Technical data

5.0 Site Requirements

5.5 Flue

1. The following guidelines indicate the general

requirements for installation of flues:-

For GB recommendations are given in BS 5440 Part 1.

For IE recommendations are given in the current edition

of I.S. 813 “Domestic Gas Installations”.

2. Only one of the three available MULTIIFIT vertical

concentric Flexi Flue kits approved for use with the boiler

can be used (10m kit 710143901 or 12.5m kit

710144001). Any proprietary flue systems, terminals,

adaptors etc., MUST NOT BE USED.

3. The available flue kits are intended ONLY for installation

within an existing chimney. This should be clean and

sound, and any other previously installed flue components

(liners, dampers etc.) removed.

4. The flue must have a MINIMUM VERTICAL

HEIGHT OF 3m. No part of the flue must deviate

greater than 45° from vertical. NO HORIZONTAL

RUNS ARE PERMITTED !

5. The terminal must be sited so that free passage of air

across it can occur at all times.

6. It must also be a MINIMUM of 150mm from any other

terminals or obstructions (A). When adjacent to windows

or openings on pitched or flat roofs it must be at least

600mm away (B). A minimum dimension of 2000mm

must be maintained when below windows or openings in

pitched roofs (C) (Fig. 10).

Fig. 10