Vacuums remove contaminants from equipment, facilities, vehicles and houses. They come in three main types: shop vacs, electronics vacuums and HEPA (high-efficiency particulate air) vacuums. Shop vacs work in wet & dry environments. Electronics vacuums are designed for business equipment such as printers. They remove dirt, dust and toner. HEPA vacuums are portable vacuums that clean up hazardous materials. They have powerful HEPA filters that remove harmful contaminants.