Bariera de incendiu ventilată TENMAT VFB Plus
VFB Plus
VFB Plus Ventilated Fire Barrier
Tenmat’s VFB Plus Ventilated Fire Barriers are “open state” cavity fire barriers
designed to offer fire resistance performance within external wall cavities that
require permanent (open-state) ventilation in non-fire conditions.
Passive Fire Protection
VFB Plus
Product Description
Technical Data Sheet
Tenmat’s VFB Plus Ventilated Fire Barriers are ’open state’ cavity fire
barriers for ventilated cavities of up to 450mm.
Each VFB Plus consists of a specially formulated fire rated stone
mineral wool section with an integral high expansion intumescent seal
fixed to the leading edge.
The VFB Plus then leaves a maximum 44mm air gap to allow for
drainage and maintain ventilation in normal use.
In a fire situation the intumescent seal rapidly expands to seal off the
air gap and prevent vertical fire spread within the external wall.
The product has undergone extensive fire testing following the
principles of BS EN1363-1 and in accordanc
e with ASFP TGD19 (Fire
Resistance Test for ‘Open-State’ Cavity Barriers).
The VFB Plus are mechanically fixed horizontally within ventilated
cavities behind the external wall substrate following the fire
compartment line.
The VFB Plus are used horizontally and can be installed in conjunction
with Tenmat NVFB Non-Ventilated Fire Barriers which provide vertical
fire separation along fire compartment party wall lines.
Product Details
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Sizes
Typical Fire Ratings of minimum 30 to 60 minutes Integrity
and Insulation
Higher Fire Ratings available dependent on application
Maintains a 44mm air gap
Up to 450mm cavities tested
Standard thickness of 75mm
Durability and Age Tested
Fixing brackets included as standard
Thickness (Total Cavity less 44mm Air Gap) x 75mm x 1000mm
VFB Plus
Technical Data Sheet
Fire Test Evidence
Fire Test performance to BS EN 1363-1 and to the principles of ASFP TGD19
Inner Leaf Substrate
Type (facing cavity)
with Appropriate
minu
tes Fire
Resistance
Outer leaf
Substrate
Type (facing
cavity) With
Appropriate
Fire
Resistance
Orientation
Insulation
Type Within
Cavity
(interrupted)
Maximum
Cavity
Width (in
mm)
Maximum
Open State
Air Gap
(In mm)
Product
Dimensions
(thickness
x height x
length in
mm)
Product Fire
Resistance Rating
10mm Cement
Particle Board
(Cempanel)
Autoclaved
Aerated
Concrete
12.5mm Weather
Defence Board on SFS
Fire Test Report
Number
Integrity
Insulation
Horizontal
None
60
44
16 x 75 x
1000
180
180
Warringtonfire
WF434726
Autoclaved
Aerated
Concrete
Horizontal
25mm
Phenolic
80
44
36 x 75 x
1000
120
90
Warringtonfire
WF436593
Autoclaved Aerated
Concrete
Autoclaved
Aerated
Concrete
Horizontal
100mm PIR
300
44
256 x 75 x
1000
60
60
Warringtonfire
WF394958
Autoclaved Aerated
Concrete
Autoclaved
Aerated
Concrete
Horizontal
100mm PIR
450
44
406 x 75 x
1000
30
30
Warringtonfire
WF403555
12.5mm Weather
Defence Board (Siniat
Gtec)
Autoclaved
Aerated
Conc
rete
Horizontal
100mm PIR
450
44
406 x 75 x
1000
30
30
Warringtonfire
WF430837
12.5mm Calcium
Silicate Board (Y Wall)
Autoclaved
Aerated
Concrete
Horizontal
100mm PIR
450
44
406 x 75 x
1000
60
30
Warringtonfire
WF430837
The types of insulation tested do not infer generic approval for these insulation products and approval should be sought from the insulation
manufacturers depending upon the particular type of construction being built. Insulation is tested interrupted to prevent the possibility of fire
bypassing behind the cavity barrier.
