Table of Contents
Safety ......................................................... 2
Specifications ............................................. 6
Operation .................................................... 6
SAFETY MAINTENANCEOPERATION
This is the safety alert symbol. It is used to alert you to potential personal injury hazards.
Maintenance ............................................... 7
Parts List and Diagram ............................... 7
Warranty ..................................................... 8
WARNING SYMBOLS AND DEFINITIONS
Obey all safety messages that follow this symbol to avoid possible injury or death.
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
Addresses practices not related to personal injury.
IMPORTANT SAFETY INFORMATION
General Tool Safety Warnings
Read all safety warnings and instructions.
Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.
Save all warnings and instructions for future reference.
Work area safety
1. Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
2. Do not operate tools in explosive atmospheres,
such as in the presence of flammable
liquids, gases or dust. Tools create sparks
which may ignite the dust or fumes.
3. Keep children and bystanders
away while operating a power tool.
Distractions can cause you to lose control.
Page 2 For technical questions, please call 1-800-444-3353. Item 97762
Electrical safety
1. Tool plugs must match the outlet. Never modify
the plug in any way. Do not use any adapter
plugs with grounded tools. Unmodified plugs and
matching outlets will reduce risk of electric shock.
2. Avoid body contact with grounded surfaces
such as pipes, radiators, ranges and
refrigerators. There is an increased risk of
electric shock if your body is grounded.
3. Do not expose tools to rain or wet
conditions. Water entering a tool will
increase the risk of electric shock.
Personal safety
1. Stay alert, watch what you are doing and use
common sense when operating a tool. Do not
use a tool while you are tired or under the
influence of drugs, alcohol or medication.
A moment of inattention while operating tools
may result in serious personal injury.
2. Use personal protective equipment. Always wear
eye protection. Safety equipment such as
dust mask, non-skid safety shoes, hard hat,
or hearing protection used for appropriate
conditions will reduce personal injuries.
4. Do not abuse the cord. Never use the cord for
carrying, pulling or unplugging the power tool.
Keep cord away from heat, oil, sharp edges
or moving parts. Damaged or entangled
cords increase the risk of electric shock.
5. When operating a tool outdoors, use an
extension cord suitable for outdoor use.
Use of a cord suitable for outdoor use
reduces the risk of electric shock.
6. If operating a tool in a damp location is
unavoidable, use a Ground Fault Circuit
Interrupter (GFCI) protected supply.
Use of a GFCI reduces the risk of electric shock.
4. Dress properly. Do not wear loose clothing or
jewelry. Keep your hair, clothing and gloves
away from moving parts. Loose clothes, jewelry
or long hair can be caught in moving parts.
5. Only use safety equipment that has been
approved by an appropriate standards agency.
Unapproved safety equipment may not provide
adequate protection. Eye protection must be
ANSI-approved and breathing protection
must be NIOSH-approved for the
specific hazards in the work area.
SAFETYMAINTENANCE OPERATION
3. Prevent unintentional starting. Ensure the switch
is in the off-position before connecting to
power source, picking up or carrying the tool.
Carrying tools with your finger on the
switch or energizing tools that have
the switch on invites accidents.
Tool use and care
1. Use the correct tool for your application.
The correct tool will do the job better and
safer at the rate for which it was designed.
2. Do not use the tool if the switch does not turn it
on and off. Any tool that cannot be controlled with
the switch is dangerous and must be repaired.
3. Disconnect the plug from the power source
before making any adjustments, or storing
tools. Such preventive safety measures reduce
the risk of starting the tool accidentally.
Service
Have your tool serviced by a qualified repair person
using only identical replacement parts. This will
ensure that the safety of the tool is maintained.
4. Store idle tools out of the reach of children and
do not allow persons unfamiliar with the tool
or these instructions to operate the tool. Tools
are dangerous in the hands of untrained users.
5. Maintain tools. Check for misalignment or
binding of moving parts, breakage of parts
and any other condition that may affect
the tool’s operation. If damaged, have the
tool repaired before use. Many accidents
are caused by poorly maintained tools.
Page 3For technical questions, please call 1-800-444-3353.Item 97762
Ventilator Safety Warnings
1. Connect to GFCI outlet only.
2. Keep children away from ventilator. Small
SAFETY MAINTENANCEOPERATION
fingers can be inserted through grill.
3. Do not use near flammable fumes or dust.
Ventilator has internal arcing parts that
will ignite flammable fumes/dust.
4. Do not use without guard in place.
5. Do not reposition the fan while in use.
6. Unplug after use.
7. Inspect before use; do not use if
parts loose or damaged.
