40MM NATO (RD40x1/7) to Honeywell Safety Sperian® /Survivair™ ValuAir® Respirator (Bayonet) Filter Adapter

thingiverse

This prototype design makes any RD40x1/7 threaded full face CBRN masks compatible with legacy Honeywell Safety Sperian / Survivair ValuAir bayonet series line of chemical, combination, and particle filter cartridges to help mitigate PPE shortages by expanding greater cross compatibility of respirators and filters to other manufacturer models. Part Description: ============ 40MM NATO TO HONEYWELL SPERIAN VALUAIR ADAPTER GEN1 STL Initial model release. Disclaimers/Risks: ============== 1.) Use Proper Gaskets Use OEM gasket under bayonet or similar nominal OD of 25.5 mm. 2.) Perform Proper Negative Pressure Test Follow SSPs established by your institution or workplace for further guidance. 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. Inhale deeply. The mask should suck tightly against your face without any air leakages. 3.) Use At Own Risk – Temporarily Solution Only Until Supply Chain Normalizes 3D printing materials are not resistant to many solvents, degrade when exposed to chemicals, heat, and UV/sunlight. 3D print this adapter as a temporarily ad-hoc solution against biological contagions. Perform hot nozzle pass on all exterior surfaces, to reduce surface porosity. 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. Dev. Notes: ========== 5/07/2020 - Initial model release. In work, pending 3D printing community support for any fitment and model revisions. Credits: ======= Thanks to NoSiGnAl-H3 for the Honeywell ValuAir adapter to TentaCat0702 MK2 design. Used images and his ID/OD and depth dimensions to extrapolate the respirator side attachment geometry. https://www.thingiverse.com/thing:4334272