Confined-space equipment provides ventilation, lowers and lifts workers and equipment, and protects access points in tunnels, tanks, sewers, silos, and other spaces with limited entry or exit. Confined-space fans and blowers attach to ventilation ducting to circulate air and remove fumes. Confined-space entry systems consist of a tripod frame, lifeline, and other components for raising, lowering, and supporting workers. Confined-space winches mount on tripods, davit arms, or guard rails to provide leverage and power for lowering and lifting. Confined-space hoist frames, masts, bases, and mounts replace worn hoist parts or create a hoist system to meet specific lifting requirements. Confined space venturi blowers help cool workers or prevent machinery from overheating. Manhole guard rails help prevent people from falling into an open manhole.