Ferroli DIVAtop F 24 Instructions For Use, Installation And Maintenance page 18

Connection to collective flues
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If you are then going to connect the DIVAtop F 24 boiler to a collective flue or a single flue with natural draught, the flue
must be expressly designed by professionally qualified technical personnel in conformity with the current standards and
be suitable for airtight chamber units equipped with a fan.
In particular, flues must have the following characteristics:
• Be sized according to the method of calculation stated in the current standards.
• Be airtight to the products of combustion, resistant to the fumes and heat and waterproof for the condensate.
• Have a circular or quadrangular cross-section, with a vertical progression and with no constrictions.
• Have the ducts conveying the hot fumes adequately distanced or isolated from combustible materials.
• Be connected to just one unit per floor.
• Be connected to just one type of unit (or all and only forced draught units or all and only natural draught units).
• Have no mechanical suction devices in the main ducts.
• Be at a lower pressure, all along their length, under conditions of stationary operation.
• Have at their base a collection chamber for solid materials or condensation equipped with a metal door with an air-
tight closure.
18
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fig. 25 - Examples of connection to flues (
cod. 3540E821 - 11/2008 (Rev. 00)
DIVAtop F 24
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= Air / = Fumes)
EN