The power consumption used by any system is not a reliable measurement of how much air the unit moves.
You really want to use a CFM measurement, regardless.
I think that something around the 120 CFM range would be plenty, especially if it’s well sealed and has good suction. And don’t forget, the GF comes with an internal fan that’s standard as part of the hose attachment. So you won’t be doing all the work with just one filter/fan.
That DIY laser filter is well done, but seems to have faults. Rather than using charcoal for odor absorption, they’re using multiple filters? Seems like expensive overkill at $10 a filter. And it’s HUGE! Maybe they found the smell too obnoxious (that’s what you get for not using charcoal) and just tried filtering and filtering and filtering…
I’m pretty confident that the one I’m working on will be plenty for most needs.