OSHA‘s Permit-Required Confined Spaces Rule for general industry states that a confined space must bepermit-required when the space has a potential to contain a hazardous atmosphere, which is defined forflammables as an atmosphere that exceeds 10 percent of the LFL [29 CFR 1910.146(b)] (Section 6.1). Apermit-required confined space program mandates that employers specify acceptable entry conditions andtake actions such as purging or ventilating the space to eliminate or control atmospheric hazards such as aflammable atmosphere [29 CFR 1910.146(d)(3)(i), (iv)]. However, the rule does not define acceptable