What is the maximum allowable length for a supply air respirator hose?

The maximum allowable length for a supply air respirator hose is indeed 300 feet. This length is established to ensure an adequate supply of breathable air while minimizing the potential for pressure drops and ensuring that the air quality remains consistent. Longer hoses can lead to challenges in maintaining air pressure and may increase the risk of contamination, as the hose may be exposed to different environmental factors.

In occupational settings where respirators are utilized, such as during asbestos-related work, maintaining a reliable and safe air supply is crucial. The 300-foot limit balances the need for mobility and accessibility with safety regulations designed to protect workers from respiratory hazards.