Scott® AV-2000/3000 SCBA Bayonet to Dual 3M™ Bayonet Adapter
Description
Scott® AV-2000/3000 SCBA Bayonet to Dual 3M™ Bayonet Adapter ==================================================== This prototype design for a Scott® AV-3000 SCBA bayonet to a dual 3M™ bayonet adapter, as requested firefither32. Designed to help cross compatibility of commercial off the shelf (COTS) filters with other manufacturer’s respirators during this PPE shortage. In this particular instance an adapter for self-contained breathing apparatus, that many fire departments use, can now be compatible with 3M™ Filters 2000 Series, 3M™ Filter 7093, 3M™ Cartridges 6000 Series or 3M™ Dual Airline Systems. Part Description: ============= SCOTT_SCBA_BAYONET_TO_DUAL_3M_BAYONET_GEN1.stl Initial model release. SCOTT_AV3000_SCBA_BAYONET_TO_DUAL_3M_BAYONET__INHALATION_GASKET_GEN1.stl Required inhalation gasket to adapt SCBA mask for respirator use. SCOTT_AV3000_SCBA_BAYONET_TO_DUAL_3M_BAYONET_SCOTTGASKET_GEN1.stl Required bayonet gasket to ensure proper seal from adapter to SCBA mask. SCOTT_SCBA_BAYONET_TO_DUAL_3M_ADAPTER_6895_BAYONET_GASKET_GEN2.stl SCOTT_SCBA_BAYONET_TO_DUAL_3M_ADAPTER_EXHALATION_BASE_GASKET_GEN2.stl SCOTT_SCBA_BAYONET_TO_DUAL_3M_ADAPTER_EXHALATION_GASKET_GEN2.stl SCOTT_SCBA_BAYONET_TO_DUAL_3M_ADAPTER_EXHALATION_THREADED_ASYM_GEN2.stl SCOTT_SCBA_BAYONET_TO_DUAL_3M_ADAPTER_EXHALATION_VALUE_COVER_GEN2.stl SCOTT_SCBA_BAYONET_TO_DUAL_3M_ADAPTER_GEN2.stl SCOTT_SCBA_BAYONET_TO_DUAL_3M_ADAPTER_INHALATION_GASKET_GEN2.stl SCOTT_SCBA_BAYONET_TO_DUAL_3M_ADAPTER__BAYONET_GASKET_GEN2.stl Gen. 2 features the following revisions: (1) updated bayonet height to ensure proper fitment against OEM gasket, and (2) incorporated exhalation port and required subassemblies for breathing comfort. Disclaimers/Risks: =============== 1.) This adapter does not feature an SCBA locking mechanism/latch. Since I do not have a Scott AV-3000 SCBA mask for reference, I couldn’t get a good estimate for the locking notch, and conceive of a locking mechanism or interface. Therefore, be sure to continually check to ensure adapter tighten down. User maybe able to shim or stack the bayonet gasket to ensure a tighter fit. 2.) Use Proper Gaskets Requires the 3M™ 6895 Replacement Inhalation Port Gasket, or similar gasket/o-ring, below bayonet to ensure proper seal between cartridge and bayonet. A TPU version can be found here: https://www.thingiverse.com/thing:4268583 Requires inhalation gasket. I do not have a Scott AV-3000 SCBA mask, but based on pictures I did not see an inhalation gasket. Which would make sense for positive pressure system for a self contained breathing apparatus. Therefore to properly function for CBRN use, there should be an inhalation gasket. I’ve included an .STL file for the inhalation gasket to print with TPU. Requires bayonet gasket to seal adapter to SCBA mask. I’ve included an .STL to print with TPU. 3.) 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. 4.) 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 support 3D printing community for any fitment and model revisions. 05/18/2020 - Gen. 2 features the following revisions: (1) updated bayonet height to ensure proper fitment against OEM gasket, and (2) incorporated exhalation port and required subassemblies for breathing comfort based on user feedback. Credits: ====== Thanks to rjcroghan for creating an novel Scott AV-3000 DIY filter assembly. https://www.thingiverse.com/thing:4265991
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