Manual KFD STO MAX 7 3F (page 8 of 24) (English)

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„Installation and operation manual“

2.3 Tip of the chimney

The strength and stability of draught in the chimney depend as well on the kind of chimney

tip. It ought to reach above the roof ridge and protect the outlet against rain and adverse

impact of wind (figure 7).

(a)

(b)

(3)

Figure. 4 Example chimney tips: a) prefabricated tip, b) brick version, c) steel tip – so called

chimney cowl.

The chimney tip ought to meet the following requirements:

 its internal diameter should be equal to the diameter of the chimney,

 usable diameter of the combustion gas outlet is to be twice the size of the chimney

diameter,

 it ought to protect the chimney against adverse weather (rain, snow) and foreign bodies,

 it ought to be easily accessible for maintenance and cleaning of the chimney,

 in case of two adjacent chimneys, tip of one chimney ought to be located at least 50 cm

above the other one, in order to avoid mutual interference of produced negative

pressure (figure 8),

 chimney tip ought to be situated 6 m away from any obstructions, such as walls, rocks

or trees according to the local in regulations. Otherwise, the chimney ought to be

extended to protrude approximately 1 m above the existing obstruction. The chimney tip

ought to be situated approximately 1 m above the roof surface (figure 9).

Figure 5. Construction of adjacent chimneys.

Figure 5a. Chimney placement

2 m

6 m

1 m

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KFD STO MAX 7 3F Manual

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