Gerson 1745 N95 Respirator with OV-AG Nuisance Relief – Organic Vapor and Acid Gas, Made in USA (Box of 10)

An air-purifying respirator filters air; it does not supply any. Under 29 CFR 1910.134 no filtering facepiece may be used in an atmosphere that is IDLH or oxygen-deficient (below 19.5% oxygen). Those conditions require a supplied-air respirator or an SCBA, and no particulate rating changes that.

Short answer: the Gerson 1745 N95 is a NIOSH-approved N95 filtering facepiece - 95% efficiency against 0.3 micron particles, not resistant to oil aerosols. Buy it when the exposure is particulate and the fit can be verified; skip it when gases or vapours are in play, because a particulate filter does nothing about them.

Who the Gerson 1745 N95 suits

Shoppers reach this listing under several descriptions - as a n95 respirator, as a niosh n95 approval, as a disposable n95, or as a n95 filtering facepiece - and they all mean the same certified device. It suits particulate exposures where the wearer can be fit tested and kept clean-shaven at the seal, and it does not suit gases, vapours, or any job needing more than a factor of ten.

Reading the N95 rating

Under 42 CFR 84 the letter and the number answer different questions. The letter is oil resistance: N not resistant, R resistant for a single shift, P oil proof. The number is filter efficiency against the most-penetrating 0.3 micron particle size: 95, 99, or 100 meaning 99.97%. This model is N95, so not resistant to oil aerosols at 95% efficiency.

Efficiency versus protection factor

A 99.97% filter sounds decisively better than a 95% one, and for the media it is. For the wearer it is not: OSHA 29 CFR 1910.134 Table 1 assigns every filtering facepiece a protection factor of 10 regardless, because what leaks past the seal dominates what passes through the filter. Needing better than 10 means changing class of respirator, not class of filter.

Buy it if / skip it if

Buy it if the hazard is particulate, the wearer is clean-shaven at the sealing surface, and a fit test under 1910.134(f) has been done or can be. Skip it if the atmosphere contains gases or vapours, if the wearer has facial hair crossing the seal, or if the job needs a protection factor above 10. Compare the alternatives across disposable respirators, n95 respirators, respiratory protection.

Methodology: how this listing was built

Class, efficiency and oil resistance are read from the manufacturer's designation and the 42 CFR 84 scheme rather than from marketing copy, and the protection factor is taken from the OSHA table rather than inferred from the filter rating. No laboratory testing is performed for this page.

Without a fit test the rating is theoretical

A respirator that has never been fit tested is a comfort item. 1910.134(f) makes the test mandatory before first use and every year thereafter, tied to the specific size and model - a different size is a different respirator as far as the seal is concerned. The quick check at each donning, under Appendix B-1, is a separate obligation and catches the day-to-day failures the annual test cannot.

Knowing when it is spent

Most disposables are retired for mechanical reasons rather than filter reasons: slack straps, a crushed nose piece, a soiled or damp facepiece, or simply failing the seal check that morning. Rising breathing effort is the filter-loading signal. None of these are fixable - washing destroys the media and stretched straps never recover their tension.

Where this sits in the range

Disposable filtering facepieces are the entry point of respiratory protection, and the step up is not a better disposable but a different class of device. Compare the full disposable range across disposable respirators, n95 respirators, respiratory protection, and where the exposure needs a protection factor above 10 or involves gases, move to full face respirators, flat fold respirators, gerson disposable respirators. Where a chemical is present alongside the particulate, the cartridge families to look at are combination cartridges.

Written by Steven Eaton, WC Safety editor. WC Safety is an independent review site and holds no inventory; Amazon links are affiliate links that earn a commission at no cost to you and do not affect the assessment.

Why the unvalved version exists

An unvalved facepiece filters in both directions. That costs comfort - warmer, damper, and noticeably more effort to exhale across a shift - and buys source control, because nothing leaves the facepiece unfiltered. Where the requirement is only to protect the wearer, the valved version is easier to keep on; where the process or other people also need protecting, this is the one that qualifies.

Nuisance relief is not a chemical filter

This model adds nuisance-level relief for organic vapour or acid gas, and the wording matters more than it looks. Nuisance level means below the permissible exposure limit - the carbon layer is there to take the smell out of air that is already within limits. It carries no NIOSH gas or vapour approval, has no service life you can calculate, and gives no warning when it is spent. If a vapour is present at or above its exposure limit, this is the wrong device and the answer is a cartridge respirator with the correct approval.

Buying in a 10-unit pack

This listing is a 10-unit pack, which matters more than it sounds for a disposable: these are consumed per wearer per shift, so pack size sets how often reordering interrupts the job and whether every worker has a fresh one available at the start of a shift rather than re-using yesterday's. Size the order against headcount and shift pattern, not against unit price.

Class selection is covered in more depth across p95 vs r95 vs p100, best disposable respirator for painting, best n95 for wildfire smoke, 3m 8210 vs moldex 2200n95, 3m 2091 vs 2097, international respirator standards.

Related

• Disposable Respirators
• N95 Respirators
• Respiratory Protection
• Half Mask Respirators
• Full Face Respirators
• Flat Fold Respirators