"In the outdoor environment molds are ubiquitous. Moist conditions involving drywall, wood, carpeting, or paper material are the proliferation medium in the indoor environment for toxic molds. Since Americans spend 75 to 90% of their time indoors, the risk of exposure to toxic molds that may grow indoors is increased (R- 1). Toxic molds enter the indoor environment through doorways, windows, heating and ventilation systems, and air conditioning systems, given the appropriate circumstances. Spor.