Pyroplex Rigid Box Single Centre Flipper Fire, Smoke & Acoustic Seal is a combined intumescent fire-door seal with one centrally positioned flexible flipper, designed to provide fire, cold-smoke and acoustic sealing around suitable timber doorsets.
The seal combines an intumescent core, a rigid box section and an integral flexible flipper positioned along the centre of the profile.
During normal use, the centre flipper contacts the opposing door or frame surface to help restrict smoke, sound, draughts and visible light through the perimeter gap.
When exposed to elevated temperatures during a fire, the intumescent material expands to help close the gap between the door leaf and frame, supporting the performance of the complete tested fire-resisting doorset.
Each seal is supplied in a fixed 2100mm length and is available in:
Available colours are:
A single centre flipper seal incorporates one flexible polymer flipper positioned centrally along the rigid intumescent profile.
When the door closes, the flipper deflects against the opposing surface and helps close the normal operating gap between the door leaf and frame.
The product performs three complementary functions:
The flipper is thermally fused to the rigid box section to help prevent it from separating during normal use.
During everyday conditions, the intumescent section remains inactive within the routed rebate in the door leaf or frame.
When exposed to the heat generated by a fire, the active material expands and helps fill the gap between the door leaf and frame.
This action supports the complete fire-resisting doorset by helping restrict:
The seal is one component within the complete doorset and does not independently provide a fire-resistance period.
The flexible flipper projects from the centre of the rigid casing.
When the door closes, the flipper bends against the opposing door or frame surface and helps bridge the operating gap.
The central position provides a balanced sealing contact along the middle of the profile.
Correct operation depends on:
The flipper should make consistent contact without preventing the door from closing or latching correctly.
The available profile sizes have primary evidence for different fire-resisting doorset systems:
These designations apply to complete tested or assessed doorset constructions.
An individual strip does not independently provide 30 or 60 minutes of fire resistance. Installing a particular profile will not convert an ordinary door into a certified fire door.
The intumescent seal must reproduce the configuration covered by the door manufacturer’s test evidence, assessment or certification.
The required profile can depend on:
Do not select a seal solely from the nominal FD30 or FD60 classification.
The flexible centre flipper helps restrict cold smoke through the gap between the closed door and frame.
The Pyroplex Flipper range has been tested to:
For effective smoke control, the flipper should make consistent contact with the opposing surface around the required perimeter of the door.
Smoke may still pass through other parts of the doorset, including:
A suitable automatic drop seal or approved threshold-sealing system may therefore be required beneath the door.
The centre flipper helps reduce airborne sound leakage by restricting the open air path around the door perimeter.
The Pyroplex Flipper range has been acoustically tested to BS EN ISO 10140-2.
The individual strip does not have a universal standalone decibel rating.
Final acoustic performance depends on the complete door assembly, including:
The Single Centre Flipper should therefore be treated as one component within a complete acoustic door-sealing system.
Hinges, locks and latches can interrupt the intumescent profile around a door.
Pyroplex states that the intumescent section can be interrupted for essential ironmongery while maintaining an integral flipper, where this arrangement is supported by the applicable doorset evidence.
This can help preserve smoke and acoustic continuity through local hardware positions.
The approved detail may require:
Do not cut away or reposition the profile without checking the doorset specification.
The flexible flipper is thermally fused to the rigid box section.
This construction helps reduce the risk of the flipper tearing away or delaminating during normal use.
The improved durability and tamper resistance can be useful in high-use environments such as:
The single centre flipper provides a streamlined alternative to traditional open brush-pile seals.
Its central polymer flipper creates a clean, controlled contact line around the door perimeter.
The smooth flipper is also easier to wipe clean than an open brush profile, provided suitable mild cleaning products are used.
The intumescent material is enclosed within a rigid outer casing.
The rigid box section helps:
The profile includes a self-adhesive backing for installation into a correctly prepared routed groove.
