散热风扇的规格尺寸有多种，以下是一些常见的尺寸：

1. 轴流散热风扇尺寸标准：

   2510 (25mm x 25mm x 10mm)

   3010 (30mm x 30mm x 10mm)

   3510 (35mm x 35mm x 10mm)

   4010 (40mm x 40mm x 10mm)

   4015 (40mm x 40mm x 15mm)

   4020 (40mm x 40mm x 20mm)

   4028 (40mm x 40mm x 28mm)

   5010 (50mm x 50mm x 10mm)

   5015 (50mm x 50mm x 15mm)

   5020 (50mm x 50mm x 20mm)

   6010 (60mm x 60mm x 10mm)

   6015 (60mm x 60mm x 15mm)

   6020 (60mm x 60mm x 20mm)

   6025 (60mm x 60mm x 25mm)

   6038 (60mm x 60mm x 38mm)

   7015 (70mm x 70mm x 15mm)

   7020 (70mm x 70mm x 20mm)

   7025 (70mm x 70mm x 25mm)

   8015 (80mm x 80mm x 15mm)

   8020 (80mm x 80mm x 20mm)

   8025 (80mm x 80mm x 25mm)

   8038 (80mm x 80mm x 38mm)

   9225 (92mm x 92mm x 25mm)

   9232 (92mm x 92mm x 32mm)

   9238 (92mm x 92mm x 38mm)

   12025 (120mm x 120mm x 25mm)

   12038 (120mm x 120mm x 38mm)

   14025 (140mm x 140mm x 25mm)

   14038 (140mm x 140mm x 38mm)

   15050 (150mm x 150mm x 50mm)

   17251 (172mm x 150mm x 51mm)

   20053 (200mm x 200mm x 53mm)

   20060 (200mm x 200mm x 60mm)

   25489 (254mm x 254mm x 89mm)

   28080 (280mm x 280mm x 80mm)

   33083 (330mm x 330mm x 83mm)

2. 直流鼓风机尺寸标准：

   4010 (40mm x 40mm x 10mm)

   5010 (50mm x 50mm x 10mm)

   5015 (50mm x 50mm x 15mm)

   5020 (50mm x 50mm x 20mm)

   6015 (60mm x 60mm x 15mm)

   6020 (60mm x 60mm x 20mm)

   6025 (60mm x 60mm x 25mm)

   7530 (75mm x 75mm x 30mm)

   9733 (97mm x 97mm x 33mm)

   12032 (120mm x 120mm x 32mm)

3. 离心风机尺寸标准：

   100 (100mm x 25mm)

   12038 (120mm x 120mm x 38mm)

   14025 (140mm x 140mm x 25mm)

   14038 (140mm x 140mm x 38mm)

   15050 (150mm x 150mm x 50mm)

   17251 (172mm x 150mm x 51mm)

   20053 (200mm x 200mm x 53mm)

   20060 (200mm x 200mm x 60mm)

   25489 (254mm x 254mm x 89mm)

   28080 (280mm x 280mm x 80mm)

   33083 (330mm x 330mm x 83mm)

这些尺寸是散热风扇的常见规格，可以根据自己设备的具体需求选择合适的风扇尺寸。