For in-line eductors to function properly, the inlet must be no more than what height above the level of foam concentrate?

In-line eductors are designed to blend foam concentrate with water for firefighting purposes. For these devices to operate effectively, it is crucial that the foam concentrate be supplied at the correct height relative to the eductor. When the inlet of the eductor is positioned above a certain height from the foam concentrate, it can create issues with suction and pressure, ultimately preventing the eductor from drawing the concentrate efficiently.

The established maximum height for the inlet above the level of the foam concentrate is specified as 6 feet. This is because if the inlet is positioned higher than this distance, the ability of the eductor to siphon the foam concentrate can be compromised due to gravitational effects and inadequate suction. By maintaining this 6-foot limit, firefighters ensure that the system remains effective and allows for a proper mixing of foam and water, which is essential during fire suppression operations.

Choosing a height greater than 6 feet could lead to inadequate foam application, which can hinder extinguishing efforts or compromise safety. Thus, understanding and adhering to this guideline is vital for effective firefighting practices.