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Edit by Guy Kuo

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[title] Fans TestedSelection
[* black] Use a 12 volt blower fan because tubaxial fans usually lack sufficient flow against resistancestatic pressure. We are drawing air in ''through'' a viral filter. Going by just factory spec can be misleading. Those are for static pressure (zero flow) and free air max CFM (zero resistance). We We must measure flow rate against HMEFfilter flow resistance.
[* black] My original recommended NMB Technlogies BM5115-04W-B50-L00 blower fan static pressure of 0.803 in H2O (200.0 Pa) provided ample airflow (30 L/min at 64 dBA noisewith Intersurgical Hydromax HMEF) . However, this fan is now sold out.
[title] Fans TestedSelection
[* black] Use a 12 volt blower fan because tubaxial fans usually lack sufficient flow against resistancestatic pressure. We are drawing air in ''through'' a viral filter. Going by just factory spec can be misleading. Those are for static pressure (zero flow) and free air max CFM (zero resistance). We We must measure flow rate against HMEFfilter flow resistance.
[* black] My original recommended NMB Technlogies BM5115-04W-B50-L00 blower fan static pressure of 0.803 in H2O (200.0 Pa) provided ample airflow (30 L/min at 64 dBA noisewith Intersurgical Hydromax HMEF) . However, this fan is now sold out.
[* black] San-Ace 109BC12GC7-1 https://www.digikey.com/product-detail/en/sanyo-denki-america-inc/109BC12GC7-1/1688-1035-ND/6191751 is good alternative if user needs higher flow (33 L/min, 60 dBA against HMEF)
[* black] Sunon MF50151VX-B00U-A99 is also good fan for BunnyPAPR. (33 LPM , 63 dBA) Same flow as San-Ace, slightly louder, but lower cost. https://www.digikey.com/product-detail/en/sunon-fans/MF50151VX-B00U-A99/259-1829-ND/7691033
[* black] http://d.digikey.com/HS000xU3ppttIK40NAX00T7 Delta BFB0512HHA-CZMQ is lower flow, quieter (20 L/min 55 dBA under HMEF resistance). This fan is suitable for smaller users. Its mounting holes must be enlarged for 3 mm bolts. I have worn this in OR for 11 continuous hours. Steady state EtCO2 was 40 with this fan and Intersurgical Hydroguard Mini.
[* icon_caution] PLEASE DO NOT HORDE FANS. Only obtain the number you will actually ''deploy'' to providers. Hording deprives others in need during this COVID-19 crisis.
[*
black] Other blowerSome fans may yield more ideal combination of power draw, static pressure, flow rate, noise, and availability. 200 to 250 Pascale static pressure capability is likely best rangehave correct looking specs but falter during testing. For instance, Mechatronix B5015E12B-BSR achieved only 22 LPM but was a loud 65 dBA.
[* icon_caution] If you change fan model, always verify flow rate against your HMEF's resistance is 20 to 3540 L/min. CheckLarger users will need 30 L/min. Check EtCO2 levels via gas sampling for at least 20 minutes to verify steady state value < 42 mm Hg..
[* icon_note] Flows cited above are against a Intersurgical hydrogaurd mini. That HMEF has a spec flow resistance of 2.9 cm H2O at 60 LPM
[* icon_caution] PLEASE DO NOT HORDE FANS. Only obtain the number you will actually ''deploy'' to providers. Hording deprives others in need during this COVID-19 crisis.
[*
black] Other blowerSome fans may yield more ideal combination of power draw, static pressure, flow rate, noise, and availability. 200 to 250 Pascale static pressure capability is likely best rangehave correct looking specs but falter during testing. For instance, Mechatronix B5015E12B-BSR achieved only 22 LPM but was a loud 65 dBA.
[* icon_caution] If you change fan model, always verify flow rate against your HMEF's resistance is 20 to 3540 L/min. CheckLarger users will need 30 L/min. Check EtCO2 levels via gas sampling for at least 20 minutes to verify steady state value < 42 mm Hg..
[* icon_note] Flows cited above are against a Intersurgical hydrogaurd mini. That HMEF has a spec flow resistance of 2.9 cm H2O at 60 LPM

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