Current Energy Leakages in Egyptian Buildings - Energy Efficiency in the Urban Environment - page 231

TABLE 9.12
Minimum Duct Insulation R-Values, Combined Heating and Cooling Supply Ducts and Return Ducts

Duct Location

Climate
Zone

Ventilated
Attic

Unvented Attic above
Insulated Ceiling

Unvented Attic with
Roof Insulation

Unconditioned
Space

Indirectly
Conditioned Space Exterior Buried

Supply Ducts
1

R-1.41 R-1.41 R-1.76 R-1.06 R-1.06 None R-1.06

2 R-1.41 R-1.41 R-1.41 R-1.06 R-1.41 None R-1.06

3 R-1.41 R-1.41 R-1.41 R-1.06 R-1.41 None R-1.06

4 R-1.41 R-1.41 R-1.41 R-1.06 R-1.41 None R-1.06

5 R-1.41 R-1.41 R-1.41 R-0.62 R-1.41 None R-1.06

6 R-1.76 R-1.41 R-1.41 R-0.62 R-1.41 None R-1.06

7 R-1.76 R-1.41 R-1.41 R-0.62 R-1.41 None R-1.06

8 R-1.76 R-1.94 R-1.94 R-0.62 R-1.41 None R-1.41

Return Ducts
1-8

R-1.06 R-1.06 R-1.06 None None None None

Source: EEECBC EGYPTIAN Energy Eficiency Code, HBRC, 2012.
Note: Insulation R-values, measured in m 2 k/kW, are for the insulation as installed and do not include ilm resistance. The required minimum
thicknesses do not consider water vapour transmission and possible surface condensation. Where exterior walls are used as plenum walls,
wall insulation shall be as required by the most restrictive condition of 6.4.4 2 or Section 5. Insulation resistance measured on a horizontal
plane in accordance with ASTM C518 at a mean temperature of 23.8°C at the installed thickness. Includes crawl spaces, both ventilated and
non-ventilated. Includes return air plenums with or without exposed roofs above.