04028DA-12T-AK-H0.
NMB Technologies
AXIAL FAN, 40MM, 12VDC, 36.02CFM, 66.5DB; Supply Voltage VDC:12V; Fan Frame Type:Square; Fan Frame Size:40mm; External Depth:28mm; Bearing Type:Ball Bearing; Air Flow - CFM:36.02CFM; Noise Rating:66.5dBA; Power Rating:18.6W