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e1851a

Siemens Building Technologies

Cerberus Division

01.2002

4.2.1 Clean room type A, 1

example

A cleanroom with axial air circulation fans installed sideways connecting the supply-air ple-

num (dropped ceiling) at the top and the return-air plenum (raised floor) at the bottom.

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Dropped ceiling Height: 5m

Air treatment floor 3

floor

Height 5.5m

Cleanroom 2

floor Height: 3.4m

Raised floor Height: 2m

Utilities distribution area 1

floor

Height: 3.4m

Air handling system

Air circulation fans: 12 units

Output per unit: 92,000m

Total output: 1,104,000m

Siting: 6 air circulation fans on each side of the 50m wide room

Aspiration filter

50m

60m

Fig. 4 Cross-section through the clean room type A

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AD2

HSD

6 air sampling

holes each tube,

spacing 0.6m

Aspiration filter

3.6m x 2.0m

Aspiration filter

3.6m x 2.0m

Raised floor

(air return area,

height 2m)

Air circulation fan

0.6m

1.25m

Alternative HSD placement for better

smoke location and higher sensitivity

View A – A

(BDH2450.1)

HSD* HSD*

Fig. 5 High sensitivity air sampling smoke detection system in raised floor type A