I bought a small, inexpensive store brand compressor from Menard's (a big box home improvement center in the Midwest US.) I installed it in the basement just outside my darkroom, installed filters and a regulator, and connected it to a coiled hose with air gun inside the darkroom. I regulate down to 15 or 20 psi to give a gentle but effective cleaning. It is noisy even inside the darkroom when it kicks on to refill the tank, but that only lasts for 30 seconds or so.