SPCR

what are the drawbacks using sound absorption material, and what brand is the best?

I found this but it looks ugly

http://www.acoustiproducts.com/en/acous ... timate.asp

Happy Hopping wrote:does sound absorption material increases heat in a case?

The heat loss through the case walls will actually be negligible compared to what you blow out through ventilation. Often the gradient will be less than 10°C and you have two air-solid transitions. The absorption material obviously adds bulk, depending on the surface structure possibly sequesters dust and impedes airflow.