8. Keep inlet and outlet clear during use.
9. Do not allow paper, drapes or other types of loose
material to be drawn into the inlet end of the unit.
Stopping the free movement of air through the
Ventilator will overheat the motor and cause fire.
10. Maintain labels and nameplates on the tool.
These carry important safety information.
If unreadable or missing, contact
Harbor Freight Tools for a replacement.
11. Avoid unintentional starting.
Prepare to begin work before turning on the tool.
12. This product is not a toy.
Keep it out of reach of children.
13. People with pacemakers should consult their
physician(s) before use. Electromagnetic fields in
close proximity to heart pacemaker could cause
pacemaker interference or pacemaker failure. In
addition, people with pacemakers should:
• Avoid operating alone.
• Do not use with power switch locked on.
• Properly maintain and inspect to avoid
electrical shock.
• Properly ground power cord. Ground Fault Circuit
Interrupter (GFCI) should also be implemented
– it prevents sustained electrical shock.
14. WARNING: Handling the cord on this product will
expose you to lead, a chemical known to the State of
California to cause cancer, and birth defects or other
reproductive harm. Wash hands after handling.
(California Health & Safety Code § 25249.5, et seq.)
15. The warnings, precautions, and instructions
discussed in this instruction manual cannot
cover all possible conditions and situations
that may occur. It must be understood by the
operator that common sense and caution are
factors which cannot be built into this product,
but must be supplied by the operator.
SAVE THESE INSTRUCTIONS.
Page 4 For technical questions, please call 1-800-444-3353. Item 97762
Grounding
TO PREVENT ELECTRIC SHOCK AND DEATH FROM INCORRECT GROUNDING
WIRE CONNECTION:
Check with a qualified electrician if you are in doubt as to whether the outlet is properly grounded.
Do not modify the power cord plug provided with the tool. Never remove the grounding prong from
the plug. Do not use the tool if the power cord or plug is damaged. If damaged, have it repaired by a service
facility before use. If the plug will not fit the outlet, have a proper outlet installed by a qualified electrician.
Grounded Tools: Tools with Three Prong Plugs
2. The grounding prong in the plug is connected through
the green wire inside the cord to the grounding
system in the tool. The green wire in the cord must
be the only wire connected to the tool’s grounding
system and must never be attached to an electrically
“live” terminal. (See 3-Prong Plug and Outlet.)
3. The tool must be plugged into an appropriate outlet,
properly installed and grounded in accordance with
3-Prong Plug and Outlet
1. Tools marked with “Grounding Required” have a three
wire cord and three prong grounding plug. The plug
must be connected to a properly grounded outlet.
If the tool should electrically malfunction or break
down, grounding provides a low resistance path to
carry electricity away from the user, reducing the risk
of electric shock. (See 3-Prong Plug and Outlet.)
all codes and ordinances. The plug and outlet should
look like those in the preceding illustration.
(See 3-Prong Plug and Outlet.)
SAFETYMAINTENANCE OPERATION
Extension Cords
1. Grounded tools require a three wire extension cord.
Double Insulated tools can use either
a two or three wire extension cord.
2. As the distance from the supply outlet increases,
you must use a heavier gauge extension cord.
Using extension cords with inadequately sized wire
causes a serious drop in voltage, resulting in loss of
power and possible tool damage. (See Table A.)
3. The smaller the gauge number of the wire, the
greater the capacity of the cord. For example,
a 14 gauge cord can carry a higher current
than a 16 gauge cord. (See Table A.)
4. When using more than one extension cord to make
up the total length, make sure each cord contains at
least the minimum wire size required. (See Table A.)
5. If you are using one extension cord for more
than one tool, add the nameplate amperes
and use the sum to determine the required
minimum cord size. (See Table A.)
7. Make sure the extension cord is properly wired
and in good electrical condition. Always replace
a damaged extension cord or have it repaired
by a qualified electrician before using it.
8. Protect the extension cords from sharp objects,
excessive heat, and damp or wet areas.
TABLE A: RECOMMENDED MINIMUM WIRE
GAUGE FOR EXTENSION CORDS* (120/240 VOLT)
NAMEPLATE
AMPERES
(at full load)
0 – 2.0 18 18 18 18 16
2.1 – 3.4 18 18 18 16 14
3.5 – 5.0 18 18 16 14 12
5.1 – 7.0 18 16 14 12 12
7.1 – 12.0 18 14 12 10 -
12.1 – 16.0 14 12 10 - -
16.1 – 20.0 12 10 - - -
* Based on limiting the line voltage drop to five volts at
150% of the rated amperes.
EXTENSION CORD
LENGTH
25´ 50´ 75´ 100´ 150´
6. If you are using an extension cord outdoors, make
sure it is marked with the suffix “W-A” (“W” in
Canada) to indicate it is acceptable for outdoor use.
