INSTALLATION AND USE MANUAL
Chapter 2
page
10
Theoretic notions for installation
Technical service - MCZ
S.p.A. all rights reserved - Reproduction prohibited
2.5.1.
Examples of chimney flues
AISI 304 stainless steel chimney
flue with dual chamber insulated
with ceramic wool or equivalent
resistant to 400°C.
EXCELLENT
Refractory chimney flue with
dual insulated chamber and
external concrete sleeve and
lightweight
clay
type
honeycomb material.
GOOD
Traditional square section clay
chimney flue with insulating
hollow inserts.
AVERAGE
Avoid
chimney
flues
with
internal rectangular sections
whose larger side is double the
smaller such as 20x40 or
15x30.
POOR
Square or rectangular section chimney flues must have rounded internal
corners with radius not less than 20mm. For the rectangular section,
the ratio between internal dimensions must be ≤1.5.
The recommended section for a chimney flue according to its length is
listed in the table below:
Height (m)
Section (cm²)
Up to 5 mt
(20x30 cm or
∅
22 cm)
From 5 to 7 mt
(20x20 cm or
∅
20 cm)
Over 7 mt
(18x18 cm or
∅
18 cm)
N.B.
Too small or too large a section reduces draught and insulation.
For special sections or section or travel variations, functional smoke
exhaust inspections must be conducted as per UNI 9615.
The smoke conduit should be equipped with a solid material collection
chamber at the mouth of the smoke conduit to be easily opened with an
airtight door.
IMPORTANT!
In the event of doubt on your chimney flue
operations or that its dimensions are different from
those
recommended,
we
highly
suggest
an
authorised MCZ technician inspect and measure
chimney
flue
performance
(micro-gauge
measurements)
MCZ s.p.a. is not liable for poor stove operations if
attributable to the use of a poorly dimensioned or
non conform installation of the chimney flue.
