Technical information

Combi 70 & Combi 90 Oil Boilers

3 - GENERAL BOILER INFORMATION

Fig. 8 - Air supply for room sealed balanced flue boilers

Fig. 9 - Combustion and ventilation air supply for conventional flue boilers

Minimum size of air vents required - see Figs. 8 and 9

Vent A

Vent B

Vent C

Vent D

Vent E

Combi 70

113 cm² (18 in²)

226 cm² (36 in²)

85 cm² (13 in²)

226 cm² (35 in²)

338 cm² (52 in²)

Combi 90

145 cm² (23 in²)

290 cm² (46 in²)

118 cm² (18 in²)

290 cm² (45 in²)

436 cm² (68 in²)