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Whitepaper: Clean Air VOC Filtration Study Summary

Fire fighters are at risk of exposure to hazardous environments and airborne chemicals while responding to calls
in the field. Combustion byproducts at fire scenes present chemical hazards including benzene and other volatile
organic compounds (VOCs). Rosenbauer Motors has implemented an in-cab air filtration system to reduce levels
of airborne contaminants. The system improves the overall health and safety of firefighters by providing a cleaner
space in the fire truck cabin to minimize exposure and inhalation of air contaminants.

Air filtration VOC performance testing for Rosenbauer Motors was carried out by the University of Minnesota-
Particle Calibration Laboratory. Field testing was performed in a standard 60-11 Rosenbauer Commander fire
truck cabin following laboratory filter testing based on the ASHRAE 145.2 standard where toluene was used as a
representative VOC gas.

Controlled levels of VOC contaminants were generated within the fire truck cabin to quantify the performance of
the filtration system. The average initial peak concentration of toluene vapor generated at the beginning of each
test was approximately 67 parts per million (PPM). The filtration system was then activated, and VOC levels were
monitored using a Honeywell ppbRAE 3000+ sensor calibrated with NIST traceability.

Whitepaper: Clean Air VOC Filtration Study Summary

A 50% reduction in VOC concentrations occurred in approximately 2 minutes. Furthermore, an 80% reduction in
VOC concentration occurred in approximately 5 minutes.

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Figure 1 shows the average filtration system performance in reducing air contamination. The VOC concentrations
in PPM with 95% confidence intervals are plotted over time. Figure 2 shows the filtration system mounted inside
the Rosenbauer Commander cabin.
Figure 1. VOC Filtration System Performance Over Time Figure 2. Rosenbauer Cabin Filtration System

A 50% reduction in VOC concentrations occurred in approximately 2 minutes. Furthermore, an 80% reduction in
VOC concentration occurred in approximately 5 minutes. Therefore, the Rosenbauer fire truck cabin filtration
system, having a 50/50 blend of activated coconut shell carbon and potassium permanganate, demonstrated a high
level of effectiveness in removing airborne VOC contaminants using toluene as the representative gas.