I made my own arch but I bought my 2x8 pans from Smoky Lake. I also purchased a blower from Jim at that time and it was a 500-550 cfm blower. He was putting those blowers on his 2x6 and 2x8 evaporators. I don't know if that helps but that's what I used until I switched to a high pressure blower for my AUF and AOF arch. I had no issues with that blower but thought running one blower for both would be a bit easier than using two for my arch.
Chad
2014: 12 taps, 5 gal buckets
2015: 15 taps on bags
2016: 150 taps: 100 on bags, 50 on 3/16" natural vac, 2x8 AUF/AOF Homebuilt Arch, 2x8 SL Drop Flu & Auto Draw, SL Propane Canner/Bottler
2017: 225 taps: Built Lean to, Added SL hood, preheater, concentric exhaust, SL SS 7" SB Filter Press
2018: 180 taps: Added Shurflo to 50 - 3/16", Auto fill sensor to head tank
2019: No tapping
2020: 175 taps
2021: 300 taps, homemade RO and releaser
2022: 600+ taps