I appreciate all the replies so far! I thought I’d summarize where I’m at so far in my research and what I’ve learned so far, in case it can be helpful for others.
Fans can make or break your training, especially when you’re “going deep” on an intense workout. In my case, this has become an obsession leading into my Knighthood attempt coming up in mid-August. I want to stay as cool as I can through my 10 SUF workouts!
It seems the Lasko high power fan I was considering (mentioned in my original post) is quite highly regarded by many indoor cyclists, but it doesn’t seem to actually push that much CFM (cubic feet per minute). It’s in the mid-300 CFM but from what I’ve read, it puts out a much more focused wind “beam”.
Other popular options seem to be the high-power 20” floor fans that push very high CFM, but with a less focused wind pattern.
Air conditioning units seem like a good idea if you’re not already in an air conditioned space.
The other consideration is decibels…65-70 dB is what you’d expect to have as ambient noise in a car at ~100 km/h, so when I see a fan putting out 5100 CFM at 65 dB, I’m happy. I can live with that. Related to this is that I often wear my noise cancelling headphones now to remove the noise from the fans. It’s been a game changer and I love them.
Finally, some fans come with a remote control, but most don’t so many people plug their fan into a wifi power strip. Personally, I’ve just used a more old school method for some time now (and will probably continue to do so because it works well) by plugging my fans into a power bar plugged into another plug that can be controlled wirelessly with a remote. We bought it a long time ago for Xmas tree lights but it’s now used only for indoor cycling.
So in the end, I’m going to get a floor unit like the 20” Honeywell floor unit mentioned by @spoons52 (but not exactly as I’m not in the UK). It puts out 5100 CFM at 65 dB and it’s about 2/3 of the price of the Lasko option I had been considering and 1/2 the price of the comparable Lasko 20” floor model.
So in the end, this is the unit I’m buying … it’s from a Canadian retailer, but I’m sure these exist just about anywhere under different brands if you look. https://www.canadiantire.ca/en/pdp/mastercraft-floor-fan-20-in-0437331p.html