MHS Boilers Ultramax 115, Operating & Maintenance Manual, Page: 20 / 46

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Table 4 Air supply connection
The connection to the air supply pipe is always mounted on the back of the unit.
Multiple units may not be connected to the same air supply or flue pipe.
To prevent snow entering, the air supply pipe must extend at least 300 mm above the roof and
must be fitted with a rain cap.
The flue pipe opening must end at least 1000 mm above the roof, assuming the roof to be flat.
Fig. 6 Heights of air inlet and flue gas discharge
The relative horizontal difference between the flue pipe and the air supply pipe must not be less
than the width of the unit.
Fig. 7 Distance between air inlet and flue gas outlet
To prevent undesirable condensate from forming, we strongly recommend that you insulate the
air-supply duct on the outside to make it vapour tight.