SFG All-Service Faced Duct Wrap Insulation is not recommended for use in duct systems subject to continuous service at temperature in excess of  120oC.  It should not be exposed to weathering or mechanical abuse without proper protection.  It is not designed for use on the inside of ducts.    
 Product

AFD 16

AFD 24

 Nominal Density  (kg/m3)

16

24

 Nominal  Thickness (mm)

25, 38

 50, 64 25, 38 50, 64
 Width (m) 1.22 1.22 1.22 1.22
 Length (m) 30.5 15.25 30.5 15.25
 Facing Aluminum Foil Scrim Kraft
APPLICATION RECOMMENDATION

  • Sheet metal ducts must be clean, dry and tightly seated at all joints and seams prior to installation of duct wrap.

  • Duct wrap installation shall be cut to "Stretch-Out" dimensions as provided in instructions, and a 50 mm (2") piece of insulation removed from the facing at the end of the piece of insulation to form an overlapping tape flap, as shown below.  Failure to provide this flap may result in an unsatisfactory moisture vapor seal at the joint.    

  • Install with facing outside so that the tape flap overlaps insulation and faces at other end.  Insulation shall be tightly butted.  If ducts are rectangular or square, insulation should not be excessively compressed at duct corners.  Seams shall be tacked tape approximately 150 mm (6") on center.

  • Where rectangular ducts are 610 mm (24") in width or greater, duct wrap shall be secured to the bottom of the sheet metal duct with mechanical fasteners spaced 450 mm (18") on center (maximum).

  • To ensure the integrity of the facing as a vapor barrier (to prevent condensation from vapor barrier failure), seal all seams, tears, punctures, and other penetrations of the insulation facing with approved tape to provide a vapor tight system.  

Selection of insulation thickness and application of insulation are the responsibility of the engineer and the contractor.   

STRETCH - OUT DIMENSION

Nominal Thickness Average Installed Thickness Round and Oval Ducts Square Ducts Rectangular Ducts

1" (25mm)

 3/4" (19mm) P+7" (178mm) P+6"(152mm) P+5"(127mm)

1 1/2" (38mm)

 1 1/8" (28mm) P+9 1/2"(241mm) P+8.0(203mm) P+7.0(178mm)

2" (50mm)

 1 1/2" (38mm) P+12"(305mm) P+10"(254mm) P+8"(203mm)

2.2 (56mm)

 1.65 (42mm) P+13"(330mm) P+11"(279mm) P+8 1/2"(279mm)

3" (76mm)

 2 1/4" (57mm) P+17"(432mm) P+14 1/2"(368mm) P+11 1/2"(292mm)
 
TECHNICAL INFORMATION

SOUND ABSORPTION COEFFICIENT - The ratio between sound intensity before and after impact material.

-

sound intensity is absorbed by material 
- each material has different sound absorption characteristics
- Sound Absorption Coefficient is measured at 6 frequency (125, 250, 500, 1000, 2000, 4000 Hz.)   
- ASTM C423

NOISE REDUCTION COEFFICIENT (NRC)

The Average of Sound Absorption Coefficient at 250,   500,   1000,    2000   Hz

 - If NRC > 0.4 that material is Sound Absorber
 - Humans can not detect an NRC value difference of about 0.05

SOUND TRANSMISSION LOSS (STL) - indicates a material's capability to attenuate sound transmittance.
 - The higher the STL value the more effective the material is decreasing sound transmittance

SOUND TRANSMISSION CLASS (STC)

 - The average of Sound Transmission Loss values indicating the capability of wall, floor or ceiling system to block
   sound transmittance
 - STC is measured at 16 frequencies (125 - 4000 Hz.)
Note: - STC is measured in decibel unit (dB)

DEFINITION OF CONDENSATION

CONDENSATION

 - Most air will condense when it comes in contact with a surface whose temperature is equal to dew point 
   temperature. 
 - The greater the moisture in the air is,  the greater the opportunity is for condensation to occur.  

CONDENSATION PREVENTION
 - Use insulation with appropriate thermal resistance (density & thickness)
 - Use Vapor Barrier to prevent the moist air from entering the insulation
 - Use ventilation to decrease vapor accumulation
 

VAPOR BARRIER

A facing material whose vapor permeability is < 1 perm

" 1 perm "  = Amount of vapor 5.72 x 10-11 kg         moves through surface 1 m2 in 1 second mean while pressure difference is 1 Pa.
 
Usually the vapor barrier shall face the warm side.

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