Construction Data for MVA Modular Series Silencers

Standard Construction:

Exterior wrap of unit is constructed from 14 gauge minimum (0.075" thick) carbon steel sheet per ASTM A366 all welded construction per MIL-STD-1595A.  Interior modules are constructed from 18 gauge minimum (0.047" thick) carbon steel sheet per ASTM A366 all welded construction per MIL-STD-1595A.  The interior modules are treated with a 1.5 pound per square foot layer of acoustical dampening compound and then covered with a fiberglass acoustical insulation bonded to a high velocity scrim cloth per Oxel^® 919 treatment.  The spiral matrix is constructed from stainless steel per ASTM-A240.

Attenuation materials are fiberglass based acoustical insulation bonded to 26 gauge (0.016" thick) acoustical lead sheet as a septum.  All exposed fiberglass face is bonded with a fiberglass scrim cloth per Oxel^® 919 treatment to a minimum strength per square inch of 80 lbs warp and 70 lbs filler, packed under a minimum of 5% compression.  Fiberglass based insulation is vermin and moisture proof with a flame-spread maximum of 25.

Alternate Construction Materials:

Stainless steel (300 & 400 series) or aluminum (5052, 6061 & 2024).

Internal spiral holders can be PVC coated.

Other blade septums include copper sheet, loaded vinyl sheet, and stainless.