The Dentec Comfort Air Nx is a reusable elastomeric respirator without an exhalation valve. The product comes in two forms - the Comfort Air Nx, designed for general purpose usage, and the Comfort Air NxMD, designed for usage in healthcare settings. The Comfort Air Nx is one of the first NIOSH-approved respirators without an exhalation valve.
The Comfort Air Nx model has a black facepiece and black N95 cartridges, while the NxMD model is white and has white N95 cartridges. Both models come in small/medium and medium/large sizes (see sizing information). Each model is available in an N95 cartridge and P100 cartridge form, and each of these configurations have been NIOSH-approved (approval # 9355, 9356).
The Dentec Comfort Air Nx is is variation of Dentec's Comfort Air 400 (valved) series. In addition to the exhalation valve-free facepiece, the Comfort Air Nx (95 cartridge version) features N95 cartridges that were designed to decrease breathing resistance, increase audibility of the wearer, and make a user seal check — in lieu of exhalation valve — easier. The N95 cartridges have a dome-like design and have a smaller area to seal (during seal check) versus their N95 cartridges for their valved respirators.
Unlike some of the other (2021) exhalation valve-free NIOSH-approved respirators, the Comfort Air Nx does not even appear to have an exhalation valve. Other NIOSH-approved exhalation valve-free respirators, such as the GVS Elipse P100, use the same facepiece design as their valved version with an internal valve plug. According to Dentec founder Claudio Dente, one of the reasons the white color of the Comfort Air NxMD was chosen was to make the lack of valve more obvious at a glance in a medical setting.
- Official Dentec website for the Dentec Comfort Air NxMD (white, more for healthcare settings) and Comfort Air Nx (black, more for general purpose settings).
- A video outlining some of the features of the Dentec Comfort Air Nx series.
- A video demonstrating the Comfort Air NxMD and other respirators. Features a video of the Comfort Air Nx being worn while talking (at 10:43).
- "Advancements in Elastomeric Respirator Technology for Use as Source Control" - post on the NIOSH science blog about the approval of new exhalation-valve free elastomeric respirators such as the Dentec Comfort Air Nx (March 2021)