ASPE Certified in Plumbing Design (CPD) Practice Exam 2025 - Free CPD Practice Questions and Study Guide

The correct answer is that a vent terminal can indeed be extended through a wall, but it must turn down and be covered with a wire screen. This specification is important for several reasons related to the health, safety, and functionality of the plumbing system.

When a vent terminal is installed through a wall, it needs to turn downwards to prevent the entry of rainwater or snow, which could potentially block or damage the venting system. The downturned position also reduces the likelihood of odors entering the building. Additionally, enclosing the endpoint with a wire screen helps keep out debris, pests, and small animals that might otherwise obstruct the vent.

This design consideration aligns with plumbing codes and best practices to ensure that vent systems operate effectively while maintaining safety and protecting against environmental factors. The requirement for a wire screen is a precautionary measure that directly addresses maintenance and operational concerns.

Understanding the details of vent installations and their requirements, such as orientation and protective measures, is essential for effective plumbing design and to meet building regulations.