Air capture hood
Commissioning Air Systems (BG 49/2015), written by Chris Parsloe and published by BSRIA in March 2015, explains how to commission ducted air distribution systems in buildings. It was originally published in 2013 and was then updated in 2015.
It states in relation to an air capture hood (thermal): “This instrument measures air flow by means of exposed thermal elements housed inside a moulded rectangular section body over which the air passes. The instrument has a measurement range of 2 to 65 l/s with a typical accuracy of ±5% of the indicated value.’
It defines an air capture hood (Balometer) as: ‘….lightweight collapsible assemblies used for the measurement of flow rates at supply and extract diffusers. An air flow hood captures the air from the diffuser and directs it past an integral array of pressure sensing points which (working on pitot tube principles) provide a direct measurement of flow rate. They give a direct reading, usually in l/s. The typical range is between 25 and 950 l/s. Typical instrument accuracies are in the range ± 3% of the indicated value.’
See also: Balometer.
--BSRIA
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