Once the rebate has been machined and cleaned, the release liner is removed and the seal is pushed firmly into position.
The adhesive should only be applied to a surface that is:
Pyroplex specifies an application temperature between +5°C and +40°C.
The Pyroplex Single Centre Flipper Seal is designed for installation into routed rebates in:
It can be used within suitable:
The precise seal location, quantity and arrangement must follow the evidence for the complete doorset.
The Single Centre Flipper has one flexible flipper positioned centrally along the rigid profile.
The Offset Flipper, also known as the Side Flipper, positions the flipper towards one side of the casing.
The offset version may be specified where the side-positioned flipper is required to maintain continuity through particular hinge or ironmongery details.
The profiles are not automatically interchangeable. Use the exact configuration specified within the relevant doorset evidence.
The Single Centre Flipper uses one flexible contact element positioned in the centre of the rigid casing.
The Double Flipper, referred to by Pyroplex as the Twin Flipper, contains two flexible flippers.
The number and position of flippers form part of the tested seal arrangement. Do not replace one configuration with another solely because the profile dimensions are the same.
This product is available in:
The first measurement is the nominal width of the rigid box profile. The second measurement is its nominal depth.
The central flipper projects beyond the rigid casing to contact the opposing surface.
This product is available in four stocked colours:
Pyroplex manufactures the wider profile range in six standard colours, but this product range contains the four options listed above.
Colour selection affects the visible appearance and does not alter the required fire-door specification.
Each seal is supplied as one 2100mm length.
The profile can be cut to suit the approved position within the door leaf or frame.
More than one length may be required to complete a doorset. The quantity depends on:
Suitable applications can include fire-resisting timber doorsets in:
Before ordering, confirm:
Do not substitute an offset, double or triple-flipper profile without confirming that the alternative is covered by the doorset evidence.
Pyroplex Rigid Box Single Centre Flipper Fire, Smoke & Acoustic Seal is a self-adhesive, rigid-cased intumescent strip with one centrally positioned flexible polymer flipper for suitable fire-resisting timber doorsets.
| Product Name | Pyroplex Rigid Box Single Centre Flipper Fire, Smoke & Acoustic Seal |
| Manufacturer | Pyroplex |
| Manufacturer Profile Name | Rigid Box with Single Flipper |
| Supplier Description | Single Centre Flipper |
| Product Range | Rigid Box Flipper Range |
| Product Type | Rigid-cased intumescent fire, smoke and acoustic door seal with a centrally positioned flexible flipper |
| Application | Edges and frames of suitable fire-resisting timber doorsets |
| Primary Functions | Fire, cold-smoke and acoustic perimeter sealing |
| Intumescent Element | Pyroplex intumescent material contained within a rigid box section |
| Flipper Material | Flexible, tear-resistant polymer flipper |
| Flipper Position | Central within the rigid profile |
| Flipper Construction | Thermally fused to the box section to reduce delamination during normal use |
| Ironmongery Arrangement | The intumescent section may be interrupted for ironmongery while retaining an integral flipper where permitted by the doorset evidence |
| Fixing | Self-adhesive backing and push fit within a correctly routed groove |
| Standard Length | 2100mm |
| Available Sizes | 10 × 4mm, 15 × 4mm and 20 × 4mm |
| Available Colours | Black, Brown, Grey and White |
| Manufacturer’s Wider Colour Range | Six standard colours |
| Installation Position | Routed rebate in the timber door-leaf edge or frame, in the position required by the doorset evidence |
| Suitable Door Actions | Single and double action |
