Those will happily hook up to a dust collection system and can also hook up to a shop vac. Some fans simply haven’t got the power to push against a pressure differential such as a breeze blowing the wrong way. Shop vac is noisy but will definitely do the job. I know you don’t want to leave a shop vac outside (nature abhors a vacuum) but the basic theme here is you need to really move a decent amount of air with a purpose built suction system of some kind. A more powerful fan would be a good place to start.