Ventilator Fan



Verify ID:


Expiration date:

April 05, 2019 - April 04, 2023

Verification Mark

Product Information

Plenovo brings to market the only patent pending solution to prevent manhole explosions and sense fires without false positives.  The PreVent® Ventilator 2.0 is part of Plenovo’s data-driven, complete solution for actively protecting the safety of your city and health of your underground vault infrastructure.

Most secondary network manhole explosions share a root cause:  Aged or damaged underground cables are susceptible to small fires, which then pyrolyze insulation and spew flammable byproducts (such as carbon monoxide and methane) into adjacent utility vaults.  Active ventilation of these vaults therefore reduces the hazardous accumulation of flammable gases, minimizing explosion risk.  The PreVent Ventilator provides continuous, active ventilation with a verified exhaust rate of 530 cfm against maximum flow restriction, effectively controlling the vault environment.

* This information was provided by Plenovo and may contain additional information outside the scope of this Claim Verification.

Applicable To:

PreVent Ventilator 2.0 - Manhole Ventilation Unit

Applicable SKUs:

Marketing Claim Verified by UL Solutions

Active ventilation and exhaust rate of 530 cfm max

Verification Method

The device under test was installed in a fully sealed vault such that air exchange occurred only through the manhole cover. During test setup, steps were taken to smooth out any pipe edges as much as possible to mitigate the influence of edge effects. Just above the inlet, three holes large enough to accommodate an anemometer were drilled, approximately 120 degrees apart. With the ventilator powered at 100% duty cycle, the anemometer was inserted through one of the drilled holes and traversed straight across the pipe, up to half of its diameter, to obtain a velocity profile. Data was logged for one minute at one-inch intervals and this process was repeated through all three holes. Volumetric flow rate was calculated by averaging velocities measured at each interval, and integrating the averages over circular rings. The assumption is made here that the velocity is axisymmetric and constant through each 1-inch interval.

About the Company

Plenovo is focused on helping solve critical issues for vault owners and their communities. The real danger and damage of manhole explosions inspired the team to develop the PreVent Solution, the only manhole event prevention system. PreVent 2.0 is a complete solution with 14 patent pending technologies. We have serviced and participated in the utilities industry for over 30 years. The leadership team regularly presents and participates at industry events such as Institute of Electrical & Electronics Engineers (IEEE), Power & Energy Society (PES) and Insulated Conductors Committee (ICC). Plenovo is based in Kent, WA.

What is UL Verification?

UL Verification is an objective, science-based assessment that confirms the accuracy of marketing claims. Our independent assessment process scrutinizes the validity of specific advertising or promotional statements, giving you a way to separate verified fact from fiction.