Buderus Logano plus GB312 Installation Manual page 21

– 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.
– If there is a connection to the outside through a venti-
lated attic with vertical ventilation ducts, each vent
aperture must have a minimum cross-section of one
square inch per 4000 Btu/h of the total burner output
of all gas-fired appliances inside the closed room. The
attic must be ventilated at both ends of the house.
– If there is a connection to the outside through horizon-
tal ventilation ducts, each vent aperture must have a
minimum cross-section of one square inch per 2000
Btu/h of the total burner output of all gas-fired appli-
ances inside the closed room. The duct cross sectional
area must not be smaller than the free area of the inlet.
– If there is a connection to the outside through a venti-
lated attic and ventilated crawl space, each opening
must have a minimum cross-section of one square inch
per 4000 Btu/h of the total burner output of all gas-
fired appliances inside the closed room. The attic must
be ventilated at both ends of the house.
Logano plus GB312 - Technical specifications are subject to change without prior notice
Openings for combustion air supply and venting
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