Enables free air flow through fire resisting doors and compartment walls
In the event of fire the grill expands to fill the void and prevent flow of fire and hot gases
Tested to BS476 part 20 / part 22:1987 and approved for use on 30 and 60 minute fire doors
Free air flow of 614 sq cms
Use in conjunction with vent cover of the same size to provide a clean finish to the opening
Product Specification:
| Exact finish |
Silver |
| Exterior use |
Interior |
| Finish group |
Silver |
Next working day delivery is available on products marketed as "Next Day" and when placed before 5pm Monday to Friday. Orders containing "Next Day" and "2/3 Day" products (or other slower services e.g. "Custom Made") will be delivered in line with the slower product.
FREE Delivery on orders over £30.00. Orders under £30.00 will be charged £4.95 for delivery (plus any long length charges as detailed below)
Longer length products with have an additional delivery charge for orders under £75. For 2 day services there will be a £5.00 surcharge (if under £75), Next day delivery will have a £20.00 surcharge (This is waived for orders over £200)
You will be provided with clear tracking to track your order.
How long do intumescent vents last?
Intumescent materials typically last for the life of the door, if they are not damaged or exposed to conditions that could degrade them, for instance vandalism and tampering, extreme moisture or physical wear. It's important to inspect the pads periodically during regular fire door maintenance.
Why do I need to fit intumescent vents?
Enhanced fire safety: When ventilation is required they help to contain fires, preventing them from spreading rapidly
Smoke and gas protection: Intumescent vents can, after being exposed to heat, prevent smoke and harmful gases from leaking through gaps
Cost-effective: They are an affordable fire safety measure compared to buying pre made / hung door sets and frames
Legislation: When ventilation is required in a fire door, fitting intumescent vents is a legal requirement. Fire door hinge fire test evidence is gained when intumescent hinge pads are fitted
Easy installation: They can be retrofitted into existing doors and frames
What is an intumescent vent?
An intumescent vent is a fire-rated vent manufactured from heat-sensitive intumescent material. The intumescent material will expand when exposed to heat to seal fire doors and prevent the spread of fire.
Where are intumescent vents used?
- Fire-rated doors: To provide ventilation while maintaining the fire-resistance rating
- Ductwork and shafts: To allow air circulation without compromising fire safety
- Fire compartments: In buildings where smoke and heat need to be controlled to prevent the spread of fire
How does an intumescent vent work?
The intumescent vent is a fire-rated vent manufactured from heat-sensitive intumescent material. Normally, the vent remains open to allow air flow. When exposed to high temperatures, the intumescent material expands, sealing the vent and preventing smoke and flames from passing through.
How do I fit intumescent vents?
- Cut the aperture in the door
- Line the aperture with a 6mm hardwood liner
- Apply a bead of our intumescent acrylic sealant centrally and spread the sealant across the full width of timber liner, to achieve a thickness of 0.50mm
- Install the grille into the aperture
- Secure the system into place using steel pins (not supplied). Alternatively, secure the system using self-tapping screws
- Fit cover plates on both faces of the door
How do I order intumescent vents?
Free air flow requirements is normally what is specified by the architect, alternatively it's as simple as knowing the size of the hole in the door.
We state online and, in our catalogue, both free air flow and overall size.
Importantly the vents are sold separately to the grille cover so don’t forget to order either 1 or 2 grille covers for 1 or both sides of the door.
Why are intumescent vents important?
Intumescent vents are designed to manage the balance of fire safety with the need for ventilation. Without these vents, fire-resistant barriers could become ineffective due to the lack of airflow, leading to heat buildup, smoke accumulation, or even system failure. Intumescent vents ensure that fire protection is maintained without compromising the building’s ventilation needs.
Grenfell & Changing Landscape of Responsibility
On 14th June 2017, the Grenfell Tower fire spread primarily through its external cladding, tragically killing 72 people. The Grenfell Tower Public Inquiry identified matters of concern relating to construction products including the testing and certification of materials, design and choice of materials, fire doors and smoke extraction systems.
The resulting information has changed the landscape of responsibility, holding individuals responsible for their actions.
Do intumescent vents need maintenance?
Like all fire safety devices, intumescent vents should be inspected regularly to ensure they function properly. Maintenance includes:
- Ensuring the vent is not blocked or obstructed
- Checking the intumescent material for signs of damage
- Testing that the vent closes properly under heat conditions
- Replacing or repairing the vent as needed
How do intumescent vents differ from regular vents?
The main difference is that intumescent vents are designed to react to heat and close automatically during a fire, whereas regular vents do not provide any fire protection. In contrast, traditional vents could allow fire and smoke to pass through freely, compromising safety in the event of a fire.
Are intumescent vents suitable for all building types?
Intumescent vents are suitable for most commercial and residential buildings, especially those with fire safety requirements. However, the specific installation requirements and product certifications may vary depending on the type of structure, the level of fire protection needed, and local fire offer requirements. Check if you are unsure.
Whose responsibility is it to fit intumescent vents?
Our Responsibility: Offer and guide customers through fire door ironmongery legislation and offer tested and accredited fit for purpose products
Your Responsibility: To fit appropriate tested and accredited ironmongery when fire doors are required
Joint Responsibility: Communicate effectively to ensure correct specification, selection, fitting and maintenance of ironmongery fitted to fire doors. If you're not sure, please ask us
“More importantly still, I think you need to examine why you are doing this. You should be doing this because it’s the right thing to do. Not because legislation make you do it.”
Dame Judith Hackett
Are intumescent vents fire rated?
Yes, as you would expect, our intumescent vents are fire-rated and come in various sizes for free air flow requirements.
Our air transfer grille system (vent and grille covers) are tested to BS476 part 20/part 22:1987. - 30 and 60 minute rated.
Do intumescent vents require special handling or storage?
Intumescent vents should be stored in a cool, dry place and protected from damage. They do not require special handling, but care should be taken to avoid exposing them to extreme conditions like heat and moisture prior to installation.
How do I maintain intumescent vents?
The vents themselves don’t require active maintenance, but they should be checked periodically to ensure they are not compromised. If the door or hinges are removed or replaced, the hinge pads should also be inspected and replaced if needed.
Can intumescent vents be used with other fire-seal materials?
Yes, intumescent vents are almost always used in combination with other fire-sealing materials like intumescent strips, fire-rated glazing, or door sweeps to enhance the overall fire protection of a door assembly.
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