The Breezeway welding helmet ventilation system brings air into the helmet through a bifurcated air system along two paths. The Face Stream flows along the front of the helmet to keep the lens free of fog, while the Blocking Stream flows to the top and back of the helmet to remove heat and exhaled CO2. The ventilation unit clips into the top of the welding helmet shell, it is lightweight and battery operated so there is no obstruction to the user when installed. Breezeway improves the welding experience with a lightweight, portable unit that fits any welding helmet. Features Improved visibility through the helmet reduces errors Time saved not having to clean the lens or wipe away sweat Comfortable working environment improves morale Healthy breathing environment, free of fumes No cords or air hoses to deal with Lightweight device reduces fatigue (only 5.8oz!) Total length 5.75″ (14.6 cm) Fits most welding helmets Specifications Weight: 1.81 lbs Dimensions: 8.5 × 7.25 × 2.75 in Model: Standard Model Included in the case Portable briefcase- padded to keep your device safe Breezeway Device Charging Cord - 3ft cord lets you charge on the go, providing a full charge in just 4 hours Breezeway Helmet Ventilation System - Standard