Honeywell/Honeywell North® (~M26x1.55) Coupler Set

thingiverse

Honeywell/Honeywell North® (~M26x1.55) Coupler Set ================================ This prototype design for a Honeywell/Honeywell North® (~M26x1.55) threaded coupler set, for male to female or female to male; male to male; and female to female couplings. Also a place holder for other straight walled or barbed adapters to or from the Honeywell threaded line of filter cartridges. 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 for PAPR (Powered-Air Purifying Respirator) hose compatibility or ventilator system expansion. Part Description: ============= FEMALE_TO_FEMALE_HONEYWELL_M25.889X1.554_COUPLER_GEN1.stl MALE_TO_FEMALE_HONEYWELL_M25.889X1.554_COUPLER_GEN1.stl MALE_TO_MALE_HONEYWELL_M25.889X1.554_COUPLER_GEN1.stl Initial model release of three-part Honeywell/North® coupling set. MALE_HONEYWELL_M25.889X1.554_TO_19MM_OD_STRAIGHT_WALLED_ADAPTER_GEN1.stl MALE_HONEYWELL_M25.889X1.554_TO_19MM_OD_BARBED_ADAPTER_GEN1.stl Released Honeywell ~M26x1.55 male thread to 19mm OD straight walled and barbed couplers as requested by derekrwhite for his low cost ventilator design. https://cheapventilator.org Disclaimers/Risks: ============= 1.) Use Proper Gaskets Ensure proper seal maintained between adapters via use of Teflon tape or gaskets at bottom of threaded pockets. 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: ========= 05/06/2020 - Initial model release. In work, pending support 3D printing community for any fitment and model revisions.