• Channel

Size	t1	t2	kg/m
75×40	5	7	6.92
100×50	5	7.5	9.36
125×65	6	8	13.4
150×75	6.5	10	18.6
	9	12.5	24.0
180×75	7	10.5	21.4
200×80	7.5	11	24.6
200×90	8	13.5	30.3
250×90	9	13	34.6
	11	14.5	40.2
300×90	9	13	38.1
	10	15.5	43.8
	12	16	48.6
380×100	10.5	16	54.5
	13	16.5	62
	13	20	67.3