The OSHA regulations have long stated this in their own regulations.... until the Plandemic occurred. They use to advise against wearing respirators for more than a short period of time. This has been an OSHA policy since the 1960s and before.

OSHA "updated" their provisions for politically weaponizing it's organization and to be more agreeable (ergo, 'collude') with the CDC. The fact remains that there are no studies that have determined N95 respirators are effective against Covid-19 or any other pathogen. There never was.

The N95 was designed for the coal industry for particulates. If there is any efficacy that the N95 respirator has against Covid-19, it loses this capability within minutes of donning the mask.

Respiratory moisture from exhale, as part of the excretory process, initially traps pathogens, but as the moisture builds up, it soon clogs up the 0.3 micron gaps in the filter. Instead of filtering, the respirator becomes a Petri dish for pathogens. The intake of oxygen becomes more labored for the individual pulling air both from the sealed edges of the mask and pulling pathogen-laced moisture from the fabric of the filter into the lungs. OSHA provides the following caveat in this event.

In the event extended use or reuse of N95 FFRs becomes necessary, the same worker is permitted to extend use of or reuse the respirator, as long as the respirator maintains its structural and functional integrity and the filter material is not physically damaged, soiled, or contaminated (e.g., with blood, oil, paint).

Notice the key words -- "as long as the respirator maintains its structural and functional integrity....".

A moisture-ladened respirator has indeed lost its functional integrity. And becomes a form of self-inflicting waterboarding. The loss of functional integrity is one major reason why respirators are worthless against Covid-19 and other pathogens. This is why wearing them is a matter of minutes, not hours before adverse health effects become evident. Oxygen depletion and inhaling exhaled CO2 leads to deleterious ramifications starting with headaches, light-headedness, heart palpitations, irregular heartbeat, to a compromised immune system.

The CDC does not say this and claim an N95 mask can be worn for "many hours Interrupted. Yet, the CDC have been caught in many LIES and have a history more more concerned about Eugenics than saving lives. After stating the above, the CDC provides this convenient disclaimer:

You need to discard your N95 mask in any of the following situations:

Discard yours after close contact with an environment or area of a patient that is co-infected or infected with the disease. Dispose of your mask if it is contaminated with nasal secretions, respiratory secretions, blood or any other bodily fluid. Get rid of your mask after using it in an aerosol-generating procedure.

Note: N95 masks only need to be worn in a particular context. Wearing it every time or continuously is not recommended. It does more harm than good.

Any business that tells you must wear a face mask is in violation of OSHA safety standards, specifically 29 CFR §1910.134. OSHA Director of Safety Programs stated that the scientific research conducted by OSHA establishes that having an oxygen level below 19.5% may be deadly, or result in organ failure and severe bacterial infections (e.g. pleurisy). Wearing a muzzle immediately reduces oxygen flow well below 19.5%, in clear violation of OSHA safety standards.

29 CFR 1910.146 Paragraph (d)(2)(iii) of the Respiratory Protection Standard states extensively its rationale for requiring that employees breathe air consisting of at least 19.5 percent oxygen. The following excerpt taken from the OSHA preamble and explains the basis for this requirement:

“Human beings must breathe oxygen . . . to survive, and begin to suffer adverse health effects when the oxygen level of their breathing air drops below [19.5 percent oxygen]. Below 19.5 percent oxygen . . . , air is considered oxygen-deficient. At concentrations of 16 to 19.5 percent, workers engaged in any form of exertion can rapidly become symptomatic as their tissues fail to obtain the oxygen necessary to function properly (Rom, W., Environmental and Occupational Medicine, 2nd ed.; Little, Brown; Boston, 1992). Increased breathing rates, accelerated heartbeat, and impaired thinking or coordination occur more quickly in an oxygen-deficient environment. Even a momentary loss of coordination may be devastating to a worker if it occurs while the worker is performing a potentially dangerous activity, such as climbing a ladder. Concentrations of 12 to 16 percent oxygen cause tachypnea (increased breathing rates), tachycardia (accelerated heartbeat), and impaired attention, thinking, and coordination (e.g., Ex. 25-4), even in people who are resting.

At oxygen levels of 10 to 14 percent, faulty judgment, intermittent respiration, and exhaustion can be expected even with minimal exertion (Exs. 25-4 and 150). Breathing air containing 6 to 10 percent oxygen results in nausea, vomiting, lethargic movements, and perhaps unconsciousness. Breathing air containing less than 6 percent oxygen produces convulsions, then apnea (cessation of breathing), followed by cardiac standstill. These symptoms occur immediately. Even if a worker survives the hypoxic insult, organs may show evidence of hypoxic damage, which may be irreversible (Exs. 25-4 and 150; also reported in Rom, W. [see reference in previous paragraph]). https://www.osha.gov/laws-regs/federalregister/1998-01-08

OSHA further states the following: “In some cases, respirator use itself can cause illness and injury to employees. There are a number of physiological burdens that are associated with the use of certain types of respirators. The weight of the respirator, breathing resistances during both normal operation and if the air-purifying element is overloaded, and rebreathing exhaled air from respirator "dead space" can all increase the physiologic burden of respirator use (Exs. 113, 22-1, 64-427). Job and workplace conditions, such as the length of time a respirator must be worn, the level of physical exertion required of a respirator user, and environmental conditions, can also affect the physiological burden (Exs. 113, 64-363). In addition, workers who wear glasses or hearing aids may have problems achieving appropriate fit with some respirator face pieces.” https://www.osha.gov/laws-regs/federalregister/1998-01-08

The above happens as soon as you wear a mask. So, how can the CDC also state: "...an N95 mask can be worn for "many hours Interrupted."? Another highly important thing that you need to know is that every FDA-cleared N95 mask is tagged ”single-use” throwaway gadget. Yet, the CDC recommends limiting the number of N95 reuse to no more than five.