| Suitable Door Configurations | Single- and double-leaf doorsets |
| Latch Configurations | Latched and unlatched doors, subject to supporting evidence |
| Acoustic Doorsets | Suitable where supported by the tested door and sealing specification |
| Application Type | New-build and suitable retrofit applications |
| Fire-Resistance Systems Covered by Available Sizes | 30- and 60-minute systems within appropriate tested or assessed doorsets |
| Fire Test Standards | BS 476: Part 20/22 and BS EN 1634-1 |
| Smoke Test Standards | BS 476: Part 31.1 and BS EN 1634-3 |
| Acoustic Test Standard | BS EN ISO 10140-2 |
| Certifire Approval | Certificate CF822 |
| Certifire Technical Schedules | TS35 and TS21 |
| Recommended Application Temperature | +5°C to +40°C |
| Traceability | Product identification is provided on each profile |
| Standalone Fire Rating? | No — fire performance depends on the complete tested or assessed doorset |
| Standalone Acoustic Rating? | No — acoustic performance applies to the complete tested door and sealing arrangement |
| Size | Length | Manufacturer Part Number | 30-Minute Evidence | 60-Minute Evidence | Smoke Evidence | Acoustic Evidence |
|---|---|---|---|---|---|---|
| 10 × 4mm | 2100mm | 30160 | Yes | No primary evidence listed | Yes | Yes |
| 15 × 4mm | 2100mm | 30165 | Yes | No primary evidence listed | Yes | Yes |
| 20 × 4mm | 2100mm | 30166 | No primary evidence listed | Yes | Yes | Yes |
| Size | Colour | Product Code |
|---|---|---|
| 10 × 4mm | Black | 104SF/2100/BLK |
| 10 × 4mm | Brown | 104SF/2100/BRN |
| 10 × 4mm | Grey | 104SF/2100/GRY |
| 10 × 4mm | White | 104SF/2100/WHT |
| 15 × 4mm | Black | 154SF/2100/BLK |
| 15 × 4mm | Brown | 154SF/2100/BRN |
| 15 × 4mm | Grey | 154SF/2100/GRY |
| 15 × 4mm | White | 154SF/2100/WHT |
| 20 × 4mm | Black | 204SF/2100/BLK |
| 20 × 4mm | Brown | 204SF/2100/BRN |
| 20 × 4mm | Grey | 204SF/2100/GRY |
| 20 × 4mm | White | 204SF/2100/WHT |
The appropriate profile must be selected using the test evidence, assessment or certification for the complete doorset.
Selection factors include:
The 30- and 60-minute applications refer to complete tested doorset assemblies.
They do not represent independent fire ratings for an individual strip.
In particular:
The flexible centre flipper helps restrict cold-smoke leakage through the door-to-frame gap.
Effective smoke sealing requires:
The profile should not be treated as the only smoke-control component within the doorset.
The Pyroplex Flipper range has been acoustically tested to BS EN ISO 10140-2.
No universal standalone decibel rating should be assigned to one strip.
Final sound reduction depends on the complete tested door assembly and the continuity of the perimeter and threshold sealing system.
Do not coat the flexible flipper with unsuitable paint, stain or high-solvent products.
High-solvent coatings can soften or embrittle the flipper and may cause it to separate from the rigid profile.
Keep the flipper:
Store the seals:
Inspect the installed seals regularly as part of the fire-door inspection programme.
Replace the specified component where the seal is:
Do not replace a damaged Single Centre Flipper with another flipper arrangement or size without confirming compatibility with the doorset evidence.
Pyroplex Rigid Box Single Centre Flipper Fire, Smoke & Acoustic Seal is installed into a correctly sized routed groove in either the edge of a timber door leaf or the timber door frame.
The profile size, quantity, position and treatment around ironmongery must match the test evidence, assessment or certification for the complete fire-resisting doorset.
Confirm the complete doorset specification before machining the door or frame.
Check:
Do not assume that every FD30 or FD60 door uses the same profile, position or number of seal lines.
Inspect the door leaf, frame and ironmongery before installation.
Confirm that:
Correct or report significant defects before installing the seal.
Mark the position specified by the door test evidence, assessment or certification.
