KEDDY K20 Installation Instructions Manual - Preconditions
PRECONDITIONS
- 4 -
BUILDING NOTICE
When you install a stove and erect a chimney, you
may need to give building notice to the local Planning
and Building Committee. Contact the Planning and
Building Committee in your municipality for up-to-
date information.
SURFACE
Keddy's heavy masonry stoves (K10, K20, K21)
must be erected on a load-bearing surface with a fire
resistant class of at least REI-60. The surface can
comprise a concrete slab or a concrete vault. In the
case of so-called crawl spaces, the foundations can
be made according to the following principal drawing.
DISTANCE TO FLAMMABLE STRUCTURAL
UNITS
The distance from the sides of the stove to flamma-
ble material must be 500 mm ventilated space. The
distance from the stove's hot air vent to flammable
structural units must be at least 400 mm upwards.
Where necessary, the hot air grille has to be moved
down. (Requires adjustment in place)
If the stove is to be installed against a wall of wood or
other flammable material, a fire retardant wall must
be installed. One example of such a wall is Keddy's
fire wall elements consisting of 50 mm air space and
70 mm pumice concrete (see illus. below). Other ex-
amples are 50 mm light concrete or 50 mm so-called
calcium silicate board; however, a 50 mm air space
must be ensured up behind these fire walls.
FLOOR PLATE
A floor plate must be set in place to protect the floor
from flying embers. The floor plate must extend at
least 300 mm in front of the door. The width of the
floor plate must be at least the width of the hearth
plus 100 mm on each side (see illus. page 5).
The floor plate can consist of natural stone, concrete,
clinker tiles or 0.7 mm steel plate.
OUTDOOR AIR SUPPLY
For the combustion of wood, supply air is required.
The K20 can be provided with an external air supply,
which is recommended for properties with mechani-
cal ventilation.
A sheet metal drum is used for drawing an outdoor
air duct. The connection diameter of the supply air
hose to the stove is 100 mm. If the duct is more than
3 m long, the diameter of the sheet metal drum must
be increased to 125 mm. The drum can be connect-
ed from below or from the rear, see the illustration on
page 5. (The stove's maximum need for combustion
air is approx. 20 m3/h)
The supply air must not be taken from crawl spaces.
If there is a crawl space, the sheet metal drum must
be extended to a ventilation grille in the foundation
wall. If the space is heated, the supply air channel
must be insulated against condensation.
FLUE
The K20 may be connected to a flue approved for a
minimum of 350ºC. As the area, length and material
of the flue are of great importance for the draught
formed in the flue, it is important the flue is not under-
dimensioned.
For the installation to function satisfactorily, the nega-
tive pressure (draught) must be at least 12 Pa during
nominal operation. To obtain this, the minimum rec-
ommended chimney length is 3000 mm, measured
from the top of the stove, and the suitable area is
150-200 cm
2
( approx. 150 mm in diameter ).
The K20 is also approved for connection to older
masonry chimneys with enclosing walls that are only
half a brick thick.
Naturally, the K20 can also be connected to chim-
neys made of prefabricated elements, e.g. the Heda
Chimney.
500