GLASS SELECTION GUIDE - Eboss

HEAT LOSS
(INSULATION)
Heat Loss from the thermal envelope is a key factor in modern housing design.
In winter the Insulating Glass Unit can trap heat inside the house and thus reduce the amount
of heating required (kWh) to maintain a comfortable environment.
In summer the Insulating Glass Unit can trap the cool air inside the house and reduce the amount
of cooling required to maintain a comfortable environment.
In all seasons the Insulating Glass Unit can reduce the energy loads on Heating, Ventilating and
Air Conditioning (HVAC) systems.
GOOD
4mm clear
12mm airspace
4mm clear
Solution:
GlassTech IGU
Is GOOD because it meets the minimum
requirements for thermal insulation for
housing and small buildings (NZS 4218).
INNER
OUTER
BETTER
4mm Low E
12mm airspace
4mm clear
Solution:
GlassTech Low E + IGU
Low E glass provides BETTER thermal
insulation as it traps the heat inside by
reflecting long wave radiation.
INNER
OUTER
BEST
4mm Low E
INNER
12mm Argon
4mm clear
OUTER
Thermal
spacer
Solution:
GlassTech Low E + IGU
and Argon +
By combining Low E glass and argon gas
the BEST thermal insulation is achieved.
Thermal spaces can be used in thermally
efficient frames to improve the total
window performance.
www.metroglasstech.co.nz April 2013