Final answer:
Openings for attic ventilation typically have a least dimension of not less than 1/16 inch and not more than 1/4 inch, according to common building standards, but local codes should be consulted for exact requirements.
Step-by-step explanation:
The question refers to the requirements for attic ventilation in construction or building codes. Although the specific dimensions can vary based on local building codes or guidelines, a common standard is that the openings for attic ventilation should have a least dimension of not less than 1/16 inch (1.6 mm) and not more than 1/4 inch (6.4 mm). This is to allow for air to circulate while preventing the entry of unwanted elements such as pests. It is important to refer to local codes for the exact requirements applicable to a particular jurisdiction.
In the context of attic ventilation, openings that are inappropriate for purposes of ventilation may be detrimental to the structure. Therefore, it is essential to consider the size of the openings. According to the statement, the dimension of attic ventilation openings should not be less than a certain minimum, let's say X inches, to ensure adequate airflow. On the other hand, it should not exceed a certain maximum, let's say Y inches, to prevent potential structural issues or other problems.