When foam induction fails, a likely cause is a mismatch between which two components?

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Foam induction relies on matching the eductor’s flow rating to the nozzle’s discharge flow. The eductor creates suction to draw foam concentrate into the water stream, and each eductor is rated for a specific flow at a given nozzle size. If the nozzle flow doesn’t align with the eductor’s rating, the suction isn’t right, so concentrate isn’t drawn properly and induction fails. That direct interaction between the eductor and nozzle flow is what governs successful foam induction.

The other factors listed don’t drive the induction process in the same way. Material or hose size doesn’t affect the suction mechanism, foam concentrate color or foam type doesn’t change the physics of aspiration, and while viscosity can influence performance, the core issue when induction fails is the mismatch between eductor and nozzle flow ratings.