Figure 1.
Sound pressure levels. The levels are registered at flow rates of 20, 30, and 40 l/min without filter STARMED helmet
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.