Pitch on Line Penetrations

Most techs and installers know that drains need to be pitched. I use the rule of thumb that drain lines should generally be pitched 1/4″ per foot of horizontal run. One thing that can easily be forgotten is pitching wall penetrations when drilling.

It's as simple as drilling with a slight upward angle if drilling from the outside or angled slightly downward from the inside. The goal is to have the outdoor side lower than indoors both to assist in draining system condensate and prevent exterior moisture from running into the building.

You will also want to make sure the drain doesn't run above copper or go up and down for any other reason. That is especially common in ductless systems with flexible drains. Keep that pitch moving in the right direction from start to finish, and all will be well.

—Bryan

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Related Tech Tips

Strip Control Wires Properly
Erich Vinson is a tech from Colorado and one of the most entertaining people I interact with online. He wrote this quick tech tip on stripping back the outer jacket properly on control wires, and it happens to also be something I preach. Thanks, Erich. In the first picture (above), you can see what happens […]
Read more
4-20ma Control Basics
Back in the “good old days,” controls were all analog and mechanical; that simply means they acted in a directly connected and variable manner based on a change in force. Both pneumatic (air pressure) and hydraulic (fluid pressure) systems are examples of mechanical or analog controls. When the pressure increases or decreases on a particular […]
Read more
Other Great Sources
You may not know this, but the HVAC School podcast began before the website. When I started the podcast, I never intended to create a website, but there was more demand for quick tech tips than the podcast could hold. So, we started hvacrschool.com. In the same way, I never set out to create a […]
Read more
loading

To continue you need to agree to our terms.

The HVAC School site, podcast and daily tech tips
Made possible by Generous support from