MicroFiber Glass Wool Insulation for Air Conditioning Systems, FSF Model

Micro Duct Wrap

MicroFiber’s Micro Duct Wrap glass wool insulation is widely used for insulating air conditioning ducts, both in duct manufacturing plants, air grilles, or on-site in buildings using chillers and air handlers for duct insulation.

Air Conditioning System Insulation

Air conditioning systems using galvanized air ducts require insulation for two main reasons:

1. 1. To maintain the temperature of cool air inside the duct until it reaches the air outlets
      

      Cool air outlets in air conditioning systems

   2. To prevent condensation on the duct surface, as the low-temperature galvanized ducts come into contact with warmer outside air, causing water droplets to form
      

      Insulated ducts prevent condensation on the duct surface

Thermal Conductivity

Thermal Conductivity is a value that indicates how much heat can pass through a material. The higher the thermal conductivity, the more heat it can transmit.

For insulation, the thermal conductivity should be close to 0 to be considered good heat insulation. In air conditioning systems, using glass wool insulation is appropriate because it has a low thermal conductivity of only 0.034 W/m.K and is inexpensive, making it widely popular in the HVAC industry.

Water Absorption

As mentioned earlier, duct insulation in air conditioning systems prevents water droplets. Glass wool insulation can prevent water droplets due to its inherent properties. MicroFiber has further innovated by adding substances during the production process to prevent water absorption by the glass wool insulation.

Therefore, when water droplets form on the insulation, they will not be absorbed into the insulation material but will remain as droplets on the surface. If we splash water on the glass wool insulation, it will behave like a water-repellent coating on a car windshield.

Resistance to Mold and Fungi

The material used in glass wool insulation production is recycled glass or silica sand, melted and spun into fibers. Therefore, glass wool insulation is not a food source for living organisms. Mold, fungi, or rodents cannot eat glass wool insulation.

Surface Flame Spread

In air conditioning systems, fire safety is very serious because ducts branch throughout the entire floor of a building. In case of a fire, we should contain the fire to one area and prevent it from spreading to other areas. If materials attached to the ducts are flammable, it can cause rapid flame spread, which is highly detrimental.

Therefore, materials attached to ducts are tested for fire ignition and flame spread. Micro Duct Wrap glass wool insulation has been tested according to ASTM E84 standards to classify materials based on flame spread and smoke development characteristics.

Material Classification Table for Surface Fire Spread According to ASTM E84

	Flame-Spread Index (FSI)	Smoke Development Index (SDI)
Class 1 or Class A	0 – 25	450 Maximum
Class 2 or Class B	26 – 75	450 Maximum
Class 3 or Class C	76 – 200	450 Maximum

MicroFiber glass wool insulation has a Flame Spread < 25 and Smoke Developed < 50, classifying it as Class A

Micro Duct Wrap Glass Wool Insulation

FL

Duct insulation with aluminum foil facing, non-combustible 5-layer type, tested according to ASTM E84 and BS 476 Class O standards

FR

Glass wool insulation for air conditioning ducts, faced with non-combustible 5-layer aluminum foil, tested according to UL723, ASTM E84, ULC-S102M, and FM-Approved standards

FSF

Glass wool duct insulation faced with double-sided aluminum foil, non-combustible 7-layer type, tested according to UL723, ASTM E84, and BS476 Class O standards

FRD 524

Glass wool insulation for air conditioning ducts, faced with double-sided aluminum foil using Albar interlayer bonding technology for enhanced water and moisture resistance, non-combustible 6-layer type, tested according to UL723, ASTM E84, BS476 Class O, and Australian Standards

Product Size Table

Micro Duct Wrap Roll Sizes Table

Density (Kg/m3)	Thickness (mm)	Size (W x L)
16	25	1.22 x 30.50
	50	1.22 x 15.25
24	25	1.22 x 30.50
	38	1.22 x 15.25
	50	1.22 x 15.25
32	25	1.22 x 15.25
	38	1.22 x 15.25
	50	1.22 x 15.25
48	25	1.22 x 7.50
	38	1.22 x 7.50
	50	1.22 x 7.50

Technical Data Table

Features	MicroRoof Products				Test Standard
Density	16 Kg/m3	24 Kg/m3	32 Kg/m3	48 Kg/m3
Thermal Conductivity (W/m.K)	0.038	0.035	0.033	0.032	ASTM C518
Operating Temperature	Max Service Temp 233°C				ASTM C411
Moisture Absorption	< 1% at 49 C (95% RH)				ASTM C1104
Corrosion	Does not accelerate				ASTM C665
Fungal Resistance	No Growth				ASTM C665
Surface Burning Characteristics	Flame Spread < 25				ASTM E84
	Smoke Developed < 50
Fire Test	Class 0				BS 476 Part 6 BS 476 Part 7 ASTM 1530-3
	Ignitability Index 0
	Spread of Flame Index 0
	Heat Evolved Index 0
	Smoke Developed Index 1