Grant COMBI 70 MkII - Page 14

Combi 70 & Combi 90 Oil Boilers
14
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)