Pyrogrille 100 Air Transfer Grille – 25mm Thick is an intumescent air-transfer grille designed for installation within approved apertures in fire-resisting doors, walls and ventilation ducts.
During normal conditions, the open grille construction allows air to circulate between adjoining rooms or through a ventilation system.
When exposed to elevated temperatures during a fire, the graphite-based intumescent material expands to many times its original volume. This expansion closes the openings through the grille and forms a solid fire-resisting barrier within the aperture.
The 25mm-deep profile is available in eleven stocked square and rectangular sizes, ranging from 100 × 100mm to 300 × 300mm.
An intumescent air-transfer grille allows ventilation through an otherwise fire-resisting construction.
The grille remains open during normal building use, providing a free path for air movement.
During a fire:
This allows ventilation to be incorporated into a suitable fire-resisting element without leaving the opening permanently unprotected.
The Pyrogrille 100 range is designed for approved apertures within:
The exact application, grille size, fire-resistance period and installation detail must be supported by the test or assessment evidence for the complete construction.
The Pyrogrille 100 has been tested within timber doorsets to:
BS EN 1634-1
The product range can offer up to 60 minutes’ fire integrity when installed within a suitable tested or assessed door assembly.
This does not mean that every size automatically provides 60 minutes in every fire door.
Before cutting an aperture into a door, confirm:
Cutting an unapproved aperture into a fire door can invalidate its fire-resistance evidence, certification and warranty.
The Pyrogrille 100 has also been tested within flexible walling and ducting to:
BS 476: Part 20
The range can provide up to 120 minutes’ fire integrity in suitable tested constructions.
The exact performance depends on factors including:
The grille must not be installed into an unverified partition or duct solely because the required aperture appears to be the correct size.
The published fire performance relates to integrity.
Integrity measures the ability of the tested system to restrict the passage of flames and hot gases.
The product should not automatically be described as providing an equivalent period of thermal insulation.
Where insulation performance is required, the complete separating element and grille arrangement must have evidence supporting that requirement.
The Pyrogrille 100 provides approximately:
60% free area
Free area is the proportion of the grille face that remains available for airflow under normal conditions.
The actual airflow through an installed grille also depends on:
The approximate free-area percentage should not be treated as a complete ventilation-system design calculation.
This product range has a fixed thickness of:
25mm
The slimmer profile can be suitable where the door, wall or duct construction cannot accommodate the wider 38mm Pyrogrille 100.
Only specific Pyrogrille sizes are manufactured in the 25mm thickness.
The current stocked 25mm range contains eleven square and rectangular sizes.
The grille incorporates graphite-based intumescent material supported within a galvanised steel construction.
When exposed to fire conditions, the graphite material expands and develops a stable char that closes the ventilation paths.
The intumescent material is:
The intumescent components must not be painted, cut, removed or obstructed.
The Pyrogrille 100 incorporates galvanised steel components.
These provide:
The grille should remain square and undistorted during cutting, handling and installation.
The Pyrogrille 100 operates through the thermal expansion of its intumescent material.
It contains no powered actuator, motor or mechanically operated damper.
The product therefore requires:
Periodic inspection and cleaning are still required to confirm that the grille remains unobstructed and undamaged.
The standard Pyrogrille 100 does not provide a cold-smoke containment function while the intumescent material remains unactivated.
It allows air to pass through the grille during normal ambient conditions. Cold smoke could therefore also pass through the same open air path.
For this reason, an air-transfer grille without a separate cold-smoke-control function must not automatically be installed within a fire-and-smoke door.
Before using it within a door identified as requiring smoke control, confirm that:
Do not describe the standard grille as cold-smoke rated.
The intumescent grille is normally installed within the aperture and may be concealed using compatible decorative cover plates.
Cover plates can:
Compatible Pyrocover 100 plates are sold separately and are not included with the Pyrogrille 100 unless expressly stated.
A cover plate should be selected to match the dimensions of the intumescent grille.
The current 25mm-thick stocked range includes:
Select the grille size according to both the ventilation requirement and the maximum aperture permitted by the fire-test evidence.
The stocked square options are:
Square grilles can be suitable where a relatively balanced width-to-height airflow opening is required.
The stocked rectangular options are:
Rectangular grilles can be useful where the available installation area or ventilation design requires a wider, lower-profile aperture.
