Ikea Lack Print Box Air Circulation (using 70mm & 80mm fan)

I'm using Ikea Lack as print box (with 100mm raiser). As expected, the hot air accumulate on top, where bottom is relatively cooler. After 10hrs printing the top is ~5'c hotter than bottom.

I made this air circulation pipes/stand which fit standard 70mm fan, to circulate the top/bottom air within the print box, to get a more even temperature.

The pipes come with 50mm / 100mm / 150mm height, one end with mounting plate to mount 70mm fan. You can print "two" and tape them together, so both e