Red Seal Carpenter Practice Exam 2025 - Free Carpenter Practice Questions and Study Guide

The rough opening for an exterior door should account for the dimensions of the door itself, plus extra space for shimming and installation. Typically, a rough opening is about 50 mm (2 inches) wider and 25 mm (1 inch) taller than the actual door size.

Given that the standard width for a residential exterior door is commonly 860 mm (34 inches) and a standard height is usually around 2100 mm (83 inches), the rough opening would need to be slightly larger to accommodate the frame and any adjustments needed.

In this case, the dimensions of 860 mm x 2182 mm provide necessary leeway for installation, as the height allows for additional space beyond the standard door height (which is often 2100 mm). This ensures that the door can be installed properly without any hindrance, facilitating smooth operation and a good fit within the frame.

The other choices likely do not conform to the typical requirements for rough openings, either being too narrow or too tall, which would not support the installation of a standard door properly. Thus, the dimensions given in the correct choice create a suitable rough opening that adheres to installation standards for exterior doors.