„Installation and operation manual for fireplace insert”
KFDECOENG1.1562012
26
a
b
a
b
5 Tables
NOTE: ONLY GRAVITATIONAL HOT AIR DISTRIBUTION IS TO BE ADDED IN
CALCULATIONS FOR CONVECTION AIR OUTLETS.
CONSIDER THE SECTION AREA OF PIPES COMING OUT FROM THE CHIMNEY DUCT
–
NOT THE AREA OF HOT DISTRIBUTION AIR OUTLET AREAS
Table 4. Convection air inlet and outlet areas.
Draught
[Pa]
Minimum inlet of
outdoor air
Min. section area of convection air
inlet
Min. section area of total
convection air outlet
Opening
without grate
Opening with
grate
Opening
without grate
Opening with
grate
12-20
200 cm
2
or
10 m
3
/h/1kW
500 cm
2
1000 cm
2
600 cm
2
1200 cm
2
Section areas of convection air inlets and outlets:
Opening without mesh
The effective section area is equal to the area of grate
opening:
F=a*b
Opening with grid
The effective section area is equal to half of the area of
the grate opening:
F=(a*b)/2
The section area of the grate opening is reduced
by the section area of the grate itself, constituting
50% of the opening.
NOTE:
▪
In the hood, it is prohibited to install grates with
adjustable blinds; moreover, if gravitational distribution is
considered in calculations of the effective outlet area of
convection air, grates with blinds in gravitational
distribution are not recommended!
▪
Regularly clean inlet and outlet grates in order to
ensure unrestricted flow of convection air.
