HVAC - EPA Certification Practice Exam 2026 - Free EPA Certification Practice Questions and Study Guide

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What classification indicates no flame propagation in refrigerants according to ASHRAE?

A1

The classification that indicates no flame propagation in refrigerants according to ASHRAE is classified as A1. This classification signifies that the refrigerant is non-flammable, meaning it does not support combustion and will not propagate a flame. ASHRAE uses this classification system to categorize refrigerants based on their flammability and toxicity, helping to ensure safety in HVAC applications.

A refrigerant classified as A1 is deemed safe for use in systems where a higher risk of fire exists and is desirable in many applications due to its stability. It allows HVAC professionals to select refrigerants with confidence in their safety regarding fire hazards. In contrast, other classifications, such as A2, B1, and B3, indicate varying degrees of flammability or toxicity, which may require additional precautions during handling, storage, and operation. Understanding these classifications is crucial for ensuring the safe and effective use of refrigerants in HVAC systems.

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A2

B1

B3

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