Listed hood designs are individually tested for capture and containment over temperature controlled cooking equipment by a third party testing and certification lab. The results of capture and containment test are documented and included as part of the hoods listing. The manufacture can then engineer the minimum exhaust air flows of that hood design per the details of that hoods listing.
Non-listed CKV hood designs must meet the requirements of the prevailing codes. The prevailing codes generally provide formulas that are dependent on the type of cooking equipment and the temperature that the cooking equipment is intended to operate at, as well as the amount of open sides of the hood. Some code formula also take into consideration the distance that the CKV hood will be form the cooking equipment.
