MCZ Forma PURO 115 - Manual (Page 9)

Chapter 2
INSTALLATION AND USE MANUAL
page
9
Theoretical notions for installation Technical service – MCZ S.p.A. all rights reserved - Reproduction prohibited
2.5.1. Examples of flue pipes
Square or rectangular section flue pipes 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 flue pipe according to its length is
listed in the table below:
Height (m) Useful section (cm²)
Up to 5 m 900 (30x30 cm or ∅ 30 cm)
Over 5 m 625 (25x25 cm or ∅ 25 cm)
N.B. Too small or too large a section reduces draught and insulation.
For special sections, or section or path variations, functional smoke
exhaust inspections must be conducted as per UNI 9615.
The smoke duct should be equipped with a solid material collection
chamber at the mouth of the smoke duct 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. shall not be held liable for poor operation of the
fireplace stove that is due to a flue pipe of improper size or
installation that does not comply with provided
requirements.
AISI 304 stainless steel flue
pipe with dual chamber
insulated with ceramic wool
or equivalent resistant to
400°C.
EXCELLENT
Flue pipe in refractory brick
with insulated double wall and
external coat of cement mix
lightened with honeycomb
material such as clay.
GOOD
Traditional square section
clay flue pipe with insulating
hollow inserts.
GOOD
Avoid flue pipes with internal
rectangular sections whose
larger side is double the smaller
such as 20x40 or 15x30.
AVERAGE