The ASFP-TGD19 test standard allows for insulation to be replaced with insulation that is listed as better using the hierachy as below and must
be installed interrupted. Notes on insulation from TGD19:2017-13.3 Insulation. For interrupted insulation the following hierachy is used:
Best- stone wool, glass wool, phenolic, PIR, PUR, EPS - Worst
Technical Information
Colour
Red
Finish
Polythene Wrap
Cuttability
Can be cut to length
Storage
Dry, ambient
Transportation Storage Temperature
-20°C to +70°C
Durability
Type X intended for use in conditions exposed to weather (UV, rain, frost)
Fungal Resistance
Protected by polythene
Smoke/Halogen Content
Low Smoke / Zero Halogen
Minimum Total Working Life (Years)
Based on typical climatic conditions
UK
Australia
France
New Zealand
Germany
Hong Kong
The Netherlands
60 years
45 years
60 years
60 years
60 years
40 years
60 years
Working life, durability, halogen content and smoke emission data
refers to the active intumescent component.
VFB Plus
General Design &
Installation Considerations
Technical Data Sheet
Maximum free air gap for this cavity barrier is 44mm, the space in front
of the intumescing strip on the face of the cavity barrier to the rear of the
external wall surface.
Open state cavity barriers should be installed in a continuous run, (with
the exception of abutting up to full fill vertical cavity barriers). Where
this is not possible,
details should be agreed with the projects principal
designer and or fire engineer.
Horizontal cavity barriers should be installed adjacent and tightly
abutted to any vertical cavity barriers, the vertical cavity barriers should
be installed first.
Cavity barriers may be cut to length as required, adjacent lengths must
be tightly abutted together.
The intumescing face of the cavity barrier should be unrestricted and
free to expand in a fire situation, fully filling the cavity.
An identification label is attached to the intumescing face of the cavity
barrier, ensure this faces out into the open cavity. Also ensure the label
is visible and legible and reads the right way up.
If the identification label is not legible please contact Tenmat, the label
is important in terms of identifying the product in the future, for
example during fire risk assessments or fire safety inspections.
Cavity barrier fixing brackets, both multi purpose, (MP bracket) or high
performance (HP bracket) must not pe
netrate through the face of the
cavity barrier.
Screws for direct fixing and fixings to secure brackets are not supplied
by Tenmat.
The brackets used to fix the horizontal cavity barrier must be installed
with the spike inserted centrally (horizontally) to the rock mineral wool
section of the cavity barrier with the bracket fixed above and not below
the cavity barrier.
The use of tape is not required over the joints between the lengths of
cavity barrier, and if used should not be applied over the face of
intumescent material.
The cavity barrier must be installed following the installation methods
described below.
The cavity barrier must not be penetrated by any other mechanical or
electrical services.
VFB Plus
Technical Data Sheet
Fitting Instructions
VFB Plus
Fire Barrier Support Details
Cavity Size (mm)
Product Width (mm)
Fitting Option Number
Barrier Support Type
No. of supports per
metre
Maximum
Centres (mm)
60-120
16-76
1
Screw
4
250
121-134
77-90
2
MP Bracket
2
500
135-259
91-215
3
MP Bracket
2
500
260-299
216-255
4
MP Bracket
3
350
300-450
256-406
5
HP Bracket
2
500
If the barrier is cut to short lengths of <250mm, it should be ensured that each length has at least one fixing holding intumescent seal in place.
This can be located on the front edge of the fire barrier underneath the polythene seal. If no fixing is located, then either another section of fire
barrier should be used or alternatively a further stainless steel , countersunk head screw with max. 11.5mm head diameter and a min. length of
65mm should be fixed at the mid-point.
No additional fixings to the front face are required for product widths greater than 76mm as the intumescent seal is already mechanically screw
fixed during the manufacturing process, unless the product is cut to sections of <250mm. Screws for direct fire barrier fixing refers to stainless
steel, countersunk head screws, max. 11.5mm head diameter, suited to the substrate in question.
If f
ire barrier is directly screw fixed, the screws should penetrate the fire barrier at the mid point and should finish flush or slightly proud of the
front face. Care should be taken not to overtighten as this may affect the performance of the intumescent seal. Fixings for brackets should be
non-combustible and suited to the substrate.
It must also be ensured that any bracket fixing does not prevent the back of the fire barrier from fitting tightly against the substrate ensuring no
gaps. Brackets must impale the fire barrier at mid thickness. Brackets should not penetrate the front face of the barrier and if required should be
cut down in length to prevent this.
