NRRl means Noise Reduction Rating for the Lower-rated protector in
Commercial
Similar to NRRl
ABS - Anchor Bolt Stabilizer
ABS - Acrylonitrile Butadiene Styrene
ABS - Anti Blockier System
ABS - Agile Body Suit
ABSD - Achievable Buoy Station Dimension
ABV - Air Blast Valve
AC - Antique Copper
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