3M Sealed-Blok User Manual
ANSI Z359.14 Class B
ANSI A10.32
OSHA 1910.140
OSHA 1926.502
1
Sealed-Blok™
SELF-RETRACTING DEVICES
USER INSTRUCTIONS
5903887 Rev. E
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Sealed-Blok™ Cable Retrieval WR L W D
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3400800 9501479
3400801 9501613
3400802 9501613
3400807 9501613
3400825 9501479
3400826 9501613
3400827 9501613
3400833 9501613
3400849 9501613
3400850 9501479
3400851 9501613
3400852 9501613
3400853 9501479
3400857 9501613
3400858 9501613
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30 ft
(9.0 m)
30 ft
(9.0 m)
30 ft
(9.0 m)
30 ft
(9.0 m)
15 ft
(4.5 m)
15 ft
(4.5 m)
15 ft
(4.5 m)
15 ft
(4.5 m)
15 ft
(4.5 m)
30 ft
(9 m)
30 ft
(9 m)
30 ft
(9 m)
30 ft
(9 m)
30 ft
(9 m)
30 ft
(9 m)
10.2 in
(25 cm)
10.2 in
(25 cm)
10.2 in
(25 cm)
10.2 in
(25 cm)
10.2 in
(25 cm)
10.2 in
(25 cm)
10.2 in
(25 cm)
10.2 in
(25 cm)
10.2 in
(25 cm)
11.5 in
(29 cm)
11.5 in
(29 cm)
11.5 in
(29 cm)
11.5 in
(29 cm)
11.5 in
(29 cm)
11.5 in
(29 cm)
(19 cm)
(19 cm)
(19 cm)
(19 cm)
(19 cm)
(19 cm)
(19 cm)
(19 cm)
(19 cm)
(24 cm)
(24 cm)
(24 cm)
(24 cm)
(24 cm)
(24 cm)
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7.6 in
7.6 in
7.6 in
7.6 in
7.6 in
7.6 in
7.6 in
7.6 in
7.6 in
9.4 in
9.4 in
9.4 in
9.4 in
9.4 in
9.4 in
4.3 in
(11 cm)
4.3 in
(11 cm)
4.3 in
(11 cm)
4.3 in
(11 cm)
4.3 in
(11 cm)
4.3 in
(11 cm)
4.3 in
(11 cm)
4.3 in
(11 cm)
4.3 in
(11 cm)
5.4 in
(14 cm)
5.4 in
(14 cm)
5.4 in
(14 cm)
5.4 in
(14 cm)
5.4 in
(14 cm)
5.4 in
(14 cm)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
420 lbs
(189 kg)
© 3M 2020
2
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A B
FC
FC = FF+DD+SF
FF
DD
SF
C
H
FC
2
4
FC
FC
ft (m)
A
(0.0)
(6.1)
(9.1)
(12.2)
(15.2)
V
(18.3)
(21.3)
(24.4)
(27.4)
(30.5)
(33.5)
(36.6)
(39.6)
(42.7)
(45.7)
(48.8)
(51.8)
(54.9)
(57.9)
C
B
0
(0.0)2 (0.6)4 (1.2)6 (1.8)8 (2.4)
0
10
(3)
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
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(2)8 (2.6)
6
(2)
6
(2)
6
(2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)
6
(2)6 (2)6 (2)
6
(2)6 (2)6 (2)
6
(2)6 (2)6 (2)
6
(2)6 (2)6 (2)
û û û û û û û û û
6.2
6.8
(2.1)
(2.3)
6.1
6.4
(2)
(2.1)
6.1
