How should a termination vent located 20 feet outside a building be installed?

How should a termination vent located 20 feet outside a building be installed?

• A. Nose up with a screen
• B. Flat with a cap
• C. Angled down without a screen
• D. Nose down with a screen

Answer: (D)

Key idea: Outdoor vent terminations are designed to shed precipitation and block pests while allowing exhaust to escape freely. Placing the vent nose-down directs rain, snow, and condensate away from the opening, helping prevent water from entering the duct. Adding a screen on the termination cap blocks birds, insects, leaves, and other debris from getting inside, which helps avoid blockages and backdrafts. So, a downward-angled termination with a screen combines weather shedding with pest protection, making it the best choice for an exterior vent located away from the building. The other orientations either invite water intrusion (upward angle or flat) or leave the opening exposed to pests and debris (no screen).

Key idea: Outdoor vent terminations are designed to shed precipitation and block pests while allowing exhaust to escape freely. Placing the vent nose-down directs rain, snow, and condensate away from the opening, helping prevent water from entering the duct. Adding a screen on the termination cap blocks birds, insects, leaves, and other debris from getting inside, which helps avoid blockages and backdrafts.

So, a downward-angled termination with a screen combines weather shedding with pest protection, making it the best choice for an exterior vent located away from the building. The other orientations either invite water intrusion (upward angle or flat) or leave the opening exposed to pests and debris (no screen).