Empire Comfort Systems CIBV-30-2 Owner's Manual download pdf (Page 23)

15628-9-1007 Page 23

Vertical Terminations (Figures 30, 31 and 32)

Locate and mark the center point of the venting pipe. Using a nail

on the underside of the roof and drive this nail through this center

point. Make the outline of the roof hole around this center point.

NOTE: Size of the roof hole dimensions depend on the pitch of

the roof. There must be a 1 inch clearance (25mm) to the

vertical pipe sections. This clearance is to all combustible

material.

Cover the opening of the vent pipe and cut and frame the roof hole.

Use framing lumber the same size as the roof rafters and install the

frame securely. Flashing anchored to frame must withstand high

winds. The storm collar is placed over this joint to make a water-

tight seal. Non-hardening sealant should be used to completely seal

this ﬂashing installation.

Determining Minimum Vent Height Above the Roof.

WARNING: Major U.S. building codes specify minimum

chimney and/or vent height above the roof top. These minimum

heights are necessary in the interest of safety. These speciﬁcations

are summarized in Figure 30.

Figure 30

Note that for steep roof pitches, the vent height must be increased.

In high wind conditions, nearby trees, adjoining roof lines, steep

pitched roofs, and other similar factors can result in poor draft,

or down-drafting. In these cases, increasing the vent height may

solve this problem.

When terminating the vent cap near an exterior wall or overhang,

maintainn minimum clearances as shown in Figure 31.

General Maintenance

Conduct an inspection of the venting system semi-annually.

Recommended areas to inspect are as follows:

1. Check areas of the venting system which are exposed to the

elements for corrosion. These will appear as rust spots or

streaks and, in extreme cases, holes. These components should

immediately be replaced.

2. Remove the cap and shine a ﬂashlight down the vent. Remove

any bird nests or other foreign material.

3. Check for evidence of excessive condensate, such as water

droplets forming in the inner liner and subsequently dripping

out at joints. Continue condensate can cause corrosion of caps,

pipe and ﬁttings. It may be caused by having excessive lateral

runs, too many elbows and exterior portions of the system being

exposed to cold weather.

4. Inspect joints to verify that no pipe sections or ﬁttings have been

disturbed and, consequently, loosened. Also, check mechanical

supports, such as wall straps or plumbers' tape for rigidity.

Venting terminal shall not be recessed into a wall or siding.

A removable panel or other means must be provided in the enclosure

for visual inspection of the ﬂue connection.

Installing the Vent System in a Chase

A chase is a vertical box like structure built to enclose the gas appliance

and/or it's vent system. Vertical vent runs on the outside of a building

may be, but are not required to be installed inside a chase.

When installing a direct vent gas appliance in a chase, it is always

good building practice to insulate the chase as you would the outside

wall of your home.

Figure 32

CAUTION: Treatment of ﬁrestop spacers and construction of

the chase may vary with the type of building. These instructions

are not substitutes for the requirements of local building codes.

Therefore, your local building codes must be checked to determine

the requirements for these steps.

VERTICAL TERMINATION

Figure 31

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 39 40

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Empire Comfort Systems CIBV-30-2 Owner's Manual Page 23

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