Can these dust extractors be used as a shop vac?

Yes, they can be used for shop vac tasks. We would recommend a larger diameter hose if you will be collecting debris to prevent clogging. Festool offers a variety of cleaning sets to aid with shop vac tasks.https://www.festoolproducts.com/accessories/dust-extractors/cleaning-sets.htmlTubes and nozzles can also be purchased individually.https://www.festoolproducts.com/accessories/dust-extractors/tubes-nozzles.html