Open Daily: 10am - 10pm | Alley door pickup 10am - 7pm 3038 Hennepin Ave Minneapolis, MN
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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
Pass Sound Muffle Tests Using a Structural Firefighter Protective Ensemble Method

Pass Sound Muffle Tests Using a Structural Firefighter Protective Ensemble Method

Lawson, J. Randall
U. S. Department of Commerce

Paperback

Technology & Engineering

ISBN10: 1495454673
ISBN13: 9781495454677
Publisher: Createspace
Published: Jul 31 2009
Pages: 28
Weight: 0.20
Height: 0.06 Width: 8.50 Depth: 11.00
Language: English
The objective of this study was to better understand the relative change in sound level from an activated PASS when it is being used by a firefighter. The alarm signal sound level can be affected by a range of factors including location of PASS device on the firefighter (front, side, or rear), position of the firefighter (prone, supine, fetal), the volume of the room, the wall linings or materials, the presence of furniture or other objects, and background sounds. NFPA PASS Standard 1982 (2007) includes a muffle test where sound attenuation is measured in a sound chamber. While this allows each PASS device to be evaluated under carefully controlled conditions, the testing protocol includes only the location of the pass and the position of the firefighter. This study examined the attenuation of the alarm signal in a more typical room environment than a sound chamber. This study also documented typical background sound levels for fire apparatus, fire fighting equipment, offices, living room, and vehicles. Comparing the background sound levels with the sound attenuation data provides a better understanding as to whether the decreased sound levels will be distinguishable above background sounds.

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