Do not assume that every seal must be centred within the thickness of the door edge or frame. The term centre flipper describes the location of the flexible flipper within the profile, not necessarily the location of the complete seal within the doorset.
Check that:
Where two seal lines are specified, mark both positions accurately and maintain the required spacing.
Measure every seal section individually.
For a typical single-leaf door, this can include:
Double doors may also require seals at the meeting stiles.
Do not assume that both jambs or leaves are identical in length.
Transfer the measurements onto the appropriate 2100mm profiles.
Clearly identify which section is intended for:
Keep the adhesive release liner attached while measuring and cutting.
Cut each rigid profile cleanly using a fine-tooth saw or another suitable cutting tool.
Support the strip during cutting to avoid:
After cutting:
Use a router cutter matching the nominal width of the selected rigid-box profile:
Set the groove depth to accommodate the nominal 4mm rigid box section and to match the doorset specification.
The projecting centre flipper must not be included when setting the groove depth.
Test the router setting on a suitable timber offcut where practical.
Route a straight and continuous groove in the specified position.
Use a router guide or fence to maintain consistent alignment.
Machine the rebate carefully to avoid:
The rebate should hold the rigid profile securely without crushing or distorting it.
The treatment around hinges, locks, latches and other hardware must follow the doorset evidence.
Pyroplex states that the intumescent section may be interrupted for essential ironmongery while retaining the integral flipper.
This does not permit unrestricted cutting.
The approved detail may require:
Do not remove the flipper or cut away large sections merely to clear ironmongery.
Remove all routing dust, timber fibres and loose debris.
Use a brush, vacuum and clean dry cloth as required.
The rebate should be:
Dust and contamination can reduce the effectiveness of the self-adhesive backing.
Pyroplex specifies an application temperature between:
+5°C and +40°C
Do not install the profile onto a wet, frozen or excessively hot substrate.
Allow cold seals, doors and frames to reach a suitable installation temperature before removing the release liner.
Place each cut section into its routed groove before exposing the adhesive.
Check that:
Remove the dry-fitted profile carefully.
Peel the protective liner from the self-adhesive backing.
Avoid touching or contaminating the exposed adhesive.
Remove the liner progressively while installing the profile rather than exposing several complete lengths at once.
Align the rigid box section with the routed groove and push it firmly into position.
Work progressively along the complete length while maintaining alignment.
Press the base of the profile firmly into the rebate to create consistent adhesive contact.
Do not:
Repeat the process for every head, jamb and meeting-stile section required by the doorset specification.
At joints:
Close the door and inspect the flipper contact around the required perimeter.
Check the:
The flipper should make appropriate contact with the opposing surface without preventing the door from closing.
Check for:
Open and close the door several times.
Confirm that:
A warped or incorrectly hung door should be repaired rather than relying on the flipper to compensate for excessive gap variation.
The Single Centre Flipper normally treats the head, jambs and any specified meeting stiles.
Where smoke or acoustic containment is required, inspect the gap beneath the door and install the approved:
The selected threshold system must be compatible with the complete doorset evidence.
Inspect the seals regularly as part of the fire-door inspection and maintenance programme.
Check for:
Replace damaged components using the exact specified product, size and flipper configuration.
Do not substitute an offset, double or triple-flipper profile without confirming that it is permitted by the doorset evidence.
Clean the rigid profile and flexible flipper using a soft cloth and a suitable mild cleaning product.
Avoid:
Aggressive products can soften or embrittle the flipper material and reduce its smoke and acoustic sealing performance.
Before installation, store the seals:
The Pyroplex Rigid Box Single Centre Flipper Fire, Smoke & Acoustic Seal is one component within a complete fire-resisting doorset.
It does not independently create a 30-minute fire door, a 60-minute fire door, a smoke-control door or an acoustically rated door.
Final performance depends on:
Always install the seal in accordance with the current doorset evidence, Pyroplex technical guidance and project fire-door specification.
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