9 types of disposable respirators that require respirator fit testing | Your Safety Department
There are many types of respirators available to workers which include:
particulate respirators, which filter out airborne particles;
“gas masks,” which filter out chemicals and gases;
airline respirators, which use compressed air from a remote source; and
self-contained breathing apparatus, which include their own air supply.
In this article we will address the disposable filtering facepiece respirator. The entire respirator is discarded when it becomes unsuitable for further use due to excessive resistance, sorbent exhaustion, or physical damage.
Respirators in this family are rated as N, R, or P for protection against oils. This rating is important in our industry because some industrial oils can degrade the filter performance so it doesn’t filter properly. Respirators are rated “N,” if they are Not resistant to oil, “R” if somewhat Resistant to oil, and “P” if strongly resistant (oil Proof). Thus, there are nine types of disposable particulate respirators:
N-95, N-99, and N-100;
R-95, R-99, and R-100;
P-95, P-99, and P-100
Oil aerosols can degrade the performance and efficiency of your mask’s filter media by removing electrostatic charges. Electrostatic charges between the layers of filter media act as a magnet and help trap airborne particles.
R masks (somewhat resistant to oil) are only certified for up to 8 hours of service life, while P (strongly resistant to oil) are certified for up to 40 hours or 30 days of use, whichever comes first.
An N-95 respirator is one of nine types of disposable particulate respirators. Particulate respirators are also known as “air-purifying respirators” because they protect by filtering particles out of the air as you breathe. These respirators protect only against particles—not gases or vapors. Since airborne biological agents such as bacteria or viruses are particles, they can be filtered by particulate respirators.
Respirators that filter out at least 95% of airborne particles during “worse case” testing using a “most-penetrating” sized particle are given a 95 rating. Those that filter out at least 99% receive a “99” rating. And those that filter at least 99.97% (essentially 100%) receive a “100” rating.
NIOSH uses standards to test and approve respirators for occupational uses. NIOSH-approved disposable respirators are marked with the manufacturer’s name, the part number (P/N), the protection provided by the filter (e.g., N-95), and “NIOSH.” This information is printed on the facepiece, exhalation valve cover, or head straps. If a disposable respirator does not have these markings it has not been certified by NIOSH.
A respirator will work only if it is used correctly. Thus the key elements for respiratory protection are fit-testing and training of each worker in the use, maintenance, and care of the respirator. NIOSH considers each of the nine types of disposable particulate respirators to have similar fit characteristics. Therefore, a worker having a NIOSH-approved respirator that fits well is much more important than whether the respirator is an N-95 or one of the other eight types of disposable particulate respirators.
The use of respirators by workers is regulated under the Occupational Safety and Health Administration (OSHA) standard for respiratory protection. The OSHA standard sets requirements for the fit-testing of respirators to ensure a proper seal between the respirator’s sealing surface and the wearer’s face. The OSHA standard also contains requirements for determining that workers can use respirators safely, for training and educating employees in the proper use of respirators, and for maintaining respirators properly. NOTE: Fit-testing and the other OSHA-required procedures are absolutely essential to assure that the respirator will provide the wearer with required protection.
Filtering Facepiece Respirator (FFR) Labels
Individual filtering facepiece respirators are required to have the following markings:
Name of Approval holder/manufacturer business name, a registered trademark, or an easily understood abbreviation of the applicant/approval holder’s business name as recognized by NIOSH. When applicable, the name of the entity to which the FFR has been private labeled by the approval holder may replace the approval holder business name, registered trademark, or abbreviation of the approval holder business name as recognized by NIOSH.
NIOSH in block letters or the NIOSH logo
NIOSH Testing and Certification approval number, e.g. TC-84A-XXXX.
NIOSH filter series and filter efficiency level, e.g. N95, N99, N100, R95, P95, P99, P100
Model Number or part number: The approval holder’s respirator model number or part number, represented by a series of numbers or alphanumeric markings, e.g. 8577 or 8577A.
NIOSH recommends the lot number and/or date of manufacture also be included, however, this is not required.