6.3
(2.1)
(2.1)
6.2
(2.1)
6.2
(2.1)
6.1
(2)
6.1
(2.1)
6.1
(2)
6.1
(2.1)
6.1
(2)
6.1
(2.1)
6.1
(2)
6.1
(2.1)
6.1
(2)
6.1
(2.1)
7.7
(2.6)
6.9
(2.3)
6.6
(2.2)7 (2.3)
6.4
(2.1)
6.4
(2.2)
6.3
(2.1)
6.3
(2.1)
6.2
(2)
6.2
(2.1)
6.2
(2)
6.2
(2.1)
6.1
(2)
6.1
(2.1)
6.1
(2)
6.1
(2.1)
6.1
(2)
6.1
(2)
6.1
(2)
6.1
(2)
H
10
12
(3.0)
8.8
û û û û û û
(2.9)
7.5
8.4
(2.5)
(2.7)
7.6
(2.5)
6.8
7.2
(2.2)
(2.4)
6.6
(2.2)7 (2.3)
6.5
6.8
(2.1)
(2.2)
6.5
6.7
(2.2)
(2.2)7 (2.3)
6.4
6.6
(2.1)
(2.2)
6.4
6.6
(2.2)
(2.2)
6.3
6.5
(2.1)
(2.1)
6.3
6.5
(2.1)
(2.2)
6.3
6.4
(2.1)
(2.1)
6.2
6.4
(2.1)
(2.1)
6.2
6.4
(2)
(2.1)
6.2
6.3
(2.1)
(2.1)
6.2
6.3
(2)
(2.1)
6.2
6.3
(2.1)
(2.1)
6.2
6.3
(2)
(2.1)
6.2
6.3
(2.1)
(2.1)
14
(3.7)
(4.3)
9.3
û û û û
(3)
8.3
9.1
(2.7)
(3)
7.8
8.4
(2.5)
(2.7)
7.4
7.9
(2.5)
(2.6)
7.2
7.6
(2.4)
(2.5)
7.4
(2.5)
6.9
7.2
(2.3)
(2.3)
6.8
7.1
(2.3)
(2.4)
6.7
(2.2)7 (2.3)
6.7
6.9
(2.2)
(2.3)
6.6
6.8
(2.2)
(2.2)
6.6
6.8
(2.2)
(2.3)7 (2.3)
6.5
6.7
(2.1)
(2.2)
6.5
6.7
(2.2)
(2.2)
6.4
6.6
(2.1)
(2.2)
6.4
6.6
(2.1)
(2.2)
6.4
6.5
(2.1)
(2.1)
6.4
6.5
(2.1)
(2.2)
16
18
(4.9)
(5.5)
û û û
9.1
9.9
(2.9)
(3.2)
8.5
9.1
(2.8)
(3)
8.1
8.6
(2.6)
(2.8)
7.8
8.3
(2.6)
(2.7)
7.6
(2.5)8 (2.6)
7.4
7.8
(2.5)
(2.6)
7.3
7.6
(2.4)
(2.5)8 (2.6)
7.2
7.5
(2.4)
(2.5)
7.1
7.3
(2.3)
(2.4)
7.2
(2.4)
6.9
7.2
(2.2)
(2.3)
6.9
7.1
(2.3)
(2.4)
6.8
(2.2)7 (2.3)
6.8
(2.3)7 (2.3)
6.7
6.9
(2.2)
(2.2)
6.7
6.9
(2.2)
(2.3)7 (2.3)
20
(6.1)
û
9.9
(3.2)
9.2
(3)
8.8
(2.9)
8.5
(2.7)
8.2
(2.7)
7.8
(2.6)
7.7
(2.5)
7.5
(2.5)
7.4
(2.4)
7.3
(2.4)
7.2
(2.3)
7.2
(2.4)
7.1
(2.3)
5 6
A B C
3
7 8
B
C
A
A
B
B
D
C
B
C
A
A
C
B
B
A
9
1 2
3
4
10
1 2 3
4
11 12 13 14
B B
A A
C C
5A 5B
A
ü û
A
B
C
A
D
5
15 16
B
D
A
A
C
17
A
A
F
E
D
A
F
E
D
D
E
C
B
B
H
G
WARNING
9502313 Rev. D
F G
H
30’ (9 m) SRDs only.
C
6
SAFETY INFORMATION
SIT 5908239 Rev. C
Please read, understand, and follow all safety information contained in these instructions prior to the use of this Self-Retracting
Device (SRD). FAILURE TO DO SO COULD RESULT IN SERIOUS INJURY OR DEATH.
These instructions must be provided to the user of this equipment. Retain these instructions for future reference.
Intended Use:
This Self-Retracting Device is intended for use as part of a complete personal fall protection system.
