HVAC Journeyman Practice Exam

What is the minimum slope required for condensate drain piping per foot?

1. 1/8 inch

2. 1/4 inch

3. 1/2 inch

4. 1 inch

The correct answer is: 1/8 inch

The minimum slope required for condensate drain piping is essential to ensure that the condensate flows properly and doesn't cause any blockages or backflows. A slope of 1/8 inch per foot is considered adequate to allow gravity to effectively move the water away from the system without creating a risk of clogging. This slight incline helps maintain a steady flow, reducing the chance of stagnant water where debris or contaminants could accumulate. While steeper slopes, like 1/4 inch or greater, are sometimes preferred in specific installations to promote even faster drainage, the minimum industry standard is 1/8 inch per foot. This standard is widely recognized in various plumbing and HVAC codes, ensuring that practitioners have a clear understanding of the requirements for proper drainage. The choices representing greater slopes are not necessary for basic drainage functions and could create issues such as increased pressure on the joints and connections of the piping system.