24 KBD Series Manual
Determine the number of 90 degree elbows in the vent system. (two 45 degree elbows count as one 90 degree elbow.)
Refer to the tables below to nd the maximum vent length based on the number of elbows and terminaon style.
Maximum vent lengths are specic to the fuel type of the tankless water heater. It is imperave when
performing equivalent vent length calculaons that the gas type be taken into consideraon.
0 80 (24.4) ** 85 (25.9) ** 95 (29.0) ** 95 (29.0) **
1 75 (22.9) ** 80 (24.4) ** 90 (27.4) ** 90 (27.4) **
2 70 (21.3) ** 75 (22.9) ** 85 (25.9) ** 85 (25.9) **
3 65 (19.8) ** 70 (21.3) ** 80 (24.4) ** 80 (24.4) **
4 60 (18.3) ** 65 (19.8) ** 75 (22.9) ** 75 (22.9) **
5 55 (16.8) ** 60 (18.3) ** 70 (21.3) ** 70 (21.3) **
6 50 (15.2) ** 55 (16.8) ** 65 (19.8) ** 65 (19.8) **
**SW 1 in DIPSW 1 is “OFF” for lengths greater than or equal to 21 feet
0 45 (13.7) ** 50 (15.2) ** 60 (18.3) ** 60 (18.3) **
1 40 (12.2) ** 45 (13.7) ** 55 (16.8) ** 55 (16.8) **
2 35 (10.7) ** 40 (12.2) ** 50 (15.2) ** 50 (15.2) **
3 30 (9.1) ** 35 (10.7) ** 45 (13.7) ** 45 (13.7) **
4 25 (7.6) ** 30 (9.1) ** 40 (12.2) ** 40 (12.2) **
5 20 (6.1) ** 25 (7.6) ** 35 (10.7) ** 35 (10.7) **
6 15 (4.6) ** 20 (6.1) ** 30 (9.1) ** 30 (9.1) **
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