Module 52 May 2013
1. Which decade saw the adoption of polyester as a material for textile-based ducting?
A 1940s B 1950s C 1960s D 1970s E
1980s 2. Which of these statements is most likely to be true?
A Compared to LDC, HDC fabric ductwork provides good dust-holding capacity and extends the period required between washes
B LDC textile-based ducting is ideal where the supply air is poorly filtered when supplying a cleanroom
C Textile-based ductwork is only suitable for straight sections of ducted air distribution
D Systems employing fabric-based air distribution may only be used for heating applications
E
Fabric-based air distribution cannot be applied where there is a predominant heating load
3. In an office application, what is the cooling load per metre- squared floor area that may be achievable with a ceiling mounted permeable fabric-based air distribution system with a room-supply
∆T of 3K? A 25 W.m-
²
B 50 W.m- C 100 W.m- D 150 W.m- E 200 W.m-
² ² ² ²
4. How are the sections of fabric ductwork typically connected? A Lightweight aluminium flanges and non-ferrous bolts B ‘Velcro’-style fasteners C ‘Zip’-style fasteners D Sewn together as complete system in factory
E Connected using lacing with brass eyelets and polyester cord
5. According to the article, what throws are achievable when using 60 mm nozzles?
A 10 m B 15 m C 20 m D 25 m E 30 m
50 CIBSE Journal May 2013
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