This article presents the experimental results concerning the effects of four types of covering layers on the sound absorptive property of a fiber glass board.

Using superior quality insulating cotton and high density of glass wool board, it supplied excellent keep-warming effect for the whole collector and reducing the heat loss within maximum limit.

Centrifugal glass cotton can be made into wallboard, ceiling, space sound-absorbing body etc, can be absorbed in a room, reduce doubled the reverberation time, reduce indoor noise.