What are the two most common sizes of oxygen cylinders used in the HVAC/R trades?

In the HVAC/R (Heating, Ventilation, Air Conditioning, and Refrigeration) trades, the two most common sizes of oxygen cylinders used are typically those that offer a balance between portability and capacity for various applications. The sizes of 22 ft³ and 55 ft³ are prevalent because they provide enough oxygen for a range of tasks, including cutting, welding, and brazing, while still being manageable in size for technicians to transport and handle in various job environments.

These cylinder sizes are designed to meet the demands of HVAC/R work, allowing for sufficient oxygen supply without being excessively bulky or heavy. The 22 ft³ size is particularly useful for smaller jobs or situations where portability is key, while the 55 ft³ size caters to more extensive tasks requiring a larger volume of gas. This versatility is essential in the field, making these capacities the most utilized among professionals.