Buderus Logano GA124 Installation And Maintenance Instructions Manual page 35

Openings for combustion air supply and venting
Total air supply from outside the building
Make sure that the boiler room has two permanent
openings, one of which must not be more than 12 inches
from the ceiling and the other must not be more than
12 inches from the floor of the boiler room, calculated
from the outer edge of the opening. The openings have
a direct connection or a connection through ventilation
ducts to the outside or to rooms that have an
unobstructed connection to the outside (crawl space or
attic). The shortest dimension of all inlet and outlet
openings must not be less than three inches.
1. If there is a direct connection to the outside, each
opening must have a minimum cross-section of one
square inch per 4000 Btu/h of the total combustion
output of all gas-fired appliances inside the closed
room.
2. If there is a connection to the outside through
vertical ventilation ducts, each opening must have a
minimum cross-section of one square inch per
4000 Btu/h of the total combustion output of all gas-
fired appliances inside the closed room.
3. If there is a connection to the outside through
horizontal ventilation ducts, each opening must have
a minimum cross-section of one square inch per
2000 Btu/h of the total combustion output of all gas-
fired appliances inside the closed room.
4. If the openings are connected to ventilation ducts,
the ducts must have the same cross-section area as
the openings.
We reserve the right to make any changes due to technical modifications.
Installation and maintenance instructions Logano GA124 special gas-fired boiler • Issue 04/2005
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