Use in any other application including, but not limited to, material handling, recreational or sports related activities, or other activities not
described in the User Instructions, is not approved by 3M and could result in serious injury or death.
This device is only to be used by trained users in workplace applications.
! WARNING
This Self-Retracting Device is part of a personal fall protection system. It is expected that all users be fully trained in the safe installation and
operation of their personal fall protection system. Misuse of this device could result in serious injury or death. For proper selection,
operation, installation, maintenance, and service, refer to these User Instructions including all manufacturer recommendations, see your
supervisor, or contact 3M Technical Services.
• To reduce the risks associated with working with an SRD which, if not avoided, could result in serious injury or death:
- Before each use, inspect the SRD and check for proper locking and retraction.
- If inspection reveals an unsafe or defective condition, remove the device from service and repair or replace according to the User
Instructions.
- If the SRD has been subjected to fall arrest or impact force, immediately remove the SRD from service and label the device ‘UNUSABLE’.
- Ensure the lifeline is kept free from any and all obstructions including, but not limited to; entanglement with moving machinery or
equipment (e.g., the top drive of oil rigs), other workers, yourself, surrounding objects, or impact from overhead objects that could fall
onto the lifeline or the worker.
- Never allow slack in the lifeline. Do not tie or knot the lifeline.
- Attach the unused leg(s) of the Harness Mounted SRD to the parking attachment(s) of the harness if equipped.
- Do not use in applications that have an obstructed fall path. Working on slowly shifting material, such as sand or grain, or within conned
or cramped spaces, may not allow the worker to reach sucient speed to cause the SRD to lock. A clear path is required to assure
positive locking of the SRD.
- Avoid sudden or quick movements during normal work operation. This may cause the device to lock up.
- Ensure that fall protection systems/subsystems assembled from components made by dierent manufacturers are compatible and meet
the requirements of applicable standards, including the ANSI Z359 or other applicable fall protection codes, standards, or requirements.
Always consult a Competent and/or Qualied Person before using these systems.
• To reduce the risks associated with working at height which, if not avoided, could result in serious injury or death:
- Ensure your health and physical condition allow you to safely withstand all of the forces associated with working at height. Consult with
your doctor if you have any questions regarding your ability to use this equipment.
- Never exceed allowable capacity of your fall protection equipment.
- Never exceed maximum free fall distance of your fall protection equipment.
- Do not use any fall protection equipment that fails pre-use or other scheduled inspections, or if you have concerns about the use or
suitability of the equipment for your application. Contact 3M Technical Services with any questions.
- Some subsystem and component combinations may interfere with the operation of this equipment. Only use compatible connections.
Consult 3M prior to using this equipment in combination with components or subsystems other than those described in the User
Instructions.
- Use extra precautions when working around moving machinery (e.g. top drive of oil rigs) electrical hazards, extreme temperatures,
chemical hazards, explosive or toxic gases, sharp edges, or below overhead materials that could fall onto you or your fall protection
equipment.
- Use Arc Flash or Hot Works devices when working in high heat environments.
- Avoid surfaces and objects that can damage the user or equipment.
- Ensure there is adequate fall clearance when working at height.
- Never modify or alter your fall protection equipment. Only 3M or parties authorized in writing by 3M may make repairs to the equipment.
- Prior to use of fall protection equipment, ensure a rescue plan is in place which allows for prompt rescue if a fall incident occurs.
- If a fall incident occurs, immediately seek medical attention for the worker who has fallen.
- Do not use a body belt for fall arrest applications. Use only a Full Body Harness.
- Minimize swing falls by working as directly below the anchorage point as possible.
- If training with this device, a secondary fall protection system must be utilized in a manner that does not expose the trainee to an
unintended fall hazard.
- Always wear appropriate personal protective equipment when installing, using, or inspecting the device/system.
EN
7
Before using this equipment, record the product identication information from the ID label in the ‘Inspection and
;
Maintenance Log’ at the back of this manual.
Always ensure you are using the latest revision of your 3M instruction manual. Visit the 3m website or contact 3M
;
Technical Services for updated instruction manuals.
