Noise Curtains

by dB Engineering

Acoustical Pipe & Duct Lagging

dB Engineering Lag Series combines a loaded vinyl noise barrier with a fibrous glass scrim reinforced aluminum foil facing on one side

The dB Engineering Lag Series combines a loaded vinyl noise barrier with a fibrous glass scrim reinforced aluminum foil facing on one side.  B-10 LAG is commonly used for wrapping noisy iron, steel, and plastic pipe, ducts, valves, and heat exchangers in a wide variety of indoor and outdoor applications.   The entire series has excellent corrosion and outdoor weathering resistance, high strength and excellent conformability.  The reinforced foil facing readily accepts a matching tape for quick and easy installation. 

B-10 LAG

B-10 LAG is available in combination with a nominal one-inch thick (B-10 LAG/QFA-3) or two-inch thick (B-10 LAG/QFA-9) quilted fiberglass decoupler to form a tight fitting "floating" noise barrier.  The quilt decouples the loaded vinyl barrier from the noise emitting surface achieving greater noise reductions.   The one-step installation of decoupler, barrier, and outer jacket offers substantially lower installation costs. The composite combination is also designed to provide thermal insulation to reduce energy consumption.

Barrier Backed composite, a reinforced loaded vinyl noise barrier with a quilted fiberglass absorber on one side

Barrier Backed composite

BBC composite products were used to wrap a pipe at a waste water treatment facility (shown to the right), resulting in a 15 db reduction in noise.

Barrier Backed composite


Barrier Backed composite Barrier Backed composite
Acoustical Data:
Products Sound Transmission Loss (dB) Frequency (Hz) STC
125 250 500 1000 2000 4000
B-10 LAG 15 16 21 26 33 38 26
B-10 LAG/QFA-3 18 18 23 30 39 46 29
B-10 LAG/QFA-9 19 20 23 33 44 53 30
Per ASTM: E90

 

Physical Properties of Components
Product Weight Thickness Service
Temperature
Tensil
Strength
Tear Strength Elongation "R"
Factor
Barrier
B-10 LAG 1 Lb. PSF .090" -10o to + 180oF 400 PSI 72 40% -
Decoupler/Absorber
QFA-3 .2 lb. PSF 1" Nom -20o to + 350oF - - - 4.0
QFA-9 .4 lb. PSF 2" Nom -20o to + 350oF - - - 8.0
Flammability Properties
B-10 LAG

UL94-Meets VO      FMVSS-302: Pass

B-10 LAG/QFA-3

ASTM E-84 "Surface Burning Characteristics of Building Materials";
Meets Class A Rating: Flame Spread Index 12.5  - Smike Density Index 19.5

B-10 LAG/QFA-9

Industrial Noise Curtains on a pipe

Table showing how the human ear perceives noise reduction.

Decibel Reduction Reduction Experienced by Ear
2 15%
4 23%
6 38%
8 48%
10 56%
12 63%
14 68%
16 75%
18 77%
20 81%