... infrared rays of wavelength 8-15uM can be good for human, and the radiation of far infrared rays are ... heating result as normal underfloor heating, which makes them suitable for home use, churches, classrooms, swimming pools, stadiums and ... rooms. Outdoor application: snow-melting for airport runway, roofs, gutters, heat preservation for pipelines, defrosting for drains, lands,stairways, layground and ...