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1: Active solar heating system 2: Soil 3: Feeder 4: Community 5: Carbon 6: Range 7: Fishery 8: Contamination 9: Lead 10: Water 11: Change 12: Electricity 13: Current 14: Japan 15: Condition 16: Uptake 17: Hazard 18: Process 19: Conservation 20: Atom (As of 18:17)
A Low-Slope Roof is a roof surface with a maximum slope of 2 inches "rise" for 12 inches "run" as defined in American Society for Testing and Materials Standard E 1918-97. ENERGY STAR low-slope products have a
minimum reflectance of 0.25, or 25%.