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When I first tested the Thermalright TY-147A late last year, I was forced to jig up an adapter to accommodate a round frame 140 mm fan on to a radiator that takes square frame 140 mm fans. It is a deal breaker for many customers who wanted to try out Thermalright fans for their cases, heatsinks and radiators alike that only allowed the use of square frame fans, and also introduced the potential variable of the adapter acting as a small shroud thus giving a potential benefit to the fan in my tests. Thankfully, Thermalright has decided they will indeed hear the suggestions of their customers (current and potential, alike) and have decided to make square frame versions of these fans after all. Enter then the TY-147A SQ and thanks to Thermalright for the test sample.

Let’s take a look at the specs from the product page:

  • Fan Dimension : L140 mm x H140 mm x W25 mm
  • Fan Weight : 190 g
  • Fan Speed : 300 – 1300 RPM (PWM)
  • Sound Level : 16 – 22 dBA
  • Airflow : 14.42 – 62.5 CFM

Also, because it is an apt comparison to be made, let us re-visit the specs of the round frame TY-147A:

  • Fan Dimension : L152 mm x H140 mm x W26.5 mm
  • Fan Weight : 160 g
  • Fan Speed : 300 – 1300 rpm (PWM)
  • Sound Level : 15 – 21 dB(A)
  • Airflow : 16.9 – 73.6 CFM

There are some changes here for sure, for example the frame type which is fairly obvious but overall we see that the TY-147A occupies a larger footprint as well. The increased frame composition on the SQ helps explain the higher mass of the square frame design, but curiously Thermalright rates the SQ at higher sound (marginally) lower airflow numbers relative to the round frame version. They both use the same PWM controlled motor, and rotor with their so-called Enhanced Hyper-Flow Bearing (EHFB) which could just be a long life sleeve bearing for all I know as no other details are provided. The TY-147A SQ carries a 2 year warranty which does not inspire confidence in longevity but for what it is worth I have not heard of the round frame version going bad easily either.

Community member Doyll comes through yet again with another detailed technical drawing of the TY-147A SQ (and also the TY-143 SQ, to be covered later and separately) as well as demonstrating the physical differences between the round and square frame versions:

As you can see, it’s a bit more than simply swapping out frames and there are several subtle changes as well. Let’s take a better look at the fan now on the next page.

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