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IQ Radiant Glass & High Performance Jansen Steel Windows - Analysis

Jansen Steel Façade, Window and Door Systems, VISS and Janisol, are recognized to have some of the highest, tested energy performance standards in the industry, Jansen fenestration systems reduce heat losses through the glass and steel openings of a building.

Jansen products, glazed with IQ Radiant Glass, achieve additional dynamic levels of energy control, improved thermal comfort and additional important benefits and assets. Included are:

  • Focused thermal comfort zones

  • Eliminate the need for floor radiators and vents, allowing increased floor space and greater freedom in furniture placement

  • Reduce condensation to zero eliminating sources of mold and odors

  • Eliminate airborne pathogens and dust

  • Reduced heating maintenance costs (no moving parts to replace)

  • Reduce noise levels (no hissing disturbance from forced hot air systems or motors pushing hot water)

  • Heating glass helps those who suffer from asthma and arthritis

  • Our heating glass reduces heat stratification, promotes superb thermal comfort while simultaneously allowing for lower interior ambient temperatures, reducing heating costs

  • Radiant heating glass can provide multiple controlled heating zones within the same room

The nature of radiant heat is that it allows for the substantial reduction of the internal ambient temperature of a building. It does so by not heating the air and instead directs heating to the people and things within the room.

*In winter months, traditional convection systems can simultaneously call for heating on the colder perimeter and for air conditioning on the inner core. The classical example, no one wants to sit at a restaurant window table in the winter.

Here is how we do it:

By passing an electric current through the resistive metal coatings of low-e coatings on the interior of insulated glass units (IGU) we create radiant heat in the desirable frequency range. This is made possible by special proprietary machinery and software systems. the process is guided by the window size, location and other requirements. The controlling system is integrated into the Smart Building system.

The IGU units are powered through metallic buss bars fused into the glass. The process eliminates the possibility of delaminations. The buss bars are hidden behind the glazing beads.

There are many possible uses designed into the invisible coating depending on outcome requirements and opening locations. Each unit of glass is built on a bespoke basis. For example, we have used the IQRG process for operable Jansen VISS skylights, Janisol Arte 2.0 for clerestory windows, pivot doors, interior window wall dividers and swing doors, The purpose of the systems in all cases were for condensation control and thermal comfort.

We integrate our systems into the building HVAC system.

The fundamental process of IQRG is to reduce heat losses, lower ambient internal temperature and provide thermal comfort where needed. We do this by heating the interior surface of the glass above the interior ambient temperature. (When the interior glass surface is 3-5 degrees F above the ambient internal temperature of the room, the cold bridge between the interior and exterior is broken.)

Heat flows to cold. When we sit next to a window in winter, our body radiates its heat to the window causing a chill. The heat from IQRG is generated on surface #3 on dual glazed panels.

The photo directly below shows surface #1, the exterior heat of a glass sample showing 77.6 degrees F. The photo beneath that shows the interior surface #4 temperature of 113.8 F. 50% of the heat generated on surface #3 goes into the room. 50% wants to go to the exterior but is redirected by the coating on surface #2 back into the room. Less that 5% of the total heat generated is lost to the exterior.


  • Rooms with fenestration and tall ceilings

  • High condensation areas (indoor swimming pools)

  • Skylights

  • Clerestory windows

  • Large glass external pivot doors

  • Multiple heating zones in a single room

  • Clean rooms

  • Living or work areas for asthmatics

  • Schools

  • Adaptive reuse of buildings with obsolete heating systems

  • Buildings with access to alternate electric energy sources.

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