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Application in Duct System
The duct system is used for heat or cooling air transmission.
The insulation is playing an important role in heat control
of duct system.
1.1 Fibrous glass duct
system
The fibrous glass duct system is
used to conserve heating and cooling energy and to control
duct-borne noise in commercial, institutional, or residential
heating, ventilating, and air-conditioning ductwork operating
in the range of + 2 in. w.g. (+ 500 Pa) static pressure,
up to at least 5,000 fpm (25.4 m/sec) internal air velocity,
and internal air temperature between 40°F (4°C)
and 250°F (121°C). Ducts are only for indoor use
and should be located in areas where ambient temperature
does not exceed 150°F (66°C).
The glass wool duct system is normally made up of nominal
1.2m sectons fabricated from 25, 38, or 51mm thick, flat
glass wool duct board stock having a factory-applied reinforced
aluminum exterior air barrier finish. Duct system sections
are fabricated using either specially designed hand tools
or grooving and closure machines. Duct fittings such as
tees, offsets, elbows, and transitions are also fabricated
from these modules or from flat duct board stock.
Duct board products are available with coated or faced airstream
surfaces. These products permit rigorous cleaning of the
duct surface where dust has been allowed to collect in the
duct due to lack of filtration or poor maintenance. Additionally,
some of these products have higher maximum velocity ratings.
1.2 Sheet metal ducts
lined with fibrous glass insulation
Glass wool duct liner insulation is designed for application
to the interiors of commercial, institutional and residential
sheet metal heating, ventilating, and air-conditioning ducts
to attenuate noise generated by central air handling equipment,
air movement within the ducts, and occupant cross-talk.
It also serves to reduce heat loss or gain through sheet
metal duct surfaces, and helps to prevent the formation
of water vapor condensation both inside the duct and on
its exterior surface. Fibrous glass duct liner insulation
is fabricated along with the sheet metal work in the shop,
providing quality workmanship under controlled conditions.
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