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Airtight

Seal the Envelope,
Hit the Numbers.

Air leakage destroys energy performance. Our airtight access panels, riser doors and loft hatches are independently tested to BS EN 1026 with documented air permeability values — helping projects hit Part L, BREEAM and Passivhaus airtightness targets at every penetration.

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EN 1026
Test Standard
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Test Pressure
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UK Manufactured

An airtight building envelope is essential for energy performance, occupant comfort, and condensation control. Every penetration through the envelope is a potential leak path. Airtight-rated access products are independently tested under BS EN 1026 to verify air permeability stays low under pressure — giving Passivhaus assessors and Part L calculations the data they need.

Last updated: May 2026 · Reviewed by Rapid Access Technical Team

The Basics

What does airtight mean?

An airtight product limits the volume of air that can pass through it under a pressure difference. Performance is measured in cubic metres per hour per square metre (m³/h·m²) at a standard test pressure, typically 50 Pa or 100 Pa.

BS EN 1026 test
The product is mounted in a test rig and air is pumped to create a pressure differential. The leak rate at multiple pressures (10-600 Pa) is measured and classified.
Why it matters
Part L of the Building Regs sets backstop air permeability values for new buildings. Passivhaus is stricter still — 0.6 air changes per hour at 50 Pa. Hitting either requires every penetration to be sealed and verified.
Class 4 — the standard target
The classification in BS EN 12207 most commonly specified for high-performance access products. Independent test reports confirm the value supplied.
Product Coverage

Which products offer this performance?

Live coverage across our four product categories, drawn from the PIM master record.

Access Panels

6
ranges
  • FlipFix Metal Door Access Panel – Picture Frame
  • FlipFix Metal Door Access Panel – Beaded Frame
  • Reduced Ligature Metal Access Panel with Picture Frame
  • R55 Metal Faced Ceiling Access Panel
  • R56 Plasterboard Dual Purpose Access Panel
  • R13 Metal Dual Purpose Access Panel
View product range

Riser Doors

5
ranges
  • Metal Riser Door with Picture Frame
  • Metal Riser Door with Beaded Frame
  • Metal Riser Door Fire Rated From Both Sides – Picture Frame
  • Metal Riser Door Fire Rated From Both Sides – Beaded Frame
  • Plasterboard Riser Door with Beaded Frame
View product range

Loft Hatches

2
ranges
  • Insulated Metal Loft Hatch – Picture Frame – U Value 0.760 W/m²
  • Insulated Metal Loft Hatch – Beaded Frame – U Value 0.760 W/m²
View product range

Meter Overboxes

No products in our current range offer this performance.

Test Standards

Independently tested

Every claim on this page is backed by an accredited test report supplied free with every order.

BS EN 1026:2016
Windows and doors — air permeability — test method. The standard test for access panel and riser door air leakage.
BS EN 12207:2016
Windows and doors — air permeability — classification (Class 1-4). Class 4 is the high-performance target.
ATTMA TSL1 / TSL2
UK on-site airtightness testing protocols — relevant when the building is pressure-tested at completion.
Where it's required

Building Regulations & Standards

UK regulations and codes that specify where this performance is required.

Approved Document L (Conservation of fuel and power)
Sets maximum air permeability values for new dwellings and non-domestic buildings. Achieving the design figure requires sealed envelope products including access panels and loft hatches.
Passivhaus Standard
Demands ≤ 0.6 air changes per hour at 50 Pa — achievable only with rigorously tested airtight products at every envelope penetration.
BREEAM HEA 05 (Acoustic) / ENE 01
Energy and indoor environment credits reward measured airtightness performance.
Made in Britain

Formed, Welded, Coated & Tested
Under One Roof

Every panel, door and hatch is manufactured at our own facility in Nuneaton. No outsourcing, no middlemen, full control over quality and lead time.

Operator running an Amada press brake to form steel access panel components
01 CNC press-braked steel
MIG welding a riser door frame on the fabrication bench
02 MIG-welded frames
Access panels on the overhead conveyor of the in-house powder coating line
03 In-house powder coating
Final inspection of an assembled riser door before despatch
04 Inspected before despatch
See inside the factory
FAQ

Common questions

Answers to the questions specifiers and Building Control most often ask.

Test results are reported in m³/h·m² at a stated pressure (usually 50 Pa or 100 Pa). Lower = more airtight. A Class 4 product under BS EN 12207 will leak no more than 3 m³/h·m² at 100 Pa.
No. Airtight is an energy/envelope test under quasi-static pressures. Smoke-rated is a fire-safety test that simulates smoke leakage under fire conditions. Many of our products are tested for both, but the tests and certifications are independent.
If the loft hatch sits in the insulated envelope (most do), then yes — a poorly-sealed hatch is one of the biggest single point leaks in a domestic envelope. Airtight loft hatches with documented test data are the safe choice for any project pressure-tested at completion.
Our airtight seals are designed for the life of the building and are typically replaceable. Routine inspection at handover and during periodic fire-door checks confirms the seal remains intact.
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