The design of our unique disposable double bib hood offers even greater protection for workers by allowing extra space for a hard hat. Lightweight, rugged and reinforced down tube with swivel connection gives added flexibility. The split air channel design delivers air inside the hood around the temple area. The double bib style means increased protection by simply tucking the inner layer into the protective clothing. NIOSH approval number TC-19C-409. This hood comes with an Adjustable Flow Control Valve. The high pressure Adjustable Flow Control Valve adjust air form any high pressure air source for greater comfort. It meets NIOSH minimum flow requirements.