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12".(30.5 sra)
ram]raUra
6" (15.2 era) reund metal vent
6" (15.2 cra)
round PVC
coupling
/
/
6" (15,2 era)
round 90° PVC
sewer pipe elbow
6" (15,2 era)
round PVC
(76.2 cra) ;_
sewer pipe
max.
\ 6" (15,2 era)
Tightly pack gravel or sand
round 90°
completely around pipe.
PVC sewer
pipe elbow
optional vent arrangement under
concrete slab
12" (30.5 cra)
6" (15.2 era} round transition
minimum
PVC sewer pipe
/6" (15.2 cra)
round raetal vent
wall
1
_
6" (15,2 cra) round
cap
PVC coupling
well
6"
(106,7 cra)
(15.2 era)
i
max.
rain.
6" (15,2 era) round
PVC coupling
5" (15.2 cra)
round sewer pipe
5" (15.2 era) round
g0° £VC sewer
pipe elbow
Tightly pack gravel or sand
completely around pipe.
optional vent arrangement through
window well under concrete slab
6" (15,2 era}
900 elbows
6"
15.2 cm
wa
cap
\
6 ft, (1,8 m)
90° elbows (3)
= 15 ft. (4.6 m)
12 feet (3.7 m) straight
= 12 ft. (3.7 m)
Wall cap
= 0ft.(0m}
Equivalent length of
6" (15.2 cm) round system
= 27ff. (8.3 m)
Note: Flexible metal vent is Net 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.
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 25.4 cm)
6" (152 crn) round
6" (15,2 crn) flexible
elbow
6" (152 crn) round 45° elbow
6" (15,2 crn) round 90° elbow
_--_
3-1/4" x 10" (8.3 x 25,4 crn)
_:,5 3:_ flat elbow
3-1/4" x 10" (8.3 x 25,4 crn)
90° elbow
transition to round
_-:-_-_m 3-1/4" x 10" (8.3 x 25.4 crn) to
_i _
air flow
_
-1/4" x 10" (8.3 x 25,4 crn) to
6" (152 crn)
transition to flat
......._m
6" (15.2 crn) to 3q_4" x 10"
_iL(8.3x2&4crn)
90 elbow
.....L_2"_
air flow
_
;_:/-; 6" (15,2 crn) to
?-¢_ _ i_; _ 3-1/4" x 10" 8.3 x 25,4 crn)
':_
air flow
wall cap*
x 10" (8.3 x 25,4 crn)
_
6" (15,2crn) round
roof cap*
lO.x 1 8,, x284
thermal break
-/_
6" (15,2crn) round
Equivalent
Length
1ft, (30.5era)
1ft. (30.5era)
2 ft. (61era)
2.5 ft,
(76.2 era)
5 ft.
(1.5 ra)
12 ft.
(3.7 ra)
5 ft.
(1.5 ra)
9 ft.
(2.7 ra)
4.5 ft,
(1.4 ra)
5 ft.
(1.5 ra)
I ft.
(30.5era)
0 ft.
(0 era)
0 ft.
(0 era)
0 ft.
(0 era)
2 ft.
(61 era)
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/reef
cap must be used.
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