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Roof T e rm ination (Pref erred)At least 36 in.(914mm)Concent ri c V ent and Comb ustion Ai rRoof T er mination (pre fe rred)V e r tical separationbetween <strong>com</strong>b ustionair and v ent8 3/4 in. (222mm)f or 3 in. (76mm)ki t6 3/4 in. (172mm)f or 2 in. (51mm) ki t 18 in. maximu m (457mm)AAt least36 in.(914mm)AMaintain 12 in. (305mm)min. clearance abo vehighest anticipatedsno w le ve l, maximum of24 in . abo v e roofMaintain 12 in. (305mm)min.clearance abo vehighest anticipatedsno w le ve lMaximum of 24 in.(614mm)abo v e roofNote: "A" denotes 0 to < 2 in. (51mm)Between the first 2 ventsThird vent must be > 36 in. away (914mm)Abandoned masonr yused as race wa y(per code)1 in. (25mm) maximum (typ) from wall to inlet12 in. (305mm) minimum fro mov erhang or roof90 °A12 in. min fro mov erhang or roof(typ)12 in. (305mm)separation betweenbottom of<strong>com</strong>b ustion air andbottom of v ent (typ)AA t le a s t3 6 in .At least 36 in.(914mm)Side wa ll te rm inatio nof less than 12 in. (305mm) above highest snow levelAConcent ri c V entand Comb ustion - AirSide T e rm inatio nMaintain 12 in. (305mm)min. clearance ab ov ehighest anticipatedsno w le v el or gradewhich eve r is greate r59TP5AA t least 36 in .(914mm)Maintain 12 in. (305mm)min. clearance abo vehighest anticipatedsno w le ve l or gradewhiche ve r is greater (typ)Fig. 47 - Combustion Air and Vent Pipe Termination for Direct Vent (2 -Pipe) SystemA05090Roof Termination (Preferred)VentMaintain 12 in (305mm) .minimum clearanceabove highest anticipatedsnow level maximum of24 in. (610mm) above . roofAbandoned masonryused as raceway(per code)6 in. (152mm) minimum clearancebetween wall and end of vent pipe.10 in. (254mm) maximum pipe length12 in. min. (305 mm)fromoverhang or roof12 in. (305 mm) min. fromoverhang or roofMaintain 12 in. (305mm)minimum clearanceabove highest anticipatedsnow level or gradewhichever is greater90°Sidewall Terminationwith Straight Pipe (preferred)Maintain 12 in. (305mm)minimum clearanceabove highest anticipatedsnow level or gradewhichever is greater.Side wall terminationwith 2 elbows (preferred)Fig. 48 - Vent Pipe Termination for Non -Direct Vent and Ventilated Combustion Air SystemA0509155

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