DuraVent FasNSeal 8090 Installation - Manual (Page 4)

4
should include maximum number of elbows
and related pressure-drops. The total vent
length from the appliance to the termination
should not be greater than the maximum
Figure 2
CAT I EXHAUST
PATH
CAT IV EXHAUST
PATH
other approved factory built vent), special
care must be taken. Prior to reline work
being started:
Ensure the new proposed vent system
is appropriate for the two appliances in
question. For the Category IV appliance,
reference the OEM Appliance manual for
information on min/max vent run and vent
diameter requirements. OEM guidance
TERMINATION
CAP
CAP MOUNT
STRAPS /
HARDWARE
FNS FLEX
COLLAR
CAT IV
FIRESTOP /
HARDWARE
B VENT
PRE-EXISTING
CATEGORY
IV EXHAUST
ENTRY
CAT I
EXHAUST
ENTRY
POLYPRO
TO FNS FLEX
ADAPTER
Figure 3
FNS FLEX
FIG.5
BIRDSCREEN
Table 2 - Equivalent Length Chart
2" Equivalent Length 3" Equivalent Length 4" Equivalent Length 5" Equivalent Length
1-ft Rigid Pipe 1-ft 1-ft 1-ft 1-ft
1-ft SS FNS (or
Secure Seal)Flex Same as rigid pipe (or
elbows)
Same as rigid pipe (or
elbows)
Same as rigid pipe (or
elbows)
Same as rigid pipe (or
elbows)
1-ft Flex Pipe
0.4-ft
(updsized one diameter)
0.6-ft
(updsized one diameter)
0.6-ft
(updsized one diameter)
N/A
45 Elbow 3-ft 3-ft 5-ft 6-ft
90 Elbow 5-ft 7-ft 12-ft 14-ft
Tee 9-ft 12-ft 19-ft 21-ft