Acoustics. Determination of sound power radiated into a duct by fans and other air-moving devices. In-duct method subscription-only • Annex B (informative) Guidance

• Annex B (informative) Guidance on the description of coarseness/fineness of fine aggregates

Determination of emissions into indoor air

This ensures that users follow the right practice method while citing the sources in unpublished documents

It deals with the testing of fibres

an organization can minimize and manage an interruption to service that threatens the continuity of the business

Acoustics. Determination of sound power radiated into a duct by fans and other air-moving devices. In-duct method subscription-only • Annex B (informative) Guidance1 Scope 1. 1 General This International Standard specifies a method for testing ducted fans and other air moving devices to determine the sound power radiated into an anechoically terminated duct on the inlet and or outlet side of the equipment. NOTE 1 For the sake of brevity, wherever the term fan occurs in the text, it means fan or other air moving device. The method is applicable to fans which emit steady, broad band, narrow band and discrete