WEBTo avoid a premature demage by cooling and condenstaion in dust loaded processes, we recommend a heated tube type SP30-H1.1-V, including an insitu pre-filter V20-2/30, heated up with the tube. Description The electrically heated M&C sample tube SP30-H... is available in 0,6 m, 1,0 m, 1,5 m and 2,0 m length and the SP35-H... in 0,175 m length.