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KN INSTALLATION INSTRUCTIONS FOR VENT AND AIR PIPING

Vent piped through the roof

(air piped through side wall)

(continued)

Table 2

Vent and air system components

Figure 4

Vent termination minimum clearances

❑

Slope horizontal runs toward the boiler

. All horizontal runs of vent pipe

must slope continuously at least 1/4 inch per foot

(21 mm per meter)

to ensure

condensate drains completely back to the boiler. DO NOT install the vent piping
with any sections that could trap condensate.

2 — Vent piping components

❑

See Table 2 for acceptable vent components.

NO OTHER

vent materials are acceptable.

❑

Carefully follow the instructions supplied by the vent piping manufacturer.

❑

Th e vent joints seal with elastomer rings in the pipe and fi tt ings. Avoid damaging
these seals.

❑

Adjustable lengths of EZ-Seal pipe

— Length adjustments with EZ-Seal piping

are done with slip-fi t adjustable length sections, not by cutt ing the pipe. Make sure
the adjustable length does not jut into elbows or terminations. Th is could block
fl ue gas and condensate fl ow.

❑

Maximum vent piping length

— See the table in Figure 3 for the maximum

allowable length. Each elbow causes the same pressure drop as 10 feet of vent pipe,
so the allowable length reduces 10 feet for each elbow used in the piping. When
45° elbows are used, two 45° elbows are equivalent to one 90° elbow.

❑

Insulate the vent piping where it passes through unheated areas

to prevent

condensate freeze-up.

❑

If the pipe passes through an occupied space, install a chase around the pipe,
following the vent pipe instructions and applicable codes.

❑

Clearance from combustible materials

— Provide minimum clearance to all

combustible materials of at least 2 inches

(51 mm)

❑

Using an existing chimney as a chase

— Th e vent piping can be routed through

an existing STRA

IGHT chimney. DO NOT vent directly into the chimney.

Install the vent piping so it can be inspected aft er installation. Follow vent pipe
manufacturer’s instructions for chimney-as-chase installations.

3 & 4 — Support the vent piping completely

❑

DO NOT use the boiler vent connection to support the vent piping

. Provide

support straps from the ceiling and pedestal supports from the fl oor; utilizing
noncombustible saddle. Th is is required on ALL installations, regardless of the
length of the horizontal piping connected to the boiler.

❑

Install at least one support on every horizontal run

. For horizontal runs

longer than 5 feet

(1.5 m)

, install a support every 3 feet

(0.9 m)

❑

Vent piping cannot be supported from above (such as relying on roof jack sections).
You must install supports on the horizontal piping before the vent turns upward.
Provide a support on the horizontal piping

within 6 inches of every upturned

elbow

to support the vertical run.

❑

Follow the vent pipe manufacturer’s instructions for placement and installation of
supports.

5 — Floor and wall penetrations

❑

Follow applicable codes and the vent pipe instructions to install fi re stops, thimbles
or other devices at all fl oor and wall penetrations.

❑

Provide minimum 2 inches

(51 mm)

clearance to all combustible construction.

6 — Roof penetrations

❑

Follow applicable codes and the vent pipe instructions to install a roof jack, fl ashing
and support. Long extensions of vent pipe above the roof may require the use of
guy supports as specifi ed in the vent pipe instructions.

7 — Rain cap termination

❑

Use only the rain caps listed in Table 2.

❑

Th e rain cap exhaust opening must be at least 2 feet

(0.6 m)

above the highest roof point within 10 feet, as shown in
Figure 3. See the National Fuel Gas Code, ANSI/NFPA 54
for details on pitched roof applications.

❑

See Figure 4 for additional minimum clearances.

KN-2

KN-4

Vent components

Heat-Fab

Vent piping/components
(incl. supports, thimbles, etc.)

EZ-Seal

3-inch

EZ-Seal

4-inch

Rain cap vent termination