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6" (15.2 cm) round metal vent
wall
cap _
v
12" !30.5 cm)
minimum
6" (15.2 cm)
round PVC
coupling
6" (15.2 cm)
round 90° PVC
sewer pipe elbow
max.
_ 6" (15.2 cm)
Tightly pack gravel or sand
round 90°
completely around pipe.
PVC sewer
pipe elbow
optional vent arrangement under
concrete slab
t2" (30,5 cm)
6" (15.2 cm) round transition
minimum
PVC sewer,, p ipe
/6" (15.2 cm)
round metal vent
wall
/
_
6" (15.2 cm) round
cap
PVC coupling
(15.2 cm)
rain.
42"
(106.7 cm)
max.
6" (15.2 cm) round
PVC coupling
6" (15.2 cm)
round sewer pipe
6" (15.2 cm) round
90° PVC sewer
pipe elbow
Tightly pack gravel or sand
completely around pipe,
optional vent arrangement through
window well under concrete slab
2 ft,
{61 cm)
(15,2 cm) 9g° e_bow
4 ft, {1,2 m)
90° elbows (3)
= 15 ft. (4.6 m)
12 feet (3.7 m) straight
= 12 ft. (3.7 m}
WaUUcap
= Oft.(0m)
Equivalent Uengthof
6" (15.2 cm) round system
= 27ft. (8.3 m)
Note: FtexiMe metaJ vent is Not recommended.
Ufit is used, caUcuUate e ach foot (30 cm) of flexiMe vent
as two feet (61 cm} of straight metal vent. Flexible
metal elbows count twice as much as standard elbows.
Determine
equivalent
length of vent. Maximum
equivalent
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.
Vent
Piece
straight vent per lineal foot
3-I/4" x 10" (8.3 x 254 cm)
6" (152 cm) round
1 ft. (30,5cm)
1ft, {30.5cm)
6" (152 cm) flexible
2 ft.
elbow
6" (152 cm) round 450 elbow
8" (152 cm) round 90" elbow
_
---_, 3-I/4" x 10" (8.3 x 25.4 crn)
_
flat elbow
3-1/4" x 10" (8.3 x 25.4 crn)
90° elbow
transition to round
_-- :::;-_1 3-I/4" x 10" (8.3 x 25_4cm) to
",_,_
8"(15.2 o re) 9 0 °elbo_
\_ _'-(_air
flow
_
-1/4" x 10" (8.3 x 25.4 crn) to
6" (15.2 crn)
transition to fiat
i_:_'1 6" (15.2 cm) to
"-_ _:_
I' 3-1/4" x 10" 8.3 x 254 crn)
_'_
air flow
wall cap*
[_:_>
3-1/4" x 10" (8.3 x 25.4 crn)
LS_j_
6" (152 cm) round
roof cap*
lg,,x 1 0,,/g54
x254
thermal break
-/_
6" (152 cm) round
{6t cm)
2.5 ft.
(76,2 m}
5 ft.
(1,5 m}
12ft.
(3,7 m)
5 ft.
(1,5 m)
9ft.
(2.7 m)
4.5 ft.
(1.4m)
5 ft.
(1,5 m}
1 ft.
(30,5era)
Oft.
(Ocm)
Oft,
(Ocm)
Oft,
(Ocm)
2ft,
(6t cm)
No. of
Pieces/
Length
Total
Equivalent
Length
Total equivalent vent system length
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.
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