Master Cool 12VDC FAN, 1.6W 50mm Square x 10mm, Three wire fan for tach, Used Surplus, Ball Bearing, These are an excellent equivalent to the hard to find, 3 wire, Sunon KD1205PFB1
T&T 12VDC .11A , 50mm Square x 10mm, Two Wire Fan, Used Surplus, Ball Bearing,
Y.S. TECH 12VDC FAN 1.56W, 50mm Square x 15mm, Three wire fan for tach, Used Surplus, Ball Bearing,
Dimensions: 50x50x15 MM
Voltage: DC 12V
Current: 0.13A
Input Power: 1.56W
Speed: 4500 RPM
Air Flow: 13.8 CFM
Noise: 30 dBA
Bearing: Ball
Feature: Speed Sensor (Tach Output)