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IQRG Condensation Control Solutions for Heated Buildings in Moderately Cold and Mixed Climates


Applicable to skylights, windows, facades, indoor swimming pools, restaurants and any other glazing application where glass condensation is problematic.



Excessive indoor humidity is a well-known risk factor for buildings in cold and mixed climates. It is bad for health and bad for business. Museums, Art Galleries, Schools, Healthcare and Libraries in particular are at risk.


Maintaining an indoor climate of the air continuously humidified at 40 to 50% RH at 70°F (21°C) may seem reasonable, but that does not take into affect condensation over many weeks in cold climates. This is caused by the high DPT versus the low R-value of the glazing and in some cases, an even lower R-value of the window frames.


Dew point temperature (DPT) is the temperature at which a moist air sample at the same pressure would reach water vapor "saturation."


IQ Radiant Heating Glass controls the interior surface temperature of insulated glass units, eliminating window frame and glass condensation

IQ Radiant Glass (DPT) Chart

NOTE: In 2008, a test conducted at KSU by the International Quality and Research Group (IQRG) studied the effectiveness of different heating systems in a building environment. The study compared the use of radiant glass with forced air using natural gas. The results showed that using radiant glass had numerous benefits, including: - It reduced the interior air movement noise level to zero as radiant heat does not require fans and ductwork to deliver heat. - The radiant delivery system caused no air movement, thus eliminating the transmission mechanism for pollens and air-borne particles. - It reduced heating demand, expressed in BTUs by 44% while doubling the area of thermal comfort. - There was no transmission loss through the ductwork using radiant heated glass. - Condensation, a major cause of mold, did not form on radiant glass. - An ancillary benefit of Radiant Window systems is no condensation forms on the glass. These findings indicate that the use of radiant glass can significantly improve the indoor air quality and reduce the energy demands of a building.



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