asvjerrry is correct.
TWO 12VDC 100mm [or 120mm or 140mm] fans run on 3.5VDC. One either side of the amp PULLING air AWAY from the amps will keep them and the equipment above sufficiently cool.
FAN: https://www.amazon.com/gp/product/B019SY0TAO
PSU: https://www.amazon.com/gp/product/B01G7KT0V6
IMO, the curved fan blades as shown are mandatory. I've been actively cooling HiFi and other electronics since the 1970's. Curved blades are the quietest in this application.
I have 5 such fans for my 3 tube and 1 ss amps in my Tri-Amped rack system. My media room is sub-40dB. At 1 foot from the amps, the fan noise is neither audible nor measurable. See http://ielogical.com/assets/Audio/FanCtrl.jpg for a "Power Distribution" example.
105 pounds atop a stand not much larger than the amp footprint is a severe earthquake hazard.
TWO 12VDC 100mm [or 120mm or 140mm] fans run on 3.5VDC. One either side of the amp PULLING air AWAY from the amps will keep them and the equipment above sufficiently cool.
FAN: https://www.amazon.com/gp/product/B019SY0TAO
PSU: https://www.amazon.com/gp/product/B01G7KT0V6
IMO, the curved fan blades as shown are mandatory. I've been actively cooling HiFi and other electronics since the 1970's. Curved blades are the quietest in this application.
I have 5 such fans for my 3 tube and 1 ss amps in my Tri-Amped rack system. My media room is sub-40dB. At 1 foot from the amps, the fan noise is neither audible nor measurable. See http://ielogical.com/assets/Audio/FanCtrl.jpg for a "Power Distribution" example.
105 pounds atop a stand not much larger than the amp footprint is a severe earthquake hazard.