DESCRIPTION:
Figure 2 identies key components of the DBI-SALA® Ultra-Lok™ Self-Retracting Devices (SRDs). Ultra-Lok SRDs are drum
wound Wire Rope Lifelines (A) which retract into a sealed aluminum Housing (B). They can hang from anchorage by a Carabiner
attached through the Swivel Eye (C) on the top of the SRD. A Self-Locking Snap Hook (D) on the end of the Lifeline attaches to
the designated Fall Arrest connection on a Full Body Harness. A Bumper (E), protects the Wire Rope and Ferrules securing the
Snap Hook from abrasion and corrosion.
Figure 1 denes the Ultra-Lok SRD models covered by this instruction manual. The following SRD Types are available:
• Self-Retracting Device (1): Self-Retracting Devices (SRDs) are suitable for applications where the lifeline remains
generally vertical during use and possible Free Fall is limited to 2 ft (0.6 m).
• Self-Retracting Device with Rescue (2): Self-Retracting Devices with Rescue include an integral means for assisted
rescue by raising or lowering the rescue subject. RSRDs are equipped with a 3-Way Emergency Retrieval Hand Crank
(F). Some models include a Tripod Mounting Bracket (G) to mount the SRD on the leg of a Tripod for Conned Space
applications.
Table 1 - Specications
Hook Description Material Gate Strength Throat Size
2000180 Swiveling Self-Locking Snap Hook with Impact
Indicator
2000181 Swiveling Self-Locking Snap Hook with Impact
Indicator
Alloy Steel 3,600 lbs (16 kN) 3/4 in (1.9 cm)
Stainless Steel 3,600 lbs (16 kN) 3/4 in (1.9 cm)
Maximum Arrest Force: 900 lbs (4 kN)
Average Arrest Force: 900 lbs (4 kN)
Maximum Arrest Distance: 42 in (1.1 m)
Average Locking Speed: 4.5 ft/s (1.4 m/s)
Lifeline Material Diameter Minimum Tensile
9501479 Galvanized Steel Wire Rope 3/16 in. (4.76 mm) 4,200 lbs (18.7 kN)
9501613 Stainless Steel Wire Rope 3/16 in. (4.76 mm) 3,600 lbs (16.0 kN)
Strength
8
1.0 APPLICATIONS
1.1 PURPOSE: Self-Retracting Devices (SRDs) are designed to be a component in a personal fall arrest system (PFAS). Figure
1 illustrates SRDs covered by this instruction manual. They may be used in most situations where a combination of worker
mobility and fall protection is required (i.e. inspection work, general construction, maintenance work, oil production,
conned space work, etc.).
1.2 STANDARDS: Your SRD conforms to the national or regional standard(s) identied on the front cover of these
instructions. Refer to the local, state, and federal (OSHA) requirements governing occupational safety for additional
information regarding Personal Fall Protection.
1.3 TRAINING: This equipment is intended to be used by persons trained in its correct application and use. It is the
responsibility of the user to assure they are familiar with these instructions and are trained in the correct care and use
of this equipment. Users must also be aware of the operating characteristics, application limits, and the consequences of
improper use.
1.4 LIMITATIONS: Always consider the following limitations when installing or using this equipment:
• Capacity: SRDs are for use by one person with a combined weight (clothing, tools, etc.) meeting the Capacity Range
specied in Figure 1 for your standard(s). Make sure all of the components in your system are rated to a capacity
appropriate to your application.
• Anchorage: Anchorages selected for fall arrest systems shall have a strength capable of sustaining static loads
applied in the directions permitted by the system of at least:
1. 5,000 lbs. (22.2 kN) for non-certified anchorages, or
2. Two times the maximum arresting force for certified anchorages.
When more than one fall arrest system is attached to an anchorage, the strengths set forth in (1) and (2) above shall
be multiplied by the number of systems attached to the anchorage.
FROM OSHA 1926.502 AND 1910.140: Anchorages used for attachment of personal fall arrest systems shall be
independent of any anchorage being used to support or suspend platforms, and capable of supporting at least 5,000 lbs.
per user attached, or be designed, installed, and used as part of a complete personal fall arrest systems which maintains
a safety factor of at least two, and is under the supervision of a qualied person.
