Speed controlling computer fans
For years I have been using the Silverstone fm121 as it comes with a remote mounted speed controlling potentiometer, goes as high as 110 CFM and 0.4 amps consumption. It is fairly quiet for this am...
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Had black appliance epoxy on the shelf already. It has proven durable on my rigs Steel rims.
This time with the latest 180mm SS fan, I wetsanded the impeller with water with a drop of dawn dishsoap and 1500 grit sandpaper, got all oils off. No fisheyes or separation on appliance epoxy paint application. Wiping with alcohol was not enough on previous impeller.
. I still have impeller & ball bearings from failed ap182. I also cut off the spiral focusing faceplate to use in front of newer slower 180mm Silverstone fan as a finger grate, more than a flow focuser.
I currently have a 110 CFM silverstone fm121 on my Ceiling exhausting through a 4 inch opening into a mushroom vent. The fan is fed, Inline, from 1/4 inch away, by a counter rotating single speed 53cfm 120MM arctic cool fan which greatly improves airflow, and noise. The pitch of the SS fan on high is lowered greatly when the counter rotating fan is fired up, pushing air into the SS fan.
The mushroom vent certainly presents a lot of resistance to airflow. I have opened up the interior to present less resistance, but perhaps This Ceiling silverstone can find its way onto my intake shroud, since I know it is quiet enough for that location.
perhaps The Noctua, since it has a much higher static pressure rating would be much better exhausting through this mushroom vent on my ceiling.
The old airflow vs static pressure war.
Ideally The screaming banshee fan could reside pushing air through the mushroom vent, if it could be adequately tamed.
I wonder how the Static pressure rating of Computer fans is measured, and if the published numbers are valid when compared among different brands.
The 2000 rpm nf-f12 has a SP rating of 3.94mm and 71.69cfm for 29.7dba
the 3000 rpm nf-f12 has a SP rating of 7.63MM and 109.9 cfm for 43.5dba
the 2400 rpm FM121 has a Sp rating of 3.26mm and 110.03cfm for 39.5dba
The Delta 6000rpm has a Sp rating of 35.887 and 252CFM for 66.5dba
So understanding how static pressure is measured on these computer fans could have a huge effect if the 2000 rpm Noctua could, based on the SP stats, outperform the faster louder higher CFM higher amp draw silverstone fm121 when exhausting though my mushroom vent as it has a higher SP rating.
I did once mount the Delta 252 CFM 35.887MM Static pressure screaming banshee Fan to my ceiling vent for an hour. The counter rotating inline feeder fan actually slowed down the screaming banshee and reduced airflow. Its scavenging ability was unmatched and dang impressive. Like closing all the doors and opening one window and putting this fan on high, the airflow coming through the open window was still impressive. but the noise... a high pitched jet engine, and the amp draw, 3.23 amps.
This time with the latest 180mm SS fan, I wetsanded the impeller with water with a drop of dawn dishsoap and 1500 grit sandpaper, got all oils off. No fisheyes or separation on appliance epoxy paint application. Wiping with alcohol was not enough on previous impeller.
. I still have impeller & ball bearings from failed ap182. I also cut off the spiral focusing faceplate to use in front of newer slower 180mm Silverstone fan as a finger grate, more than a flow focuser.
I currently have a 110 CFM silverstone fm121 on my Ceiling exhausting through a 4 inch opening into a mushroom vent. The fan is fed, Inline, from 1/4 inch away, by a counter rotating single speed 53cfm 120MM arctic cool fan which greatly improves airflow, and noise. The pitch of the SS fan on high is lowered greatly when the counter rotating fan is fired up, pushing air into the SS fan.
The mushroom vent certainly presents a lot of resistance to airflow. I have opened up the interior to present less resistance, but perhaps This Ceiling silverstone can find its way onto my intake shroud, since I know it is quiet enough for that location.
perhaps The Noctua, since it has a much higher static pressure rating would be much better exhausting through this mushroom vent on my ceiling.
The old airflow vs static pressure war.
Ideally The screaming banshee fan could reside pushing air through the mushroom vent, if it could be adequately tamed.
I wonder how the Static pressure rating of Computer fans is measured, and if the published numbers are valid when compared among different brands.
The 2000 rpm nf-f12 has a SP rating of 3.94mm and 71.69cfm for 29.7dba
the 3000 rpm nf-f12 has a SP rating of 7.63MM and 109.9 cfm for 43.5dba
the 2400 rpm FM121 has a Sp rating of 3.26mm and 110.03cfm for 39.5dba
The Delta 6000rpm has a Sp rating of 35.887 and 252CFM for 66.5dba
So understanding how static pressure is measured on these computer fans could have a huge effect if the 2000 rpm Noctua could, based on the SP stats, outperform the faster louder higher CFM higher amp draw silverstone fm121 when exhausting though my mushroom vent as it has a higher SP rating.
I did once mount the Delta 252 CFM 35.887MM Static pressure screaming banshee Fan to my ceiling vent for an hour. The counter rotating inline feeder fan actually slowed down the screaming banshee and reduced airflow. Its scavenging ability was unmatched and dang impressive. Like closing all the doors and opening one window and putting this fan on high, the airflow coming through the open window was still impressive. but the noise... a high pitched jet engine, and the amp draw, 3.23 amps.
