Scott® 742 Series, Promask 25, Xcel™, and Scott Quarter Turn Bayonet to 40MM NATO (RD40x1/7) Adapter

thingiverse

Scott 742 Series, Promask 25, Xcel, and Scott Quarter Turn Bayonet to 40MM NATO (RD40x1/7) Adapter This prototype design for a Scott 742 Series, Promask 25, Xcel, and Scott Quarter Turn bayonet non-disposable respirator to 40MM NATO (RD40x1/7") gas mask thread adapter is designed to help cross compatibility of commercial off the shelf (COTS) filters with other manufacturer's respirators during this global PPE shortage. Designed to make Scott 742 Series bayonet series respirators compatible with any RD40x1/7" threaded canisters or step down adapters to other respirator manufacturer filter cartridges. If you cannot source 40MM NATO (RD40x1/7") thread filters, then you can step down to the following adapters 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 40 MM 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 40 MM NATO to 3M Filter Adapter https://www.thingiverse.com/thing:4245358 40MM NATO to MSA Bayonet Filter Adapter https://www.thingiverse.com/thing:4265715 Part Description: =============== SCOTT_742_BAYONET_TO_40MM_NATO_ADAPTER_GEN1.stl Initial model release. Disclaimers/Risks: ================ 1.) Use Proper Gaskets Requires 40 mm OD gasket or o-ring on the interior pocket for RD40x1/7 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: ========== 05/08/2020 - Initial model release. In work, pending 3D printing community support for any fitment and model revisions. Credits: ======= Thanks to tobias1pl for the Scott 742 adapter for DIY cotton pads design. Used images and his ID/OD and depth dimensions to extrapolate the filter side attachment geometry. https://www.thingiverse.com/thing:4334140