• Locking Speed: Situations which do not allow for an unobstructed fall path should be avoided. Working in confined
or cramped spaces may not allow the body to reach sufficient speed to cause the SRD to lock if a fall occurs. Working
on slowly shifting material, such as sand or grain,may not allow enough speed buildup to cause the SRD to lock. A
clear path is required to assure positive locking of the SRD.
• Free Fall: Properly using an SRD in overhead applications will minimize free fall distance. To prevent an increased free fall
distance, follow the instructions below:
• Never clamp, knot, or otherwise prevent the lifeline from retracting or staying taut.
• Avoid any slack in the lifeline of the SRD.
• Do not work above the level of your anchorage.
• Do not lengthen SRDs by connecting a lanyard or similar component without consulting 3M.
For product-specific information relating to free fall and fall clearance values, please refer to Table 1 of this
instruction.
• Swing Falls: Swing Falls occur when the anchorage point is not directly above the point where a fall occurs. The
force of striking an object in a swing fall may cause serious injury (see Figure 3A). Minimize swing falls by working as
directly below the anchorage point as possible (Figure 3B).
• Fall Clearance: Figure 3B illustrates Fall Clearance Calculation. Fall Clearance (FC) is the sum of Free Fall (FF),
Deceleration Distance (DD) and a Safety Factor (SF): FC = FF +DD + SF. D-Ring Slide and Harness Stretch are
included in the Safety Factor. Fall Clearance values have been calculated and are charted in Figure 4. A Safety Factor
of 1.5 ft (0.45 m) was used for all values in Figure 4.
For falls from a standing position where the SRD is anchored directly overhead (Figure 3B), SRD Fall Arrest Systems
should have the minimum Fall Clearances specied in Table 1. Falls from a kneeling or crouching position will require
an additional 1 m (3 ft) of Fall Clearance. In a swing fall situation (Figure 3C), the total vertical fall distance will be
greater than if the user had fallen directly below the anchorage point and may require additional Fall Clearance.
Figure 4 and the accompanying table dene the Maximum Work Radius (C) for various SRD Anchorage Heights (A)
and Fall Clearances (B). The Recommended Work Zone is limited to the area located within the Maximum Work
Radius.
• Hazards: Use of this equipment in areas where surrounding hazards exist may require additional precautions to
reduce the possibility of injury to the user or damage to the equipment. Hazards may include, but are not limited
to: high heat, caustic chemicals, corrosive environments, high voltage power lines, explosive or toxic gases, moving
machinery, or overhead materials that may fall and contact the user or fall arrest system. Avoid working where your
lifeline may cross or tangle with that of another worker. Avoid working where an object may fall and strike the lifeline;
resulting in loss of balance or damage to the lifeline. Do not allow the lifeline to pass under arms or between legs.
• Sharp Edges: Avoid using this equipment where system components will be in contact with, or scrape against,
unprotected sharp edges and abrasive surfaces.
9
2.0 Use
2.1 FALL PROTECTION AND RESCUE PLAN: The employer must have a Fall Protection and Rescue Plan in place that meets
ANSI Z359.2 Minimum Requirements for a Comprehensive Managed Fall Protection Program. The plan should provide
guidelines and requirements for an employer’s managed fall protection program, including policies, duties and training;
fall protection procedures; eliminating and controlling fall hazards; rescue procedures; incident investigations; and
evaluating program effectiveness.
2.2 INSPECTION FREQUENCY:
3). Additionally, inspections shall be conducted by a competent person3 other than the user. Extreme working conditions
(harsh environment, prolonged use, etc.) may necessitate more frequent competent person inspections. The competent
person shall use the Inspection Schedule (Table 2) to determine appropriate inspection intervals.
are described in the Inspection & Maintenance Log (Table 3). Results of the Competent Person inspection should be recorded
in the Inspection and Maintenance Log or recorded with the Radio Frequency Identification (RFID) system.
2.3 NORMAL OPERATIONS: Normal operation will allow the lifeline to extend and retract with no hesitation or slack as
the worker moves at normal speeds. If a fall occurs, a speed sensing brake system will activate, stopping the fall and
absorbing much of the energy created. Sudden or quick movements should be avoided during normal work operation, as
this may cause the SRD to lock up. For falls which occur near the end of the lifeline travel, a reserve lifeline system or
Energy Absorber has been incorporated to reduce the fall arrest forces.
