HORIZONTAL FLUE OPTIONS - Lmax - 12 metres 12 m A B L = A + B = 12m max. L = A + B + (90° bend = 1.3 metre) A L = A + (2 x 45° bends = 1.8 metre) Fig. 4.1 VERTICAL FLUE OPTIONS Not less than 300 mm Not less than 300 mm H H Hmax = 14 m Hmax = 12.2 m (14 m - 1.8 m) Fig. 4.2 Alpha E-Tec 28 and 33 - General Boiler Information 11 A B A