Iron or steel plates fitted in various parts of heating elements of a boiler to prevent radiation of heat, or to protect against corrosion by waste gases.
Iipleyiti zesinyithi okanye intsimbi, zilfakewe kwindidi ezininzi zezigalelo zobushushu zesibilisi ukunqanda imitha yobushushu,okanye ukunqanda ekudlekeni kwemimoya echithwayo