Low Speed Enveloping Test with Perpendicular and Inclined Cleats
Edition 2018-11-20

Fans - Determination of fan sound power levels under standardized laboratory conditions - Part 3: Enveloping surface methods
Edition 2025-01

BS ISO 13347-3 Fans - Determination of fan sound power levels under standardized laboratory conditions. Part 3: Enveloping surface methods
Edition 2025-01-23

Industrial fans - Determination of fan sound power level under standardized laboratory conditions - Part 3 : enveloping surface methods.

Determination of sound power levels and sound energy levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane
Edition 2019

Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:2010)
Edition 2011-09-28

Requirements for the safe operating envelope of nuclear power plants
Edition 2019

Reciprocating internal combustion engine driven alternating current generating sets Part 10: Measurement of airborne noise by the enveloping surface method
Edition 2014-12-16

Envelopes
Edition 2010-12-20

Propeller Clearance Envelope
Edition 2013-02-05