the 1 kilowatt Y-channel amp has a push/pull assembly. 4 fans total (see below). Note this amp is the same as
the "BLAX1000" with more images.
service_manual - service manual can be found here.
blay1000_fans - 4 fans total,
2 in front (pull) and 2 in back (push).
24Vdc/0.21A; 80x25mm; 3 wire lock rotor; 45.9 CFM; 3110KL-05W-B79 originally. Replacement: 3110KL-05W-B69-D00 from Newark or Digikey ($10/each)
Power Supply Fan -
the external power supply module needs 2 fans below:
24Vdc/0.07A; 80x25mm; 3 wire lock rotor (pulse sensor); 36.4 CFM; Sanyo Denki 109R0824H4011 originally. Replacement: 9A0824H4D01 from digikey ($9/each)
BLAY1000
BLAY1000