Page 5For technical questions, please call 1-800-444-3353.Item 97762
Symbology
SAFETY MAINTENANCEOPERATION
Double Insulated
ETL Standards Association
V~
Volts Alternating Current
Specifications
Electrical Rating 120V~ / 60Hz / 1.4A
Air Flow
Operating Instructions
Read the ENTIRE IMPORTANT SAFETY INFORMATION section at the beginning of this
manual including all text under subheadings therein before set up or use of this product.
A
Amperes
WARNING marking
concerning Risk of Eye Injury.
Wear ANSI-approved safety
goggles with side shields.
Read the manual before
set-up and/or use.
1590 CFM - High
1380 CFM - Low
WARNING marking
concerning Risk of Fire.
Do not cover ventilation ducts.
Keep flammable objects away.
WARNING marking concerning
Risk of Electric Shock.
Properly connect power
cord to appropriate outlet.
Model# STFJ-20N
Tool Set Up
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch of the tool off and unplug the tool from its electrical
outlet before performing any procedure in this section.
Note: For additional information regarding the parts listed in the following pages,
refer to Parts List and Diagram on page 7.
1. Set the Ventilator on a flat, solid surface.
2. Ensure the Inlet and Outlet grills are
firmly and securely in place.
3. Ensure that the switch is in the “OFF”
position before plugging the unit in.
Workpiece and Work Area Set Up
1. Designate a work area that is clean and welllit. The work area must not allow access by
children or pets to prevent distraction and injury.
2. There must not be drapes, paper or other forms
of cloth nearby that could be pulled into the inlet
part of the ventilator obstructing air flow.
3. Route the power cord along a safe route to reach
the work area without creating a tripping hazard or
exposing the power cord to possible damage. The
power cord must reach the work area with enough
extra length to allow free movement while working.
General Operating Instructions
1. Turn the fan on by moving the switch
either to the right, or the left. The positions
are noted next to the switch.
WARNING! Do not reposition the fan while in use.
Page 6 For technical questions, please call 1-800-444-3353. Item 97762
2. To prevent accidents, turn off the ventilator and
disconnect its power supply after use. Clean, then
store the tool indoors out of children’s reach.
REV 12c
Maintenance and Servicing
Procedures not specifically explained in this manual must
be performed only by a qualified technician.
TO PREVENT SERIOUS INJURY FROM ACCIDENTAL OPERATION:
Turn the Power Switch of the tool off and unplug the tool from its electrical
outlet before performing any procedure in this section.
TO PREVENT SERIOUS INJURY FROM TOOL FAILURE:
Do not use damaged equipment. If abnormal noise or vibration
occurs, have the problem corrected before further use.
Cleaning, Maintenance, and Lubrication
SAFETYMAINTENANCE OPERATION
1. BEFORE EACH USE, inspect the general
condition of the tool. Check for:
• loose hardware,
• misalignment or binding of moving parts,
• cracked or broken parts,
• damaged electrical wiring, and
• any other condition that may
affect its safe operation.
Parts List and Diagram
Part Description Qty
1 Safety Grill 2
2 Retaining Nut 1
3 Washer 1
4 Aluminum Fan 1
5 Motor 1
2. AFTER USE, wipe external surfaces
of the tool with clean cloth.
3. WARNING! If the supply cord of this
tool is damaged, it must be replaced only
by a qualified service technician.
Part Description Qty
6 Mounting Bracket 3
7 Handle 1
8 On/Off Switch (2-Speed) 1
9 Case 1
10 Power Cord 1
Record Product’s Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only,
and are not available individually as replacement parts.
Page 7For technical questions, please call 1-800-444-3353.Item 97762
Limited 90 Day Warranty
Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards,
and warrants to the original purchaser that this product is free from defects in materials and workmanship for the
period of 90 days from the date of purchase. This warranty does not apply to damage due directly or indirectly,
to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity, improper
installation, normal wear and tear, or to lack of maintenance. We shall in no event be liable for death, injuries
to persons or property, or for incidental, contingent, special or consequential damages arising from the use of
our product. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the
above limitation of exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with transportation charges
prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise.
If our inspection verifies the defect, we will either repair or replace the product at our election or we may
elect to refund the purchase price if we cannot readily and quickly provide you with a replacement. We will
return repaired products at our expense, but if we determine there is no defect, or that the defect resulted
from causes not within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY DIAGRAM
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR DISTRIBUTOR
MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE OR SHE IS
QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED TO REPLACE
ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY
STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND
LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY
ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS
THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353
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