Ventilator Fan
Product Information
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:
ZZ-PRT-020-0028
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
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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.
