Question

HEPA filters are defined as A or more efficient in removing, from the air, B particles generated by vaporization of the hydrocarbon Emory 3004.

• A. A -99.99% B-0.1 μm
• B. A -99.00% B-0.3 μm
• C. A- 99.99% B-0.3 μm
• D. A-99.00 % B-0.1 μm

Answer 1

The Correct Option is C

To accurately answer the given question, let's break down the components required for defining HEPA (High-Efficiency Particulate Air) filters. These filters are specifically designed to be highly effective in removing certain particles from the air.

HEPA filters are characterized by their efficiency and the size of particles they can successfully filter. The typical criteria for a filter to be classified as HEPA is as follows: 

• Efficiency: At least 99.97% in filtering particles.
• Particle Size: Targets particles that are 0.3 micrometers (μm) in diameter, which is known as the most penetrating particle size (MPPS). The reason 0.3 μm particles are specified is because they are considered to be the hardest size to filter.

Given the typical HEPA filter specifications described above, the correct answer to the question is:

A - 99.99%

B - 0.3 μm

Reasoning:

• The efficiency mentioned in the question, 99.99%, is consistent with high-performance HEPA filters, which achieves a very high level of particle removal.
• The size 0.3 μm is spot on with the standardized smallest particulate size that HEPA filters are designed to effectively remove.

Therefore, option "A - 99.99% B - 0.3 μm" correctly aligns with the known standards for HEPA filters, hence it is the correct choice.