FIRESTOPSYSTEMS INTERNATIONAL

1. FSS International Fire protection
FireStopSystems International Ltd.
Spelleweg 3
NL-7475 GV Markelo
Tel: +31 (0)547-363519
Fax: +31 (0)547-361465
E-mail: info@fssinternational.nl
Website: www.fssinternational.nl
Brochure
Intumescent Air transfer grilles

2. FSS International Fire protection
Index
1. LVV40
2. LVH44
3. LVH50
4. LVH54
5. LVV40-S / LVH44-S
6. LVH44-G

3. Fire protection
Fire resistant walls and floors in a building play an important part in
containing the spread of fire and smoke. However, a building also
needs to be well ventilated for the health and comfort of its
occupants. Systems of natural and mechanical ventilation often
require ducting to pass through fire resistant walls and floors, and
this can compromise the fire containment in the building.
The FSS Lorient solution is to fit intumescent air transfer grilles at
the point where the fire resistant wall or floor is breached. Under
normal circumstances these grilles allow air to pass freely through
the building. However, in the event of fire the slats and frame swell
to many times their original thickness, fusing together to form a
non-combustible mass which provides fire resistance to match the
surrounding construction, and prevents the passage of hot smoke
and gases.
When combined with automatic smoke control systems, Lorient's
intumescent air transfer grilles will also provide protection against
cold smoke. These electrically powered dampers/shutters are
connected to a standard smoke or fire alarm/detection system
which, when triggered, causes the dampers/shutters to close
thereby preventing the passage of cold smoke. Under normal
circumstances the dampers/shutters remain open allowing the free
passage of air.

4. Fire protection
Type: LVV40
General
This product's compact form allows for installation in apertures where
other types of damper can not be fitted or accessed after installation.
Requiring no commissioning or operation function checks. These
products provide confidence with economy. Available in sizes from
98mm square to 598mm square and many height to width ratios in
25mm increments.
Fire resistance up to 120 minutes. Tested against EN 1634-1
Specifications
Materials:
Intumescent material used in the slat construction is based upon
sodium silicate and provides the lowest activation temperature of any
intumescent material at 100 degrees C. It is encapsulated in PVC
extrusions with cross section dimensions of 40mm x 6mm and they
are assembled in the form of a matrix.
Mortised jointing of the damper slats to the intumescent outer
components eliminates the need for any metal components around
the periphery.
Each size of damper is manufactured 2mm less than the
corresponding aperture size to provide clearance during installation.
e.g. a 198mm x 198 mm damper is suitable for a 200mm x 200mm
aperture.
The complete assembly is a robust and easily installed product that is
easy to clean using a vacuum cleaner or brush.
Care is taken during manufacture to seal the material from the effects
of moisture, since sodium silicate is by nature hydroscopic. However,
in application where high levels of humidity or wetness are
anticipated, it is recommended that LVH44 products should be used.
Orientation:
LVV 40 products should be used in a vertical orientation as
illustrated.
1

5. Fire protection
Type: LVH44
General
This all-purpose damper can be relied upon to function in extremes of
climate and environment.
It can suffer considerable abuse during and after installation without losing
effectiveness in the control of fire and hot gases.
Contaminants do not readily adhere to it and therefore an efficient airflow
can be expected throughout its working life.
The LVH44 range dampers can be assembled
in multi-modules in order to protect large apertures.
Fire resistance upto 120 minutes. Tested against EN 1634-1
Specifications
Materials:
The composite intumescent material selected for the LVH44 range consists
of graphite particles that are contained in a carrier that is impervious to the
effects of water. The material when activated by heat produces a very
durable barrier to the spread of fire and hot gases, whilst providing good
insulation performance.
Intumescent slats are formed by wrapping intumescent material in metal
foil, creating a 4mm thick section. Steel channels, 5.5mm wide, support the
outer edges of the slat and are themselves located into notches in both the
front and back steel frames. The two piece outer frame is arranged to give
a thermal break between the front and back and is made from 1.00mm.
galvanised mild steel.
Each damper size is manufactured 2mm less than a nominal aperture size
to provide clearance when installed in an aperture of the same nominal
dimensions. e.g. a 198mm x 198mm nominal size damper will suit a
200mm x 200mm aperture.
The complete assembly is a rugged damper that is easy to install and will
require minimal, if any, post installation attention.
Orientation:
LVH44 dampers can be installed in any orientation.
Standard sizes available (mm):
All sizes from 68 x 68 mm upto 1.200 x 2.400 mm! Thickness 44 mm
2

