Submittal Sheet

Page 5
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Reducer or increaser ratio (d/D) small diameter divided by the larger
diameter. Example 4" to 8" reducer, the reducer ratio is d/D = 4/8 = 1/2.
To estimate the equivalent foot length for the fitting, use the smaller pipe
diameter for the equivalent length figure. Example 4" to 8" reducer; the
reducer ratio is 1/2 and the smaller pipe diameter is 4". So, from the
chart, the equivalent feet would be 7 feet.
Example:
System Pipe Size = 4"
Step 1: 2 - 90° Elbows (4") = 14 Ft.
Step 2: 10 - 2 Ft. Lengths of 4" Pipe = 20 Ft.
Step 3: Total Equivalent Feet = 14 Ft. + 20 Ft. = 34 Ft.
IV. INSTALLATION SAFETY INSTRUCTIONS
CAUTION: This device must be installed by a qualified installer in accordance with the
manufacturer's installation instructions. Appliances should have a minimum of 75% combustion
efficiency or have a maximum measured flue gas temperature of 550°F at the inlet of the venter.
A. The power venting system must be installed by a qualified installer. "Qualified Installer" shall
mean an individual who has been properly trained or a licensed installer. The installer must
write or imprint his name, phone number and date of installation on the installation tag. The
tag should be attached to the power venting system control kit box or venter unit. Recording
burner and venting system initial operational information is recommended as a guide for
service or burner tune-up. Enter this on the back page of this manual.
B. Safety inspection of a venting system should be performed before and after installing a
power venting system on an existing or new appliance. Procedures to follow are those
recommended by the National Fuel Gas Code, A.N.S.I.Z223.1 or refer to the "General
Installation Inspection" section of this manual.
C. Plan the vent system layout before installation to avoid the possibility of accidental contact
with concealed wiring or plumbing inside walls.
D. Single wall vent pipe may be used to join an appliance to the venting system, but if proper
clearances cannot be maintained from combustible materials, Class B Vent Pipe should be
used for gas appliances and Class L Type Vent Pipe for oil appliances. Refer to national or
local codes for guidelines.
E. Disconnect power supply before making wiring connections to prevent electrical shock and
equipment damage.
F. This equipment is designed to overcome minor negative pressure conditions. To ensure
extreme negative pressure does not exist, follow the "General Installation Inspection" section
of this manual.
G. Heating appliances equipped with draft hoods, such as boilers or furnaces, LP and natural
gas appliances SHOULD have a secondary spillage switch installed. On appliances without
draft hoods, it is recommended that the secondary safety switch WMO-1 be installed into the
system. Gas-fired 30 millivolt power systems MUST be equipped with a spillage switch.
H. Air flow adjustment MUST be made to ensure appliance efficiency. This should be done at
the appliance exhaust outlet with a velocity meter, draft gauge or by the "match test
procedure". The match test is in accordance with National Fuel Gas Code A.N.S.I.Z223.1,
Section 8.6.
Typical Pipe Fitting