5
optional vent arrangement through
window well under concrete slab
optional vent arrangement under
concrete slab
wall
cap
6" (15.2 cm)
round PVC
coupling
6" (15.2 cm)
round PVC
sewer pipe
6" (15.2 cm) round metal vent
Tightly pack gravel or sand
completely around pipe.
transition
6" (15.2 cm)
round metal vent
6" (15.2 cm)
round PVC
coupling
concrete slab
6" (15.2 cm)
round PVC
sewer pipe
6" (15.2 cm)
round 90°
PVC sewer
pipe elbow
6" (15.2 cm)
round 90° PVC
sewer pipe elbow
16" (40.6 cm)
maximum
12" (30.5 cm)
minimum
SBCCI
SBCCI
wall
cap
window
well
6"
(15.2 cm)
min.
Tightly pack gravel or sand
completely around pipe.
transition
6" (15.2 cm)
round metal vent
6" (15.2 cm) round
PVC coupling
6" (15.2 cm)
round sewer pipe
6" (15.2 cm) round
90° PVC sewer
pipe elbow
concrete
slab 6" (15.2 cm) round
PVC coupling
12" (30.5 cm)
minimum 6" (15.2 cm) round
PVC sewer pipe
Vent Equivalent No. of Total
Piece Length Pieces/ Equivalent
Length Length
straight vent per lineal foot
3-1/4" x 10" (8.3 x 25.4 cm) 1 ft. (30.5 cm)
6" (15.2 cm) round 1 ft. (30.5 cm)
6" (15.2 cm) flexible 2 ft. (61 cm)
elbow
6" (15.2 cm) round 45° elbow 2.5 ft.
(76.2 m)
6" (15.2 cm) round 90° elbow 5 ft.
(1.5 m)
3-1/4" x 10" (8.3 x 25.4 cm) 12 ft.
flat elbow (3.7 m)
3-1/4" x 10" (8.3 x 25.4 cm) 5 ft.
90° elbow (1.5 m)
transition to round
3-1/4" x 10" (8.3 x 25.4 cm) to 9 ft.
6" (15.2 cm) 90° elbow (2.7 m)
3-1/4" x 10" (8.3 x 25.4 cm) to 4.5 ft.
6" (15.2 cm) (1.4 m)
transition to flat
6" (15.2 cm) to 3-1/4" x 10" 5 ft.
(8.3 x 25.4 cm) 90° elbow (1.5 m)
6" (15.2 cm) to 1 ft.
3-1/4" x 10" (8.3 x 25.4 cm) (30.5 cm)
wall cap*
3-1/4" x 10" (8.3 x 25.4 cm) 0 ft.
(0 cm)
6" (15.2 cm) round 0 ft.
(0 cm)
roof cap*
10" x 10" (25.4 X 25.4 cm) 0 ft.
(0 cm)
thermal break
6" (15.2 cm) round 2 ft.
(61 cm)
Total equivalent vent system length
Determine equivalent length of vent.Maximumequivalent length of vent is 60 ft (18.3 m).List the number of each piece and length of straight vent you will use.
Multiply the equivalent length by the number of pieces. Add the totals
to get the total equivalent length of your system.
air flow
air flow
air flow
*Length for required wall/roof cap has already been incorporated
into rating for maximum vent system length. A suitable wall/roof
cap must be used.
30" (76.2 cm)
max.
42"
(106.7 cm)
max.
6" (15.2 cm) 90° elbow
2 ft.
(61 cm)
4 ft. (1.2 m)
6" (15.2 cm)
90° elbows
6" (15.2 cm)
wall cap
Note: Flexible metal vent is Not recommended.
If it is used, calculate each foot (30 cm) of flexible vent
as two feet (61 cm) of straight metal vent. Flexible
metal elbows count twice as much as standard elbows.
90° elbows (3) = 15 ft. (4.6 m)
12 feet (3.7 m) straight = 12 ft. (3.7 m)
Wall cap = 0 ft. (0 m)
Equivalent length of = 27ft. (8.3 m)
6" (15.2 cm) round system
6 ft. (1.8 m)