mm50 mm

3. Choose the size, width × length

1.22 × 2.44 m

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See all models and sizes Manufacturer documents Technical specifications

Product details

Duct and HVAC insulationGlass wool (fibreglass)Microfiber

Glass-wool board, sprayed neoprene facing

Thickness: 25–50 mm
Density: 32–48 kg/m³
Noise reduction coefficient (NRC): 0.70 / 0.85 / 0.75 / 1.05 NEP 3225 / 3250 / 4825 / 4850, Type A mounting · ASTM C423
Thermal conductivity (λ): 0.033 / 0.032 W/m·K 32 / 48 kg/m³ at 24 °C

What is it?

Micro Duct Liner NEP from Microfiber is a glass-wool board with a sprayed neoprene surface, for lining cold and hot air ducts in buildings, offices, factories and homes. It absorbs noise carried along the duct and airflow noise, keeps the temperature and controls condensation. Densities 32 and 48 kg/m³; 25 and 50 mm thick.

What is it made of?

Glass wool (fibreglass) · Facing: Sprayed neoprene coating · Board

Which sizes are available?

Thickness 25–50 mm · 32–48 kg/m³ — Choose a size

Where does the data come from?

Micro Duct Liner datasheet (MI 04/12) · Micro Duct brochure (EX-BR-004, 2023)

Technical data from the manufacturer's documents Microfiber · Checked 12 Oct 2026

Technical specifications

All values come from the manufacturer's documents, with conditions and test standards. Values the documents do not state are not shown.

Property	Value	Conditions / standard	Source
Noise reduction coefficient (NRC)	0.70 / 0.85 / 0.75 / 1.05	NEP 3225 / 3250 / 4825 / 4850, Type A mounting · ASTM C423	Micro Duct Liner datasheet (MI 04/12), p. 2
Erosion test	No erosion at 25.4 m/s (5,000 fpm)	UL 181	Micro Duct Liner datasheet (MI 04/12), p. 1
Thermal conductivity (λ)	0.033 / 0.032 W/m·K	32 / 48 kg/m³ at 24 °C	Micro Duct brochure (EX-BR-004, 2023), p. 8
Standards / certification	TIS 486, 487 · ASTM · NFPA 90A · Australian Standards	—	Micro Duct Liner datasheet (MI 04/12), p. 1

Models and sizes available

Model	Thickness (mm)	Density (kg/m³)	Width (mm)	Length (mm)	R (m²·K/W)
NEP 3225	25	32	1220	2440	0.758
NEP 3250	50	32	1220	2440	1.515
NEP 4825	25	48	1220	2440	0.781
NEP 4850	50	48	1220	2440	1.563

Pack quantities and prices — ask us on LINE

Applications

Air-conditioning (HVAC)Ducts, refrigerant lines and HVAC noise

Highlights

NRC published for all four sizes
UL 181 erosion test
Two densities, two thicknesses

Manufacturer documents

Micro Duct Liner datasheet (MI 04/12)PDF · Microfiber Industries · TH

Micro Duct brochure (EX-BR-004, 2023)Reference document · ask us on LINE for the file

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Micro Duct Liner NEP internal duct lining

Choose model and size

Micro Duct Liner NEP 32 kg/m³ · 25 mm · 1.22 × 2.44 m

Micro Duct Liner NEP 32 kg/m³ · 50 mm · 1.22 × 2.44 m

Micro Duct Liner NEP 48 kg/m³ · 25 mm · 1.22 × 2.44 m

Micro Duct Liner NEP 48 kg/m³ · 50 mm · 1.22 × 2.44 m