CPD PROGRAMME Module 37 February 2012
1. What is the maximum specific fan power (SFP) allowable to satisfy the England and Wales Building Regulations for a central mechanical ventilation system with both heating and cooling?
A 1.4 W/(litre·s-1 B 1.6 W/(litre·s-1 C 1.8 W/(litre·s-1 D 2.0 W/(litre·s-1 E 2.2 W/(litre·s-1
) ) )
) )
2. Which of these is unlikely to be included in the calculation of fan power, according to BS EN ISO 5801:2008?
A Fan bearing efficiency B Fan impeller efficiency C Fan motor speed D Motor efficiency E Transmission efficiency
3. Which international test category is most likely to reflect a centrifugal fan in an AHU?
A Category A B Category B C Category C D Category D E No category is suitable
4. According to this article, when the data for the NEL tests was compared with AMCA’s data (in the early 1990s), which fan type had reasonable agreement?
A BC centrifugal B FC centrifugal C Roof fans D Tube axial E Vane axial
5. Following a centrifugal fan with its outlet transformed into a 400mm diameter duct, what straight length of duct does AMCA suggest before any obstruction or change in direction to avoid a significant system effect in a general building services application?
A 200mm B 400mm C 600mm D 800mm E 1,000mm
60 CIBSE Journal February 2012
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