Submittal Sheet

Page 7
Figure 9
V
ENTING SYSTEM CONNECTIONS
Venting system should be installed and supported
in accordance with the National Flue Gas Code
A.N.S.I.Z223.1, or in accordance with any local
codes. A vent pipe connector shall be supported for
the design and weight of the material employed, to
maintain clearances, prevent physical damage and
separation of joints. A vent pipe increaser or
reducer may be required for connecting the power
venter to the vent system. If needed, place the
reducer close to the power venter. Smaller vent
pipe sizes than a chimney-vented system may be
used for the vent system.
If mounting venting system near combustible
materials, refer to Diagram B for allowable venting
system installation clearances. Clearances are
based on an installation using single wall
galvanized steel vent pipe. For metal thickness of
galvanized steel pipe connectors, refer to NFPA
211 or NFPA 54 Standards for guidelines. If
manufactured double wall vent pipe is required or
used for the installation, clearance should be based
on the vent pipes rated clearance. Always check
local code requirements for code restrictions.
Route the vent pipe from the appliance to the power venter using a minimum number of elbows as possible. The horizontal
section of the vent pipe should have a slight upward slope from the appliance to the power venter. For clearances to
combustible materials, multiple appliance venting and other installation requirements, refer to the National Fuel Gas Code
A.N.S.I.Z223.1, and/or any applicable local codes or appliance manufacturer's installation instructions.
C
OMBUSTION AIR SYSTEM CONNECTIONS
1. For appliances constructed with a combustion air inlet connection that do not come equipped with means of either (a)
providing the burner with an alternate source of combustion air in the event of blockage, or (b) safely preventing
combustion in the event of a blockage: install a Field Controls Vacuum Relief Valve, model VRV (sold separately), in
the combustion air piping from the air tee collar to the appliance inlet connection, following the installation instructions
included with the VRV (See Figure 9). This will allow combustion air to be drawn from within the structure (or a safe
shutdown) if the venter inlet becomes blocked.
2. For oil appliances without a combustion air inlet connection, install a Field Controls Airboot, series CAS-2, with the
model appropriate for the particular burner model (see the Field Controls Contractor Reference Guide for instructions
on specifying the Airboot model). A VRV is included with the Airboot and need not be purchased separately.
Diagram B