![]() The HEADS-UP DISPLAY provides a visual monitor of the air supply with four lights that appear just below the facepiece field of vision. The HEADS-UP DISPLAY is an independent end of service time indicator alarm attached to the facepiece mounted regulator and is standard on respirators required to have two independent redundant alarms. In addition, if the primary air path of the pressure reducer becomes blocked or should fail closed, the secondary air path will automatically begin supplying air to the breathing regulator and the VIBRALERT alarm will be actuated to warn the user of the malfunction. In normal operation, the VIBRALERT alarm vibrates the breathing regulator and facepiece to warn the user by both sound and feel that approximately 33% of full cylinder pressure remains. The VIBRALERT alarm serves two functions: as an end of service time indicator and to alert the user of a malfunction in the dual path pressure reducer. All models of th e AIR-PAK X3 SNAP- CHANGE SCBA respi rator are equ ipped with the VIBRALERT alarm in the facepiece mounted regulator. The open source PAPR was tested for air flow as a function of battery life and was found to meet NIOSH air flow requirements for 4 h, which is 300% over expected regular use.The removable pressure-demand breathing regulator mounts directly to the facepiece and is equipped with an Air Saver/Donning Switch and a red Purge Knob. The open source PAPR has controllable air flow and its design enables breathing even if the fan is disconnected or if the battery dies. The parametric designs allow for adaptation to other core components and can be custom fit specifically to fire-fighter equipment, including their suspenders. The open source PAPR can be fabricated with a low-cost 3-D printer and widely available components for less than $150, replacing commercial conversion kits saving 85% or full-fledged proprietary PAPRs saving over 90%. To assist firefighters and other first responders to use their existing equipment for respiration during the COVID-19 pandemic without using single-use, low-supply, masks, this study outlines an open source kit to convert a 3M-manufactured Scott Safety self-contained breathing apparatus (SCBA) into a powered air-purifying particulate respirator (PAPR). ![]()
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