Exhaust air ducting reduces the possibility of motor contamination by dirt or moisture. Electrical system is double-protected. 25-foot electrical cord. Electrical cord wrap. Recessed wheels and clamps. Filter efficiency 99.5% to 1.0-micron (optional HEPA filter 99.7% to 0.3-micron). Drain outlet. High impact poly construction canister with lifetime canister warranty. Industrial-grade polyolefin wheels with stainless-steel shafts.