The manufacturer states that the Pyrogrille 100 should not be used in areas exposed to high or constant humidity.
The product should not be:
Suitability should be confirmed before use in bathrooms, wet rooms, swimming-pool environments, commercial kitchens or other high-humidity areas.
Subject to the applicable evidence, the Pyrogrille 100 may be used in:
The fire strategy and complete doorset or wall evidence take priority over the general application list.
Before ordering, confirm:
Do not cut an aperture into a fire-resisting door, wall or duct until the selected grille and installation arrangement have been verified against the applicable evidence.
Pyrogrille 100 is a galvanised-steel and graphite intumescent air-transfer grille for use within approved apertures in fire-resisting doors, walls and ducts.
| Product Name | Pyrogrille 100 Air Transfer Grille – 25mm Thick |
| Current Supplier | Norseal |
| Product Reference | Pyrogrille 100 / PG100 |
| Product Type | Intumescent fire-resisting air-transfer grille |
| Stocked Thickness | 25mm |
| Applications | Approved apertures in fire-resisting timber doors, flexible walls and ducts |
| Normal Operation | Allows passive airflow through the open grille |
| Fire Operation | Graphite-based intumescent material expands and closes the ventilation openings |
| Frame Material | Galvanised steel |
| Active Material | Graphite-based intumescent material |
| Normal Appearance | Silver metal frame with black intumescent components |
| Approximate Free Area | 60% |
| Moving Components | None |
| Electrical Supply Required | No |
| Door Fire-Test Standard | BS EN 1634-1 |
| Maximum Published Door Integrity | Up to 60 minutes, subject to the tested doorset, grille size and installation arrangement |
| Wall and Duct Test Standard | BS 476: Part 20 |
| Maximum Published Wall or Duct Integrity | Up to 120 minutes, subject to the tested construction and installation arrangement |
| Performance Type | Fire integrity |
| Standalone Fire Rating? | No — performance applies only within an approved tested or assessed construction |
| Cold-Smoke Containment | No — the standard open grille does not restrict cold smoke under ambient conditions |
| Suitable for Fire-and-Smoke Doors? | Only where the complete doorset evidence includes an approved cold-smoke-control arrangement |
| Standard Fixing | Screw or pin securely through the grille’s side components |
| Predrilled Fixing Holes | Yes |
| Perimeter Fire Stopping | Pyromas A intumescent sealant applied around the perimeter on both sides under the manufacturer arrangement |
| Cover Plates Included? | No — matching decorative covers are available separately |
| High-Humidity Use | Not recommended for areas of high or constant humidity |
| Maintenance | No mechanical servicing; periodic inspection and wiping with a damp cloth are recommended |
| Water Immersion | Not permitted |
| Width × Height | Thickness | Shape | Product Code |
|---|---|---|---|
| 100 × 100mm | 25mm | Square | PG100/25/100X100 |
| 150 × 150mm | 25mm | Square | PG100/25/150X150 |
| 200 × 200mm | 25mm | Square | PG100/25/200X200 |
| 225 × 75mm | 25mm | Rectangular | PG100/25/225X075 |
| 225 × 150mm | 25mm | Rectangular | PG100/25/225X150 |
| 225 × 225mm | 25mm | Square | PG100/25/225X225 |
| 250 × 150mm | 25mm | Rectangular | PG100/25/250X150 |
| 250 × 250mm | 25mm | Square | PG100/25/250X250 |
| 300 × 150mm | 25mm | Rectangular | PG100/25/300X150 |
| 300 × 225mm | 25mm | Rectangular | PG100/25/300X225 |
| 300 × 300mm | 25mm | Square | PG100/25/300X300 |
The stocked product codes use the following format:
PG100 / Thickness / Width × Height
For example:
The current stocked range contains:
The wider manufacturer range also identifies additional dimensions as potentially available in 25mm thickness.
These include:
These dimensions are not included within the current stocked range listed above.
The approximate 60% free-area figure is based on the grille geometry.
It should not be treated as a complete ventilation calculation.
System airflow depends on:
The published fire periods represent maximum performance achieved within tested constructions.
The permitted performance for an individual project depends on:
The grille remains open during normal ambient conditions.
It therefore does not independently prevent the passage of cold smoke.
