So, at 20' from the heat source, intensity of the energy concentration is the intensity developed at 10' distance. For comfort heating, there must be reasonably even accumulated values of heat throughout the comfort zone. Proper mounting heights of the individual heaters, fixture spacing, reflector beam patterns, and heat source wattage must be specified to generate the proper heating levels at the task area. Infrared is not absorbed by the air. With Infrared heating, the warmth is directed and concentrated at the floor and people level where it is really needed.
Infrared energy is absorbed solely at the area it is directed.
Therefore it is possible to divide any area into separate smaller zones and maintain a different comfort level in each zone. For example, Zone A, with a high concentration of people, could be maintained at a 70 degree comfort level while at the same time Zone B. a storage area, could be kept at 55 degrees or even turned off completely. During the second stage, two heat sources in every fixture would be energized. For further control sophistication, a large area can be both zoned and staged. Actual savings will vary from building to building depending on factors such as insulation, ceiling height and type of construction.