Why is it recommended to cut all four sides of a hole in the floor before completing the job?

Cutting all four sides of a hole in the floor before finishing the job is primarily recommended to ensure that heat and smoke conditions do not hinder the work being performed. This approach helps create a larger opening that facilitates better air flow, allowing for the efficient expulsion of smoke and heat from the structure. When a fire burns, it generates significant heat and smoke, which can rapidly reduce visibility and create hazardous conditions for firefighters.

By fully cutting the hole, air can enter more freely, promoting better ventilation and helping to mitigate hot, toxic gases in the area. Additionally, improved ventilation allows firefighters to operate more effectively, improving safety and efficiency during firefighting efforts or rescue operations. The other options primarily focus on creating larger openings or concerns about debris, but the central reason for cutting all four sides directly ties into managing the fire's behavior and maintaining the safety of the firefighting team.