11 Dec Horizontal vs Vertical Laminar Flow Hoods: A Simple Guide

If you’re struggling to understand the differences between horizontal vs vertical laminar flow hoods, you’re not alone. Understanding laminar airflow and fluid dynamics can bring back painful memories of high school physics classes, and in truth, it’s not necessary to understand so much information in order to make the right decision on which one you need. In this article, we’ll walk you through some of the main differences between horizontal and vertical laminar flow hoods, and help you decide which one may be the best fit for your work.

If you want to talk to an expert immediately about what you need, consider reaching out to us here.

What is a Horizontal Laminar Flow Hood?

Horizontal laminar flow hoods work by directing air from the back of the unit to the front (moving parallel over the work surface). There will be a HEPA/ULPA filter at the back of the unit so that only clean air flows over the workspace.

What is a Vertical Laminar Flow Hood?

Vertical laminar flow hoods, on the other hand, pull air from the top of the unit and direct it downward onto the workspace. The HEPA or ULPA filter will be placed on top of the hood (this can sometimes save space in crowded rooms). The air exits through vents at the bottom, so the airflow is top-to-bottom.

What are the Differences Between Horizontal and Vertical Laminar Flow Hoods?

The main difference between horizontal and vertical laminar flow hoods is, of course, how the air moves in the workspace. Each type has its strengths, depending on what you’re working on inside.

Airflow Direction

As we’ve discussed, the direction of airflow is the most fundamental difference between these hoods. Horizontal hoods send air from back to front, while vertical hoods move air from top to bottom.

Horizontal flow hoods work well for tasks like assembling electronics or working with small parts because the air flows smoothly and evenly across the workspace without pushing down on tools.

Vertical flow hoods, on the other hand, are better for dealing with chemicals, drugs, or other hazardous substances because the air directs particles down and away from the user, rather than toward them.

Applications

As you might expect, horizontal hoods are ideal for non-hazardous work, as the airflow points directly toward the user. They also reduce turbulence across the working space, which is especially helpful when working with small electrical parts, medical devices, or tiny powders that could be disturbed by airflow.

Vertical hoods, as we’ve mentioned already, are better for applications involving materials that could harm the user. The downward airflow helps direct contaminants away from the user and workspace, which is important when handling certain chemicals, preparing compounded medications, or working with dangerous biological samples.

Horizontal vs Vertical Laminar Flow Hoods: The Bottom Line

When deciding between horizontal and vertical laminar flow hoods, it all comes down to the type of work you’ll be doing and how much you’ll need to protect the operator.

• Choose a horizontal hood for non-hazardous activities that require lower levels of turbulence in the workspace. Delicate work, like working with microelectronics, is perfect for horizontal flood hoods. The smooth airflow across the workspace keeps everything clean and stable.
• Choose a vertical hood for activities that may involve dangerous substances, like handling chemicals or compounding medications. The downward airflow directs contaminants away from the user and helps to maintain a clean and safe environment.

Still have questions about airflow and clean environments? Reach out to the team of experts at Allied Cleanrooms to learn how we can help you design a cleanroom that fits all your needs—including the right laminar flow hoods.