Vent Duct Specification RV1923 18oz Yellow T OT AL WEIGHT 18 OZ SQ YD COA TED P V C TENSILE 320 W X 380 F LBSIN TEAR 100 X 1 10 LBS CONSTRUCTION W ARP KNIT FIBER POL YESTER RV2200 22oz Orange T OT AL WEIGHT 22 OZ SQ YD COA TED P V C TENSILE 410 W X 380 F LBSIN TEAR 120 PLUS X 1 10 PLUS LBS CONSTRUCTION W ARP KNIT FIBER POL YESTER RV2600 26oz Yellow T OT AL WEIGHT 26 OZ SQ YD COA TED P V C TENSILE 500 W X 480 F LBSIN TEAR 140 PLUS X 120 PLUS LBS CONSTRUCTION W ARP KNIT FIBER POL YESTER RV2210 28oz Orange T OT AL WEIGHT 28 OZ SQ YD COA TED P V C TENSILE 700 W X 660 F LBSIN TEAR 125 PLUS X 120 PLUS LBS CONSTRUCTION BASKET WEA VE FIBER POL YESTER The ventilation ducts are certified by Natural Resources Canada under Certification 1181 The ducting also conforms to CANCSAM427M91 ROCVENT INC MINE TUNNEL VENTILATION 4 wwwrocventcom