In freezing conditions, what is the recommended recipe for soap solution during a pre-installation air/soap test?

The recommended recipe for soap solution during a pre-installation air/soap test in freezing conditions is a combination of 8 ounces of dish detergent and 4 gallons of water. This specific mixture ensures that the solution has the right viscosity and surface tension to effectively bubble when air leaks are present. The larger volume of water acts as a carrier for the detergent, creating a less viscous and more spreadable solution that can easily be applied to any potential leak areas.

Using a higher concentration of detergent, as indicated in this recipe, helps to produce a more pronounced bubbling effect, making it easier to detect even small leaks. The ratio provided strikes a balance that is effective in colder conditions, ensuring that the soap does not freeze quickly, thereby allowing for a more reliable test. In contrast, other options either provide insufficient detergent to create proper visibility of leaks or use an improper ratio that could affect the testing process.