Regency® P121E-11/P131E-11 Zero Clearance Direct Vent Gas Fireplace | 29installationVertical Venting with Two (2) 90o ElbowsOption V + V1 HA) 1' (305mm) Minimum 4' (1.22m) MaximumB) 2' (610mm) Minimum 6' (1.83m) MaximumC) 3' (914mm) Minimum 9' (2.74m) MaximumD) 4' (1.22m) Minimum 12' (3.66m) MaximumE) 5' (1.52m) Minimum 15' (4.57m) MaximumF) 6' (1.83m) Minimum 17' (5.18m) MaximumVertical Venting with Two (2) 90o ElbowsVertical Venting with Three (3) 90o ElbowsDiagram 9 Diagram 10Diagram 11Option V H + H1A) 1' (305mm) Minimum 2' (610mm) MaximumB) 2' (610mm) Minimum 4' (1.22m) MaximumC) 3' (914mm) Minimum 6' (1.83m) MaximumD) 4' (1.22m) Minimum 8' (2.44m) MaximumWith the above options, maximum total pipe length if 37 feet withminimum of 6 feet total vertical and maximum 17 feet total horizontal.Please note minimum 1 foot between 90o elbows is required.With the above options, maximum total pipe length if 37 feet withminimum of 4 feet total vertical and maximum 8 feet total horizontal.Please note minimum 1 foot between 90 o elbows is required.Option V + V1 H H + H1A) 2' (610mm) Min. 1' (305mm) Max. 2' (610mm) Max.B) 3' (914mm) Min. 4' (1.22m) Max. 5' (1.5m) Max.C) 4' (1.22mm) Min. 6' (1.86m) Max. 8' (2.4m) Max.D) 5' (1.5m) Min. 8' (2.4m) Max. 12' (3.6m) Max.With the above options, maximum total pipe length if 37 feet withminimum of 5 feet total vertical and maximum 12 feet total horizontal.Please note minimum 1 foot between 90 o elbows is required.