Installation guide

Direct Venting (Two-pipe System)

Vent Length Requirements (continued)

Maximum vent/air intake pipe length - horizontal/vertical (hybrid system) (continued)

Legend

Support system

Flashings

Exhaust (straight coupling) with

screen

Combustion air intake with screen

a Equivalent length (exhaust)

b Equivalent length (air intake)

c min. 18” / max. 48”

Standard long sweep elbows (for CPVC pipe only)

Fig. 55

For plastic pipe only

90° long sweep elbow

equivalent to 5 ft. / 1.5m

90° short sweep elbow

equivalent to 8 ft. / 2.4m

(if used)

Note:

If standard sweep elbows are used the allowable vent lengths are reduced.

One standard 90° elbow is equivalent to 8ft. / 2.4m of straight pipe.

Table 42. Standard long sweep elbows

Material

90° elbow

equivalent length

ft./m

45° elbow

equivalent length

ft./m

Stainless steel 3 / 0.91 2 / 0.61

CPVC plastic pipe 5 / 1.52 3 / 0.91

5368 815 v2.0 b

Flue

Air

Fig. 54 Vitodens 200-W WB2B 17-45, 17-60, 30-80, 30-105