I use the AC Infinity S7 and set right, it pulls air from the inside of the amp and also pulls air across the fins. WQorks like a charm. Best $49 I have ever spent.
https://www.acinfinity.com/componen...-component-cooling-fan-system-top-exhaust-12/
https://www.acinfinity.com/componen...-component-cooling-fan-system-top-exhaust-12/