Suspension on the head is from an adjustable band. Some manufacturers provide a chin strap to help stabilize the helmet so that it moves with the head. Wide angle vision is provided through a clear face shield. Made of tough polycarbonate, the shield is abrasion resistant and impact proof. Air is supplied to the helmet through a flexible hose from a blower unit that is worn on a belt.
Air flow is regulated with several motor speeds on the blower.
Helmet models for greenhouse application operate on battery power. Some manufacturers use rechargeable nickel-cadmium batteries with a 4 to 8 hour operating cycle. These will give about 2 years of service under normal use. Others use a sealed lead-acid battery. A charger that connects to a 115 volt power supply is included with the unit.