Install Instructions

2
Type B Gas Vent - 3" to 12" Diameter
Installation Instructions
• Portions of gas vents that may pass through
accessible spaces must be enclosed to prevent
personal contact with and possible damage to the
vent. The enclosure also may have to meet fire-
resistance rating provisions. See all local and
national codes that may apply.
• Unenclosed outside vents below the roofline are
prohibited.
• No damper or other restriction is permitted in a gas
vent.
• Single-wall connectors and stovepipes may be used
with Hart & Cooley Type B vent with the following
considerations: The use of single-wall materials
cause higher heat loss from the flue products, which
in turn reduce the draft and may cause condensation
to occur.
(A) Since the heat loss from single-wall pipe is
double that from Hart & Cooley pipe, be sure to
use the capacity table for single-wall connector.
(B) Observe the local requirements for clearance to
combustibles for single-wall pipe. This distance
is 6" to 9" in most areas.
(C) Do not run single-wall connectors through
unheated spaces, partitions, or in concealed
areas.
Step-by-step installation procedure
Assembly of the vent
• Appliances to be vented should be placed as close
as possible to the point where the vent is to run
vertically up through the building.
• Install the support assembly (RSA). A support
assembly is recommended for all installations for the
following reasons.
(A) It allows installation of the vent system prior to
installation of appliances.
(B) It allows disconnection of the appliance for
service at any time without disturbing or
temporarily supporting the vent.
(C) It provides the required firestop as well as
support.
(D) It is UL-listed.
Figure 1
Figure 1 shows the
installation of an RSA
support assembly.
Figure 2 shows an RSA vent support
installation in floor or ceiling joists or
rafters of a flat roof.
Figure 2
Figure 3 shows an RSA
vent support using a
wall bracket (by others).
Figure 3
The support assembly shall be installed in the
following manner. Frame an opening between
standard 2" joists, either on 16" or 32" centers,
depending on vent dimension, with headers of the
same dimension lumber as the joists (Figure 2) or on
the wall studs with 2x4’s as in Figure 3. The opening
must be square and level on the bottom side. Place
the support plate up into the opening with flanges tight
against the underside of the framing. Nail in place
with two 8d nails on each side through the holes
provided.