Protection is an Inside Job

Why the Whistle Means it’s Working

Even with the best seals, ultra-fine dust and moisture can still find their way into compartments. This is where STI’s cabinet pressurization provides a critical advantage by forming an active barrier. STI uses an interior fan to create a slightly higher pressure inside the cabinet compared to the outside environment. Dust and moisture are pushed out, rather than allowed in. And if water does attempt to seep through the seal, the positive pressurization helps blow it back out. Better yet, the air drawn into the fan is filtered for further cleanliness.

On STI’s 9- and 11-foot bodies, a single fan provides this helpful pressurization across both curb- and street-side compartments. For larger 14-foot bodies, one fan per side allows for proper pressurization of all compartments. When you hear the whistle as you securely latch the doors tightly, rest assured it’s doing the job from the inside out.

 A Point About 3-Point Latches

Traditional two-point latches often leave vulnerabilities, which is why STI incorporates 3-point locking doors with stainless steel compression latches for maximum security and long-term corrosion resistance.

Three-point latches improve sealing by pulling the door tightly against the weather strip when the handle is closed and securing the doors at the top, middle, and bottom for maximum security and sealing strength. These latches ensure an even, tight seal while preventing doors from being pulled open enough to tamper with the back of the latch.

Another key strategy to minimize dirt and moisture is limiting the number of holes drilled into the body. Every hole is a potential entry point for dust and water, so we’ve invested significant effort into reducing unnecessary cuts. By designing specialized brackets and wiring hardware, STI has dramatically improved sealing while maintaining strength and flexibility.

Raising the Standard

At Service Trucks International, cabinet pressurization, combined with advanced sealing and latching technologies aren’t optional—they’re standard features designed to extend service life, minimize downtime, and protect your investment in both the tools and diagnostic equipment you carry, as well as the service truck body itself.