What refrigerant safety group classification has the highest flammability and the highest toxicity?

B3

Explanation:

In the classification of chemical refrigerants of the International Institute of Refrigeration, capital letters correspond to the toxicity level and numbers indicate the flammability level. Since toxicity is divided into categories A and B, and flammability into categories 1 to 3, the highest flammability and toxicity of a refrigerant is indicated by "B3".

Answer;

-B3

Explanation;

Refrigerants are divided into two groups according to toxicity:

-Class A signifies refrigerants for which toxicity has not been identified at concentrations less than or equal to 400 ppm; and

-Class B signifies refrigerants for which there is evidence of toxicity at concentrations below 400 ppm.

They are also divided into three groups according to flammability:

-Class 1 indicates refrigerants that do not show flame propagation when tested in air at 21°C and 101 kPa;

-Class 2 indicates refrigerants having a lower flammability limit of more than 0.10 kg/m3 at 21°C and 101 kPa and a heat of combustion of less than 19 kJ/kg;

-Class 3 indicates refrigerants that are highly flammable as defined by a lower flammability limit of less than or equal to 0.10 kg/m3 at 21°C and 101 kPa or a heat of combustion greater than or equal to 19 kJ/kg.

-Therefore; the answer for the above question would be Class B and class 3.