Testing av ventilasjonssystem på to overbygde standplasser på Rena leir

The purpose of this study was to test the improvement of air quality around the shooter when using a ventilation system at a roofed range at Rena, Norway. An earlier study tested a prototype for the very same ventilation system for two shooters (FFI - report 2011/00937). In this study the complete installation was tested using twelve shooters. The shooters were divided on two different shooting ranges (Range 3, and 4). Carbon monoxide was measured with detectors mounted on the shoulders of five shooters on each range. Metals from dust in air were sampled on filters mounted on shoulders on two shooters at each range, and by a high volume air sampler placed between two of the shooters. The shooters fired 90 rounds each with the ventilation system off, running at full speed and running at reduced speed. The shooting was performed with HK416 and lead containing ammunition (SS109). The results show a considerable reduction of CO and metals when the ventilation system is running at full speed. However, at reduced speed no reductions in CO were observed at two of the shooters at range 4, and no reduction was observed in CO and metals at range 3.