For catchment areas greater than gutter capacity , slotted holes can be installed 如果汇水面积大于天沟排水能力，可以在天沟底部打孔。
2.
Class 1 - residential / light commercial snow melt : recommended for residential and light commercial walkways , driveways , entrances , and other light traffic ways , ramps and building entries 冰雪融化系统实际上可安装在任何地方，如停车场、车道、装卸区、桥梁、人行道、户外阶梯、檐槽、屋面天沟、屋顶、下水管道，大约地表5厘米下的混凝土中。
