MCZ Boxsystem 75 FR - Manual (Page 10)

Chapter 2
INSTALLATION AND USE MANUAL
page
10
Theoretical concepts 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)
3 mt or more 400 (20x20 cm or ∅ 20 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!
If you have any doubts about your chimney flue
performance or if its dimensions are different from
those recommended, we highly advise you have an
authorised MCZ technician inspect and measure
chimney flue performance (micromanometer
measurements).
MCZ s.p.a. is not liable for poor product operation if
attributable to the use of a poorly dimensioned
chimney flue or installation of the same which fails
to meet the listed requirements.