AOSafety® Thread to 40MM NATO (RD40x1/7) Adapter

thingiverse

AOSafety Thread to 40MM NATO (RD40x1/7) Adapter ============================================ This prototype design for a threaded respirator to 40MM NATO (RD40x1/7/DIN) gas mask thread adapter is created to help cross compatibility of commercial off the shelf (COTS) filters with other manufacturer's respirators, during this PPE shortage. This should be compatible with any RD40x1/7 filter canisters. If you do not have access to 40MM (RD40x1/7) filters, 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:4297348 40MM NATO to Honeywell Safety Sperian /Survivair ValuAir (Bayonet) Filter Adapter https://www.thingiverse.com/thing:4345345 40MM NATO to AOSafety Threaded Filter Adapter https://www.thingiverse.com/thing:4273365 40 MM NATO to AOSafety R5700 8051 Bayonet Filter Adapter https://www.thingiverse.com/thing:4265538 40MM NATO to Portwest Bayonet Filter Adapter https://www.thingiverse.com/thing:4273389 40MM NATO to Moldex Bayonet Filter Adapter https://www.thingiverse.com/thing:4273391 Alternatively, if you cannot source COTS filters, search thingiverse for DIY filter cartridge designs to mate to other major manufacturer respirators' attachment system. Part Description: ============ AOSAFETY_THREAD_TO_40MM_NATO_ADAPTER_GEN2.stl Sized based on threads provided from cwmendel in his AOSafety to 3M bayonet adapter: https://www.thingiverse.com/thing:4205509 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: ========== 04/21/2020 - Initial model release. In work, pending 3D printing community support for any fitment and model revisions. Credits: ===== Thanks to cwmendel for releasing an AOSafety to 3M bayonet adapter for reference AOSafety male side threads.