Collections of coal fly ash by high-temperature glassfiber fabrics were tested aiming at control of particulates from industrial coal-fired boilers. Growth of dust deposition and pressure drop were investigat-ed by barying filtration velocity and dust loading at a bench-scale test unit. Characteristics of fabrics recently developed by Kangnam Ind. Co. (KN-448) were compared by those of imported fabrics manufactured by Burlington Glass Fabrics Co. (Bt-448). Pores of KN-448 were not so complete and uniform as those of BT-448 and pressure drop across KN-448 was lower than that across BT-448. However relative difference of pressure drops between the two fabrics was reduced with increasing dust loading.