Standard Test Method of Small-Scale Evaluation of Fire-Retardant Paints (2-Foot Tunnel Method) Fire-retardant, Flame spread, Paints, Tunnel method, Burning characteristics-paints/related, coatings/materials, Fire testing-paints/related coatings/materials, Flame spread, Flammability-paints/related coatings/materials, Paint testing, Tunnel method, Two-foot tunnel method