DuraVent FasNSeal 8090 User Manual

Installation Instructions

FNS 80/90

Combined Category I and
IV venting for Gas-Burning
Appliances

For the most up-to-date installation instructions, see www.duravent.com

CONTENTS

LISTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . 3

NOTES / A PPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

CLEARANCES TABLE 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 3

PRIOR TO INSTALLATION. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .3

INSTALLATION OF LINER. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . .5

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

WARRANTY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

®

A MAJOR CAUSE OF VENT RELATED FIRES IS FAILURE

TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES)
TO COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST

IMPORTANCE THAT DURAVENT PRODUCTS BE INSTALLED

ONLY IN ACCORDANCE WITH THESE INSTRUCTIONS.

WARNING

CARBON MONOXIDE POISONING
HAZARD. Failure to follow the steps
outlined below for each appliance
connected to the venting system being
placed into operation could result in
carbon monoxide poisoning or death.

• Examine all components for possible

shipping damage prior to installation;

• Read all instructions before beginning

the installation and follow these
instructions exactly as written.

• Proper joint assembly is essential for a

safe installation. Check the integrity of
ALL joints upon completion of assembly

• This venting system must be free to

expand and contract under normal
operation.

• Assure unrestricted vent movement

where required through walls, ceilings
and roof penetrations.

• This venting system must be supported

in accordance with these instructions.

• Do not mix pipe, ttings, or joining

methods from dierent vent system
manufacturers. Do not use adhesives
of any kind with this venting system.
Acceptance of the installed system is
dependant on full compliance with
these installation instructions.

WARNING

Risk of carbon monoxide poisoning
or re due to joint separation or pipe
breakage.

Keep these instructions for future
reference.

Dear Customer, Installer, or End User:

We welcome any comments regarding
matters pertaining to our DuraVent products.
We welcome any ideas, input or complaints
to help improve our product oering.

If you are searching for tech support or
product information, please phone us at
800-835-4429.
Or email us at:
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LISTED

MH6357

LISTING

M&G DuraVent's FNS 80/90 Combination
Cat I and Cat IV gas vent system is designed
and UL listed for use with approved M&G
Duravent / Security Chimneys special gas
vent components only! Listed to applicable
portions of ULC S636/UL1738, UL1777, and
UL441.

GENERAL INSTALLATION NOTES
Read these instructions before beginning.

You must follow these installation
instructions when installing the FNS 80/90
system. This is a supplemental instruction to
other DuraVent listed instructions that are
used during this installation.

APPLICATION

The FNS 80/90 system is a tested and listed
exhaust vent for the replacement of one
Category I gas red appliance with a high
eciency appliance in an existing Type B
common vent system. In a typical common

IMPORTANT

The vent system must be installed in
accordance with local code requirements
and appropriate National Codes: In the
US: NFPA 54 / ANSI Z223.1 National Fuel
Gas Code or the International Fuel Gas
Code.

vent Type B setup (Fig.1), two Category I
(Cat I) appliances vent into one common
vent that conveys ue products outside the
building. In many appliance retrots, one
Cat I appliance is removed, and replaced
with a higher eciency (typically a Cat
IV) condensing appliance. The new Cat IV
appliance is NOT permitted to be vented with
B Vent, but requires a vent system engineered
for a dierent exhaust requirement.
Condensing appliances have much lower
exhaust temperatures, which create
signicant amounts of acidic condensate.
Using the FNS 80/90 solution, a special
stainless steel Cat IV liner is installed within
the existing Cat I vent. This ex handles the
Cat IV ue products, while the remaining
Cat I appliance uses the annular space
around the liner to exhaust ue products
to the outside via natural draft (Fig.2). A
patent pending termination is engineered
to provide separate exhaust exit paths for
each appliances's exhaust system (Fig.2). The
combination of these systems helps both
operate more eectively.

PRIOR TO INSTALLATION: RELINING
COMMON VENTED B VENT SYSTEMS

When relining common vented B-Vent (or

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow these installation

instructions could result in personal

injury or death

Table 1

Clearance to Combustibles

Type B Gas Vent Unchanged Unchanged

VENT PIPE ORIENTATION

Vertical Horizontal

3

TYPICAL

COMMON

VENTED

CATEGORY I

INSTALLATION

Figure 1