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Top Vent - Vertical Termination - (continued) Three Elbows INSTALLED HORIZONTALLY V2 H2 H1 V1 V1 H1+ H2 V2 V1+ V2 Minimum H1+ H2 Maximum 6 in. 152 mm 3 ft 914 mm * * * 3 ft 914 mm 1 ft 305 mm 3 ft 914 mm * * * 3 ft 914 mm 2 ft 610 mm 6 ft 1.8 m * * * 6 ft 1.8 m 4 ft 1.2 m 12 ft 3.7 m * * * 12 ft 3.7 m H1 + H2 = 17 ft (5.2 m) Maximum V1 + V2 + H1 + H2 = 50 ft (15.2 m) Maximum V1 = 6 inches (152 mm) Minimum 6 66 Vent Clearances and Framing A. Pipe Clearances to Combustibles Fire Risk. Explosion Ri