Filtering facepiece respirators that are private labeled are required to have the following statement on the packaging as a special S caution and limitation statement identified on the full label and located in the respirator user instructions:
Marketed by xxxxxx (the private label company name).
Produced by xxxxxx (the approval holder company name).
This private label related statement does not need to appear on the exterior surface of the respirator as part of the required name marking.
Respirator Fit Testing is required annually | Your Safety Department
Respirators are an important piece of safety equipment that help protect the wearer against a variety of harmful airborne agents. OSHA requires the use of respirators to protect employees from breathing contaminated and/or oxygen deficient air when effective engineering controls are not feasible or are being instituted. But, that doesn't mean just anybody can wear a respirator and in fact there are times when using a respirator for the wrong purpose can lead to a serious injury or death.
Case Study: Many years ago when working as a cargo inspector I boarded a chemical cargo carrier to inspect a vessel tank prior to the loading a chemical which had stringent quality specifications. Confined space activities at that time were not routinely regulated aboard chemical carriers and as a result many cargo inspectors were put in harm's way due to a lack of training on confined space activities, insufficient instrumentation to test the tank atmospheres, insufficient confined space entry permitting processes, and an over-reliance on the vessel crew to support the confined space entry with hole watches and confirmation that the tanks were under breathable air.
The crew of the vessel was from another country and spoke broken English - 1st clue to be careful. I was being rushed by the terminal to conduct the inspection since there is always a need for dock space - 2nd clue to be careful. The vessel was dirty, cluttered, and slippery from prior cargo spills on the deck - 3rd clue to be careful. Something provoked me to conduct a deck level inspection before an entry was attempted. And....I failed the tank as it contained remnants of a prior cargo of kerosene. This was something that would take quite some time to correct and would probably cause the vessel to have to depart the dock. I was reporting this to the supervisor of the terminal when a commotion started on the deck of the vessel. One of the crew had been instructed to enter the tank to start cleaning the prior cargo residue in an attempt to get inspected before the vessel was forced to leave the dock. The crew member had fallen from a ladder inside the tank. It became immediately clear to the crew that the tank, which I was about to enter to inspect a moment ago, was under nitrogen.The crew member had a cartridge respirator on, but cartridge respirators still require breathable air and are the wrong tool to use when entering tanks with deficient air. The rescue was a successful but painful one for the crew member.
When NOT to wear a respirator
1)When you have not had Medical Clearance to wear a respirator. Medical clearance is required through the submission of a Medical Evaluation Questionnaire. This is conducted by a licensed health care professional (PLHCP) to ensure that the wearer has no medical conditions which would preclude the use of a respirator.
2) When you have not been properly trained on the intended use of the respirator, its limitations, how to don and doff the respirator and how to store and maintain the respirator.
3) When you have not been fit tested to the same make, model, and size of the respirator that you will use in the field. These first three items should be conducted together and on an annual basis in order to refresh the training and to ensure a good fitting respirator is available for use.
4) When you do not meet the requirements for achieving a good seal on the respirator i.e. unshaven face, or wearing of articles that could cause gaps in the mask that prevent it from sealing. The hair from an unshaven face is like the prongs on a brush lifting the sealing surface of the respirator up and allowing contaminated air into the breathing zone. Shave at least every 24 hours or earlier if needed.
5) When you do not know the contaminant level you are trying to protect yourself from - wrong cartridge type or limitations on the amount of contaminant levels that the cartridge is intended for. Check the cartridge charts from your PPE supplier to ensure you are using the right cartridges for the job.
6) When you have not replaced the filtering cartridges after reaching its useful life. How many people skimp on this very important step. What is the use of doing all of the above if you fail to change the cartridges because of cost concerns? Change them when due.
7) Do NOT wear a cartridge respirator in a space that is not under breathable air. It was not designed for this. Instead use a Self Contained Breathing Apparatus (SCBA).
Thought Provoking Question 1 - Are there other times when we should NOT wear a respirator that have not been listed above? Please share with our readers.