Round vs Rectangular Equivalent Duct Sizes Table 9.32.3.10.B. Forming Part of Sentence 9.32.3.10.(10) [mm]: Inche(s): = Table 9.32.3.10.B. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only. Similar articles Venting of Laundry-Drying Equipment Wiring in ducts and plenum chambers Temperature control Required Barrier to Air Leakage