3M 7500 internal exhalation filter
thingiverse
Internal exhalation filter for 3M 7500 series re-usable respirator. Exhaled air now filtered and thus can be used in sterile surgical field. Filter box has an attachment that latch into the hole inside the respirator. Breathing should be easier as the filter area is larger than other external filter adapters for 7500 series published in Thingiverse. Installation as per photo. Disclaimer: Use at own risk
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