35
Installation
Connections
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regard to their outlet area
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You may opt for:
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under-pressure
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over-pressure
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installation is indoors. For such
situations, we recommend collective
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(`open device` Boiler category B).
If you install a common duct providing
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other appliance.
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negative pressure.
In the case of collective venting
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outlet always has to end up in the
open area (outlet area 1).
0,2 x
2
x B
Boiler category: B
Outlet area 1
(free outlet area)
Boiler category: C
Permitted only when the air
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outlet are in the same
pressure area