chapter
Individual Mechanical Ventilation (2)
SfB74 ‘LOOVENT’ TOILET VENTILATION UNIT ‘MECHAVENT’ TYPE PF HORIZONTAL EXTRACT SYSTEM
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The ‘Harmony P and PD’ surface mounted extract fans from Greenwood Airvac each contain a double inlet impeller designed to be self balancing for most application. An air fl ow of 85 m3/W is attained against a static head of 30 N/mm2 when only one intake is used the air fl ow will be reduced to approximately 75 per cent. The installed resistance will be dependent on the ductwork: Data for calculation of static pressure are given in the IHVE Guide for Pipes and Bends in a variety of materials.