Mitsubishi Electric Lossnay LGH-15RX3 Technical Manual page 123

CHAPTER 10 G Ventilation Standards in Each Country
1.2.5 Standards when the ventilation equipment goes through the fire prevention
section
Ministry of Construction Noice No. 1579 (28 December, 1974)
Building Standards Legal Enforcement Ordinance No. 12, Section 16
In a notice from the Ministry of Construction regarding laws related to the ventilation in medium and high rise apartment
buildings, generally if the air path of the ventilation, etc., goes through the fire prevention section of a fireproof structure, a
fireproofing damper device must be installed. However, in the cases of the following classifications, it is not necessary to install
a fireproofing damper.
(1) When a kitchen, sun terrace, etc., ventilation device's duct goes through a secure hole in the section
Conditions
G
The duct is steel plated and the plate thickness is at least 0.8 mm.
G
There is a 2 m rising section in the central duct, or there is a smoke backflow prevention damper installed.
G
The part of the duct actually going through is less than 250 cm
G
The main structure is securely fixed when installed.
G
The gap around the piercing section of the duct is sealed with mortar, etc.
G
The top of the central duct is open to the outside air, or ventilation fan is installed.
G
The central duct and piping ducts are not used for purposes other than ventilation.
With a 2 m rising duct
Securely installed
Ventilation
fan
Cross-section less than 250 cm
Steel plate thickness is at least 0.8 mm
Sealed with mortar
(2) When the outer wall of the fireproof structure is pierced
Conditions
G
The duct is steel plated and the plate thickness is at
least 0.8 mm.
G
The main structure is securely fixed when installed.
G
The gap around the piercing section of the duct is
sealed with mortar, etc.
G
The part of the duct actually going through is less than
2
250 cm .
G
The opening to the outside air has a shutter attached to
the 0.8 mm or more thickness steel plating that can be
shut at any time.
120
Central
duct
2
2
.
With a smoke backflow prevention damper installed
Smoke backflow
prevention damper
Ventilation
Cross-section less than 250 cm
Steel plate thickness is at least 0.8 mm
Inspection opening
(at least 450 × 450)
Outer wall of fireproof structure
90 cm
or less
Opening section inside 90 cm
applies to main notice
fan
Central
duct
2
90 cm
No regulations
for dimensions
of opening