2.4 BODY SUPPORT: A Full Body Harness must be used with the Self-Retracting Device. The harness connection point must
be above the user’s center of gravity. A body belt is not authorized for use with the Self-Retracting Device. If a fall occurs
when using a body belt it may cause unintentional release or physical trauma from improper body support.
2.5 COMPATIBILITY OF COMPONENTS: Unless otherwise noted, 3M equipment is designed for use with 3M approved
components and subsystems only. Substitutions or replacements made with non approved components or subsystems may
jeopardize compatibility of equipment and may affect safety and reliability of the complete system.
2.6 COMPATIBILITY OF CONNECTORS: Connectors are considered to be compatible with connecting elements when they
have been designed to work together in such a way that their sizes and shapes do not cause their gate mechanisms to
inadvertently open regardless of how they become oriented. Contact 3M if you have any questions about compatibility.
Connectors (hooks, carabiners, and D-rings) must be capable of supporting at least 5,000 lbs. (22.2 kN). Connectors
must be compatible with the anchorage or other system components. Do not use equipment that is not compatible.
Non-compatible connectors may unintentionally disengage (see Figure 5). Connectors must be compatible in size, shape,
and strength. Self-locking snap hooks and carabiners are required. If the connecting element to which a snap hook or
carabiner attaches is undersized or irregular in shape, a situation could occur where the connecting element applies a
force to the gate of the snap hook or carabiner (A). This force may cause the gate to open (B), allowing the snap hook or
carabiner to disengage from the connecting point (C).
2.7 MAKING CONNECTIONS: Snap hooks and carabiners used with this equipment must be self-locking. Ensure all
connections are compatible in size, shape and strength. Do not use equipment that is not compatible. Ensure all
connectors are fully closed and locked. 3M connectors (snap hooks and carabiners) are designed to be used only as
specied in each product’s user’s instructions. See Figure 6 for examples of inappropriate connections. Do not connect
snap hooks and carabiners:
A. To a D-ring to which another connector is attached.
B. In a manner that would result in a load on the gate. Large throat snap hooks should not be connected to standard
size D-rings or similar objects which will result in a load on the gate if the hook or D-ring twists or rotates, unless the
snap hook is equipped with a 3,600 lb (16 kN) gate.
C. In a false engagement, where size or shape of the mating connectors are not compatible and, without visual
conrmation, the connectors seem fully engaged.
D. To each other.
E. Directly to webbing or rope lanyard or tie-back (unless the manufacturer’s instructions for both the lanyard and
connector specically allows such a connection).
F. To any object which is shaped or dimensioned such that the snap hook or carabiner will not close and lock, or that
roll-out could occur.
G. In a manner that does not allow the connector to align properly while under load.
SRDs shall be inspected by the authorized person1 or rescuer2 before each use (See Table
Inspection procedures
Table 2 – Inspection Schedule
Type of Use Application Examples Conditions of Use Inspection Frequency
Infrequent to Light Rescue and Conned Space,
Moderate to Heavy Transportation, Residential
Severe to
Continuous
1 Authorized Person: A person assigned by the employer to perform duties at a location where the person will be exposed to a fall hazard.
2 Rescuer: Person or persons other than the rescue subject acting to perform an assisted rescue by operation of a rescue system.
3 Competent Person: An individual designated by the employer to be responsible for the immediate supervision, implementation, and monitoring of the employer’s
managed fall protection program who, through training and knowledge, is capable of identifying, evaluating, and addressing existing and potential fall hazards, and
who has the employer’s authority to take prompt corrective action with regard to such hazards.
Factory Maintenance
Construction, Utilities, Warehouse
Commercial Construction, Oil and
Gas, Mining
Good Storage Conditions, Indoor or Infrequent
Outdoor Use, Room Temperature, Clean Environments
Fair Storage Conditions, Indoor and Extended Outdoor
Use, All Temperatures, Clean or Dusty Environments
Harsh Storage Conditions, Prolonged or Continuous
Outdoor Use, All Temperatures, Dirty Environment
Annually
Semi-Annually to Annually
Quarterly to Semi-Annually
10
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