Pulmonary capacity tests are required before operators can be cleared for using respiratory equipment. These tests should be performed at a minimum of once every...?

Pulmonary capacity tests are required before operators can be cleared for using respiratory equipment. These tests should be performed at a minimum of once every...?

• A. 1 year
• B. 2 years
• C. 3 years
• D. 4 years

Answer: (C)