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NEW! COVID-19 Products

  • Mask shown next to product packaging.
  • Outside of mask.
  • Inside of mask
  • Dimensional picture. Weight 0.45 oz, 5" h x 6" l.

N99 NIOSH-Approved Particulate Respirators w/ Exhalation Valve, 12/pkg

Item #: 11155

Availability: 1-2 business days

Product Description


IN STOCK for immediate shipment from NJ.

We also have US-made NIOSH-approved N95's in stock (see item # 11165). To be put on a notification list for updates on our mask availability, please contact us by email.

Bielcor's B300 advanced particulate filtering N99 dust masks are NIOSH-approved (approval number 84A-3907) and are designed to protect the wearer against non-oil-based particles as small as 0.3 microns, while still allowing the user full, deep breaths of clean, fresh air. Each has a flexible, adjustable metal nose piece that can be bent or shaped to ideally fit the user's face. The exhalation valve reduces excessive dampness and warmth in the mask from exhaled breath, making long-term wear much more comfortable. The flexible head strap allows the user to don and remove the mask with ease. These are readily compatible with other Personal Protective Equipment (PPE) such as safety glasses, goggles, earmuffs, and hardhats and the straps are latex-free.

These masks are ideal for protection against small particulates such as saw dust, metal shavings, pollen, allergens, fiberglass, and more. They are ideal for activities such as woodworking or painting at home as well as by professional carpenters, contractors, or lawn care specialists.  N99 filtering respirators are even more efficient than N95 respirators, filtering at least 99% of airborne particles. These are not resistant to oil.  NIOSH has a convenient discussion of particulate filtering respirator classifications on their web site. 

Technical Note 1: The US Centers For Disease Control and Prevention (CDC) has recently updated its guidance regarding valved masks for source control. Their earlier FAQ question about using respirators with an exhalation valve notes that one can use a surgical mask over such valves where exhalation is a concern. 

Technical Note 2: Respirators with KN designations such as KN95 are not NIOSH-approved. While the US FDA has issued an Emergency Use Authorization for unapproved respirators under certain conditions, the market for KN95's is fraught with substandard and counterfeit products and  should be considered only when approved alternatives are unavailable. A recent study by ECRI determined that up up to 70% of  imported non-NIOSH certified respirators exhibit filtration performance "significantly inferior" to NIOSH-certified N95's.

Technical Note 3: NIOSH has issued Recommended Guidance for Extended Use and Limited Reuse of N95 Filtering Facepiece Respirators in Healthcare Settings which health care institutions will find useful. The US FDA has issued Emergency Use Authorizations for the use of hydrogen peroxide vapor systems to sterilize and reuse personal respiratory protective devices.

Technical Note 4:  Bielcor is an Arizona-based company that has been operating in the US occupational respiratory market for more than two years. These masks are manufactured by Taiwan-based Jinfuyu Industrial Co, Ltd which holds the NIOSH approval and has factories in both China and Vietnam. These masks have a three shelf life and come with a dates of manufacture/expiration on them. We promise to ship masks that have at least two years remaining before expiration.


Case dimensions: 26" x 18" x 11" (66.0 x 45.7 x 27.9 cm), 14 lb (6.35 kg).


Product Reviews

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  1. Rip Off 1 Star Review

    Posted by on Aug 23rd 2020

    I see you only post the good reviews. If I am wrong than I expect to see my post.

    Don’t waste your money. After weeks of waiting they arrived and do not fit an adult. Unlike other vendors this outfit does not back their products with a guarantee for their customers.

    Safety Emporium responds:

    No, we post our reviews. You are wrong.

    As we informed this customer by email, we have sold over 10,000 boxes of this one-size fits most mask. While we have had several customers report that they found the mask too large, this was the first report from anyone that the masks are too *small*. The size is clearly shown in the product picture (6 inches wide x 5 inches high), which is comparable to other brands such as the 3M 8200 series of masks.

    We do not accept returns on PPE given hygienic and other issues too detailed to list here. We make this quite clear on the product page in bold red type. It is printed on the electronic order acknowledgment if you missed that. For other product lines we have a 30 day return policy on most items.


    Posted by on May 31st 2020

    The masks are genuine N99 NIOSH approved. We are EFR's / Rescue Divers with a small underwater rescue company and having high quality respirators when we are topside are vital to our crew. Thank you Safety Emporium for such great product.

  3. Great Product Great Service 5 Star Review

    Posted by on May 24th 2020

    It was great to be able to find these N99 mask for my small health center. Fast shipping, fair pricing and immediate response to emails and phone calls. Thanks and looking forward to ordering from again.

  4. Wonderful service and great product 5 Star Review

    Posted by on May 19th 2020

    We ordered these masks for a medical practice and they've been great. Slightly harder to breathe in than an N95, but that's to be expected, since this has a higher particulate filter count. Customer service was great, we explained that these masks were for medical use and they expedited the shipping. We're so thankful to have found a reliable company with fair pricing during the pandemic. Thanks Safety Emporium!

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