MSA® Comfo Classic to 40MM NATO (RD40x1/7) Adapter

thingiverse

MSA Comfo Classic to 40MM NATO (RD40x1/7) Adapter ============================================== This prototype design for a MSA Comfo Classic respirator threads directly to 40MM NATO (RD40x1/7/DIN) gas mask thread adapters. Designed to help cross-compatibility of commercial off-the-shelf (COTS) filters with other manufacturers' respirators, during this PPE shortage, should be compatible with any RD40x1/7 filter canisters. If you don't have access to 40MM (RD40x1/7) filters, you can use the following adapters to step down to COTS filter cartridges from these companies below: * 40 MM NATO to 3M Filter Adapter * https://www.thingiverse.com/thing:4245358 * 40MM NATO to Scott 742 Series Filter Adapter * https://www.thingiverse.com/thing:4347531 * 40 MM NATO to MSA Bayonet Filter Adapter * https://www.thingiverse.com/thing:4265715 * 40MM NATO to MSA Comfo Classic Filter Adapter * https://www.thingiverse.com/thing:4267676 * 40MM NATO to Honeywell/Honeywell North Filter Adapter * https://www.thingiverse.com/thing:4268775 * 40MM NATO to Honeywell Sperian Filter Adapter * https://www.thingiverse.com/thing:4342343 * 40MM NATO to MSA Comfo Classic to 40MM NATO (RD40x1/7) Adapter * https://www.thingiverse.com/thing:4253780 Alternatively, if you cannot source COTS filters, search thingiverse, there are a number of other DIY filter cartridge designs to mate to other major manufacturer, 3M/MSA/etc. respirator's attachment system. Part Description: ================ * MSA_COMFO_TO_40MM_NATO_ADAPTER_64.212_DIA_GEN1.stl * Sized based on threads provided from JDMac174, 64.212 mm. * https://www.thingiverse.com/thing:4253780 * MSA_COMFO_TO_40MM_NATO_ADAPTER_64_DIA_GEN1.stl * Sized based on 64 mm DIA threads provided from arkurb. * https://www.thingiverse.com/thing:4259079 Disclaimers/Risks: ================ 1. Use Proper Gaskets: Requires 40 mm OD gasket or o-ring on the interior RD40x1/7 pocket to ensure proper seal maintained between cartridge and threads. 2. Perform Proper Negative Pressure Test: Follow SSPs established by your institution or workplace for further guidance. But in general, don your respirator, adjust straps till taught against face, ensuring no obstructions around the periphery of the seal against face either due from hair, facial hair, or otherwise. Exhale deeply. Cover all inhalation ports. (Typically, most full face or half face respirators have two filters, so cover those intake ports with your hands. If your running only one filter, ensure the opposite port has filter cap in place.) Now inhale deeply. The mask should suck tightly against your face without any air leakages. Re-test if adjustments are required at gasket/o-ring interfaces at the adapter. 3. Use At Own Risk – Temporarily Solution Only Until Supply Chain Normalizes: 3D printing materials are not resistant to many solvents, are water soluble, and degrade when exposed to chemicals, heat, and UV/sunlight. 3D printing this adapter is only a temporarily ad-hoc solution against biological contagions. In addition to using a properly calibrated 3D printer, due to tolerances of adapters, if possible perform hot nozzle pass on all exterior surfaces, to reduce surface porosity. Highly recommended users apply a thin layer of polyurethane clear coat on all exterior surfaces, spray or dip based methods, to help resiliency and durability for repeated sterilization and to reduce fomite transmission in printed infill layers. Once supply chains return to normal, users should purchase OEM OSHA/NIOSH/EN standard approved respirators, adapters and accessories for their institution and workplaces. Dev. Notes: ========== 04/20/2020 - Initial model release. In work, pending 3D printing community support for any fitment and model revisions. Credits: ===== Thanks to JDMac174 for just releasing a original MSA Comfo Classic to 3M bayonet adapter enabling 3D printing community to pull reference MSA threaded geometry, and for akurb for remixing it to fit the older respirator.