Dometic reefer fan died

[Hoghead]

I have Dometic CU100 compressor units and the fan on one had gone feeble evidenced by the plate not cooling normally. Difficult to judge but it appeared to be turning slower than the other unit.
Placing a 12" floor fan in front of the suspect unit solved the problem and confirmed my diagnosis of poor air flow. Upon removal I found the bearing has flat spot.

No problem I say and off to the computer shop for a new 120mm x 25mm fan. I can pass more wind than the high tech spiral blade, 90 CFM unit I bought.
A bit of online shopping on Lazada Philippines has no end of 120mm x 25 computer fans with nice LEDs, but few with specs.

No idea if the fan I removed is OEM, and all it gives in the way of meaningful spec is 0.5A

I found some 120 x 35mm fans with 245 cfm at 4500 rpm and an impressive 65 Db, with 1A draw.
Probably a bit loud..............

How many cfm does one need to cool the reefer in tropical conditions. It was 42C yesterday

What is a reasonable power consumption and Db level?