6. Fire protection
Type: LVH54
Part of Lorient’s LVH range of high
performance intumescent dampers, the LVH54
has been specifically developed to meet the
tough requirements of ISO 10294 Part 5.
During the ISO 10294-5 test, the LVH54 was
successfully proven to:
form a complete seal within 2 minutes
withstand a 300Pa pressure differential across
the damper
maintain its fire integrity for a period of four hours
In everyday service the LVH54 offers excellent airflow
characteristics (approx 60% free area), is resistant to
clogging, and has no moving parts – so it provides
consistent performance, and requires virtually no
maintenance.
Specifications
Manufactured using a zintec steel frame and stainless
steel slat covering – ideal for use in harsh duct
environments, including high humidity applications.
Graphite-based intumescent material.
Width & height: 100mm to 600mm (nominal) in
50mm increments. Custom sizes also available.
Depth: 54mm.
3

7. Fire protection
Type: LVV40-S / LVH44-S
General
The LVV40S and the LVH44S damper types are designed to be linked with
smoke sensors via a fire alarm panel and therefore provide excellent cold
and hot smoke containment. The combination of intumescent and
electro-mechanical technologies allows proven fire resistance with very
good insulation properties. Remarkably little current is used by the servo
motor when opening or closing the smoke shutter module and none is
drawn when the shutter plates are either closed or open. The units can
be supplied to suit a wide range of wall thickness and aperture sizes.
Pressed steel cover grilles can be supplied in a range of colours to
enhance the appearance of these reliable products.
Fire resistance upto 120 minutes. Tested against EN 1634-1
Specifications
Materials:
The damper casing is manufactured from high grade mineral board and is
supplied complete with the fire damper and smoke shutter module
assembled into it. The LVV40 damper that provides 60 minutes fire
resistance and the LVH44 damper that gives 120 minutes fire resistance
are described elsewhere in this publication. Information on the smoke
shutter module and damper control system can also to be found
elsewhere in this catalogue.
Orientation:
These products are designed to be installed in a vertical orientation as
shown above. Any departure from this arrangement must be authorised
by the Lorient Technical Department.
4

8. Fire protection
Type: LVH44-G
Fire resistant window ventilation grille (EW 30 minutes)
• This fire resistant window ventilation grille was developed specifically for use
directly on fire resistant glass in facades.
• Under normal conditions, air passes freely through the grille (at a volume of up
to 13 litres per second at 1 Pa pressure differential). However, when subjected
to heat the intumescent core will expand and prevent the passage of fire and
hot gases during a fire.
• The outside of the grille has horizontal ‘louvred’ slats to prevent water ingress
• On the inside there is a rotary control to allow the air flow to be increased or
reduced as required.
• The perimeter of the grille has a thermal break to minimise heat transfer.
• The grille is fitted in the same way as a normal glazing ventilation grille.
• The intumescent core of the grille (Intumescent damper reference LVH44) is
tested against British and European standards
Because materials in a construction can affect each other in a negative way
during fire conditions, it is necessary to test a complete construction.
The LVH44-G fire resistant window ventilation grille has been successfully tested
as a complete glazed assembly by Warrington Fire Gent, against the European
standard EN 1364-1.
The tested structure was built up as a meranti timber frame of approx.
1000x2000 mm, glazed with Pyropelite 12 from AGC Flatglass (total thickness 36
mm) The LVH44-G system was placed directly on top of the glazing.
The fire-resistance of the tested construction is classified as 30 minutes E and
EW according EN 1364-1.
The fire test evidence (report WFRG-14097A) applies only to a structure as
tested.
5