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[title] Fans Selection
[* black] Use a 12 volt blower fan because tubaxial fans usually lack sufficientwith at least 150 pascal static pressure. We are drawing air in ''through'' a viral filter. Going by just factory spec can be misleading. We must measure flow rate against filter flow resistance.pressure
[* black] Use a 12 volt blower fan because tubaxial fans usually lack sufficientwith at least 150 pascal static pressure. We are drawing air in ''through'' a viral filter. Going by just factory spec can be misleading. We must measure flow rate against filter flow resistance.pressure
[* 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 with 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 suitableideal for smaller<80 kg 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.
[* black] http://d.digikey.com/HS000xU3ppttIK40NAX00T7 Delta BFB0512HHA-CZMQ is lower flow, quieter (20 L/min 55 dBA under HMEF resistance). This fan is suitableideal for smaller<80 kg 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.
[* black] Some fans have 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 changetry other fan model, always verify flow rate against your HMEF's resistance is 20 to 40 L/minL/min and pressure is at least 20 pascal. Larger 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_caution] If you changetry other fan model, always verify flow rate against your HMEF's resistance is 20 to 40 L/minL/min and pressure is at least 20 pascal. Larger 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..