Installation / Operation Instruction Manual
page 4
CAUTION: Failure to install, maintain, and/or operate the power venting system in accordance with
manufacturer's instructions will result in conditions which may produce bodily injury and/or
property damage.
Remove power venter from box and inspect unit for damage. If the carton has been crushed or 1.
mutilated, check unit very carefully for damage. Rotate blower wheel to insure that the motor and blower
wheel rotate freely. DO NOT install if any damage is apparent. Refer to unit sizing chart to check proper
venting sizing.
Location of the termination of the venting system should be installed in accordance with the National 2.
Fuel Gas Code, ANSI Z223.1, and/or manufacturer's recommendations which are applicable. See
requirements below or refer to installation location Diagram A for typical locations.
The exit termination of mechanical draft systems shall not be less than 7' above grade when located a.
adjacent to public walkways.
A venting system shall terminate at least 3' above any forced air inlet located within 10'.b.
The venting system of other than a direct vent appliance shall terminate at least 4' below, 4' c.
horizontally from, or 1' above any door, window or gravity air inlet into the building.
The vent termination of a direct vent appliance with an input of 50,000 BTUs per hour or less, shall be d.
located At least 9" from any opening through which vented gases could enter the building. With an
input over 50,000 BTUs per hour, a 12" termination clearance shall be required.
The vent termination point shall not be installed closer than 3' from an inside corner of an e.
L-shaped structure.
The vent termination should not be mounted directly above, or within 3' horizontally from an oil tank f.
vent or gas meter.
The bottom of the vent terminal shall be located at least 12" above finished grade.g.
EQUIVALENT LENGTH (FEET) OF VENT PIPE
VENT PIPE FITTINGS
VENT PIPE DIAMETER
3" 4" 5" 6" 7" 8" 9" 10"
TEE 19 25 31 38 44 50 56 63
90º ELBOW 5 7 9 11 12 14 16 18
45º ELBOW 3 4 4 5 6 7 8 9
SUDDEN REDUCER
OR INCREASER
FOR THREE RA-
TIOS* (
d
⁄D)
d
⁄D
1
⁄4 8 11 14 17 19 22 25 28
1
⁄2 5 7 8 10 12 13 15 17
3
⁄4 2 3 3 4 4 5 6 6
Figure 2
PROCEDURE FOR CALCULATING TOTAL EQUIVALENT PIPE LENGTH IN FEET
Calculate the total equivalent feet for each type of fitting used in the venting system from the chart below.1.
Calculate the total amount of feet for the straight lengths of vent pipe.2.
Add the equivalent feet for the fittings with the total amount of feet of straight lengths. This will 3.
approximate the total equivalent feet of the vent system.
*Reducer or increaser ratio (d/D) small diameter divided by the larger diameter.
(See Figure 2) 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 1: System Pipe Size = 4"
Step 1 Two 4" 90° Elbows @ 7 feet each = 14 Ft.
Step 2 Ten 2 Foot Lengths of 4" Pipe = 20 Ft.
Step 3 Total Equivalent Feet = 14 Ft. + 20 Ft. = 34 Ft.
Example 2: System Pipe Size =10"
Step 1 Fifteen 2 Foot Lengths of 10" Pipe = 30 Ft.
Step 2 One 10" 90° Elbow = 18 Ft.
Step 3 One 8" to 10" Reducer (Use ¾) = 5 Ft.
Step 4 Total Equivalent Feet = 30 Ft. + 18 Ft. + 5 Ft. = 53 Ft.