RIA Ultrasonic & Ozone Content Cleaning 3

Question 1

What is the OSHA permissible exposure limit (PEL) for ozone as an 8-hour time-weighted average?

Accepted Answer

0.1 ppm

Answer

OSHA sets the PEL for ozone at 0.1 ppm (8-hr TWA) because even low concentrations can cause respiratory damage.

Question 2

At approximately what ozone concentration can most people first detect its characteristic odor?

Accepted Answer

0.01–0.05 ppm

Answer

Most people detect ozone's sharp, electrical smell at 0.01–0.05 ppm, which is at or below the OSHA PEL.

Question 3

How does ozone chemically eliminate malodors in restoration applications?

Accepted Answer

It oxidizes odor-causing compounds, breaking their chemical bonds

Answer

Ozone's extra oxygen atom oxidizes odor-causing molecules, breaking their bonds and converting them into odorless or less offensive byproducts.

Question 4

Which material is most resistant to ozone degradation and therefore safe for constructing ozone treatment chambers?

Accepted Answer

Stainless steel

Answer

Stainless steel resists ozone oxidation, making it the preferred material for ozone-contact vessels and chamber construction.

Question 5

What respiratory protection is required when working in an area where ozone exceeds safe concentration limits?

Accepted Answer

Supplied-air respirator or SCBA

Answer

Ozone is a gas that passes through particulate filters, so only supplied-air respirators or SCBA provide adequate protection at elevated concentrations.

(RIA) Restoration Industry Association Certified Practice Test

(RIA) Restoration Industry Association Certified Practice Test

RIA Ultrasonic & Ozone Content Cleaning 3