Double3

A

Any

Argon

0.48

0.41

0.32

 

B

Any

Argon

0.46

0.39

0.30

 

C

Any

Argon

0.44

0.37

0.28

 

C

High

Performance

Argon

0.42

0.35

Deemed to

comply5

Triple4

A

Any

Air

0.50

0.44

0.26

 

B

Any

Air

0.45

0.39

0.22

 

C

Any

Air

0.41

0.34

0.20

 

Any double low-e

Any

Air

0.35

0.32

0.18

Low-eA (emissivity) shall be 0.24 to 0.16.

 

Low-eB (emissivity) shall be 0.15 to 0.08.

 

Low-eC (emissivity) shall be 0.07 or less.

Aluminum Thermal Break = An aluminum thermal break framed window shall incorporate the following minimum design characteristics:

a)

The thermal conductivity of the thermal break material shall be not more than 3.6 Btu-in/h/ft2/°F;

b)

The thermal break material must produce a gap in the frame material of not less than 0.210 inches; and

c)

All metal framing members of the products exposed to interior and exterior air shall incorporate a thermal break meeting the criteria in a and b above.

A minimum air space of 0.375 inches between panes of glass is required for double glazing.

A minimum air space of 0.25 inches between panes of glass is required for triple glazing.

Deemed to comply glazing shall not be used for performance compliance.