Do not use the standard Pyrogrille 100 in a smoke-control door unless the complete tested or assessed system includes an approved cold-smoke-control solution.
Optional Pyrocover 100 plates should match the nominal width and height of the selected grille.
Cover plates:
Store the Pyrogrille 100:
Inspect the installed grille periodically.
Check for:
The grille can be wiped using a damp cloth but should not be immersed in water.
Pyrogrille 100 is installed into a prepared aperture within a suitable fire-resisting door, wall or duct.
The exact aperture position, maximum size, lining arrangement, fixings and fire-stopping detail must follow the evidence for the complete construction.
Do not cut an aperture into a fire-resisting element until the proposed grille installation has been approved.
The exact tools and materials depend on the construction.
Typical requirements include:
Confirm:
Where the required evidence is unavailable, do not proceed.
For door installations, inspect the door identification and supporting documentation.
Confirm that the door leaf is permitted to contain an air-transfer grille.
The evidence should identify or support:
Do not rely solely on the nominal fire rating marked on the door.
Determine whether the door or separating element requires cold-smoke containment.
The standard Pyrogrille 100 remains open during normal ambient conditions and has no independent cold-smoke-control function.
Do not install it into a fire-and-smoke door unless the complete approved system includes the required smoke-control arrangement.
Check the supplied product code and physical dimensions.
Confirm that:
Do not enlarge the approved aperture to accommodate an incorrectly selected grille.
Mark the approved aperture position on the door, wall or duct.
Check the location in relation to:
Use the location required by the applicable test or assessment.
Measure and mark the aperture accurately using a square and straight edge.
The required opening dimensions and installation clearance should follow the current fitting instructions and supporting fire evidence.
Do not assume that the aperture must be oversized by a standard universal amount.
Check all dimensions before cutting.
For a door installation, remove the door where necessary and support it securely on a stable work surface.
Protect:
For walls and ducts, isolate and support the work area as required.
Cut the marked opening using tools appropriate to the construction.
Maintain:
Do not damage adjacent intumescent materials, reinforcement, studs, duct seams or essential ironmongery.
After cutting, inspect the opening.
Check for:
Stop work where the exposed construction does not match the expected tested arrangement.
Fit an aperture liner only where required by the supporting doorset, wall or duct evidence.
Do not automatically add or omit:
The lining detail must match the approved construction.
Remove:
The fixing and sealant surfaces should be clean, dry and sound.
Insert the grille into the prepared aperture without applying the final sealant.
Check that:
Do not force the grille into an undersized opening.
Use the grille’s predrilled side holes to mark the required fixing positions.
Confirm that each fixing will enter suitable surrounding material.
The fixings must not:
Remove the grille where required and drill suitable pilot holes.
Select the drill bit and fixing type according to:
Remove all drilling debris before installing the grille.
Apply the specified Pyromas A intumescent sealant, or the currently approved equivalent, around the grille perimeter as required by the installation detail.
The manufacturer arrangement requires the perimeter to be sealed on:
Both sides of the installation
Apply the sealant continuously so that no unsealed perimeter gaps remain.
Position the Pyrogrille 100 within the prepared aperture.
Check that:
Secure the system through the predrilled side components using the approved screws or steel pins.
Tighten or drive the fixings evenly.
Do not overtighten, as this may:
Inspect the sealant around both faces.
Fill and finish any remaining approved perimeter gaps.
The completed fire stop should be:
Where matching Pyrocover 100 plates are specified, fit a compatible plate to each required face.
Align each cover centrally over the intumescent grille.
Secure it using the supplied cover-plate screws.
Check that:
For a door installation, rehang the leaf and inspect its operation.
Confirm that:
For a wall installation:
Do not install into an unverified wall construction.
For duct installations:
Confirm that the ventilation-system design accounts for the grille’s approximate free area and pressure resistance.
Before completing the installation, check:
The Pyrogrille 100 has no moving parts and requires no mechanical servicing.
It should nevertheless be inspected periodically.
Check for:
Wipe the grille using a damp cloth where required.
Do not:
The Pyrogrille 100 does not possess a universal standalone fire rating.
Its performance depends on the complete installed system, including:
Install the grille only in accordance with current test evidence, assessment documentation and the instructions applicable to the complete construction.
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