Longer LK4 turbine fan duct

I took an existing dual duct cold end blower and remixed it so all the fans are the much quieter turbo fans. The temperature on my cold end was actually a little better with this configuration as the fan blows directly on the heat exchanger. The original dual-duct design was fine but bulky. One of my prints failed and only one duct printed. I tested it and it performed just as well as the dual duct so I re-engineered this one with a single blower. I purchased 3 @ 5015 (50mm x 15 mm) blower fans from Amazon. https://www.amazon.com/gp/product/B079BMX2S6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 Since I didn't use all 3, I replaced the original noisy cooling fan on the power supply with one. I took out the center of the metal to make sure I was moving enough air. 2 years on and I have not had any cooling problems and my LK 4 is very quiet.