Screws for direct fixing and fixings to secure brackets are not supplied by Tenmat. For fire barriers cut down in length <200mm, minimum one
support required. For cut sections >201mm minimum two supports required and/or follow above table. For cavities less than 40mm, contact
Tenmat for alternative products.
VFB Plus
Option 1
Technical Data Sheet
VFB Plus- Product width across cavity 16mm up to 75mm wide,
directly faced fixed
Use stainless steel countersunk head screws, with a maximum head diameter
of 11.5mm and with a length suitable for the cavity barrier and the substrate.
Ensure that the countersunk screw head does not fully penetrate the face of the
cavity barrier, the screw head should sit flush or slightly proud.
125mm
250mm
Position the first screw fixing through the centre line of the face of the cavity
barrier at a maximum 125mm from one end, continue to face fix through at
maximum 250mm centres (4 screws per linear meter), ensuring that the final
fixing is a maximum 125mm from the end of the cavity barrier. This will ensure
that face fixings are positioned at 250mm centres across the continuous run of
cavity barrier.
Where sections of cavity barrier are less than 1 linear meter in length, ensure that
face fixings are positioned at a maximum 125mm from each end with additional
fixing being pos
itioned at maximum 250mm centres between the end fixings.
For cut sections of cavity barrier less than or equal to 250mm in length only one
fixing is required.
VFB Plus
Technical Data Sheet
Option 2
VFB Plus- Product width across cavity from 77mm up to 90mm, fixed using 2
multi purpose (MP) 65mm brackets.
A
MP brackets are supplied with 2 fixing spikes, one spike is 65mm long (A), the
other is 160mm long (B), with a central pre drilled section for securing the
bracket to the substrate.
B
For cavity barriers 77mm-90mm wide (across cavity) use 2 MP brackets and the
65mm long spike (A).
To secure the bracket use 5mm Ø stainless steel countersunk head screws, with
a maximum head diameter of 13mm and with a length and type suitable for the
substrate.
Ensure that the countersunk screw head sits as flush as possible with the
substrate. Fix through both of the fixing holes.
A
250mm
250mm
Fix 2 number MP brackets, per linear meter, to the substrate at maximum 250mm
from the end of
the cavity barrier, with a maximum spacing between brackets of
500mm.
Where sections of cavity barrier are less than 1 linear meter in length, ensure
that MP brackets are positioned at a maximum 250mm from each end. For cut
sections of cavity barrier less than or equal to 500mm in length only one MP
bracket is required.
Push the cavity barrier onto the bracket spike, the brackets should impale the
VFB Plus to approximately mid barrier depth and must not protrude through
the intumescent element.
The cavity barrier should be pushed fully onto the bracket spike and sit flush
with the substrate, at the rear of the cavity barrier.
VFB Plus
Technical Data Sheet
Option 3
VFB Plus - Product width across cavity from 91mm up to 215mm fixed using 2
multi purpose (MP) 160mm brackets.
A
MP brackets are supplied with 2 fixing spikes, one spike is 65mm long (A), the
other is 160mm long (B), with a central section for securing the bracket to the
substrate.
B
For cavity barriers 91mm-215mm wi
the cavity barrier, with a maximum spacing between brackets of
500mm.
Where sections of cavity barrier are less than 1 linear meter in length, ensure
that MP brackets are positioned at a maximum 250mm from each end. For cut
sections of cavity barrier less than or equal to 500mm in length only one MP
bracket is required.
Push the cavity barrier onto the bracket spike, the brackets should impale the
VFB Plus to approximately mid barrier depth and must not protrude through
the intumescent element.
The cavity barrier should be pushed fully onto the bracket spike and sit flush
with the substrate, at the rear of the cavity barrier.
VFB Plus
Technical Data Sheet
Option 3
VFB Plus - Product width across cavity from 91mm up to 215mm fixed using 2
multi purpose (MP) 160mm brackets.
A
MP brackets are supplied with 2 fixing spikes, one spike is 65mm long (A), the
other is 160mm long (B), with a central section for securing the bracket to the
substrate.
B
For cavity barriers 91mm-215mm wi
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