防止紫外线，保护眼睛及脸部，经过滤后的所有紫外光辐射符合规定的最大允许紫外辐射水平。
It Prevent ultraviolet ray, protect eyes and face, pass through sieve posterior all ultraviolet light radiate accord with stipulation the most big permit ultraviolet radiation level.
确定了过压保护的重要元件MOV的过电压保护水平和最大允许能耗。
Overvoltage protection level and maximum allowable energy dissipation of MOV are ascertained.
关于烟管尺寸及允许的最大水平长度(包括起始弯管)，请参照下表。
Refer to the table provided for information on flues and maximum permitted straight horizontal length, including the starting elbow.
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