AXS 140

Combined AOV smoke ventilator and roof access hatch

AXS 140 is a combined AOV smoke ventilator and roof access hatch providing either 1m2 or 1.5m2 minimum free area in accordance with Approved Document B, Appendix C.

It is suitable for use as a staircase ventilator or roof mounted lobby/corridor ventilator to provide external roof access. It has been tested to and is in compliance with BS EN 12101-2 and is both CE and UKCA marked. It is manufactured under the ISO 9001 quality and ISO 14001 environmental management standards.

To learn more about AOV systems, check out our AOV Systems page.

Features and benefits

  • A wide range of applications
  • Weather resistant
  • Durable
  • Large opening angle
  • Certified performance
  • High thermal performance
  • High acoustic performance
  • Low silhouette

Read more


The following performance attributes follow tests to EN 12101-2:2003 (standard for smoke and heat exhaust ventilators). The exact performance attribute will depend on the chosen size, controls, and flap type.

  • Reliability: RE 50 (1,000 cycles)
  • Wind load: 1500 N/m2
  • Snow load: 250 N/m²
  • Resistant to heat: B 300
  • Low temperature class: T(-5)
  • Materials reaction to fire (to EN 13501-1_:
    • Aluminium Lid - A1
    • Polycarbonate Lid - B-s2, d0
    • Perimeter seals - E
  • U value:
    • Up to a maximum of 1.3 W/m²K (aluminium lid version)
    • 2.4 W/m²K (polycarbonate lid version)
  • Watertightness: rain defence tested to 75m/hr @ 13 m/sec
  • Air permeability: Class 2/3 (depending on unit specification) to BS EN 12207:2000
  • Sound insulation: 29 dB R’w


  • Dimensions / size range
  • Flap options
  • Colours/ finishes options
  • Fixing options
  • Controls options

Read more

AXS140 - NBS Specification


Tested to and in compliance with EN 12101-2 and CE marked and UKCA marked.


AXS 140 combined AOV smoke ventilator and roof access hatch

A wide range of applications - AXS 140 is installed onto roofs providing high level smoke control extract as well as roof access. Its polycarbonate flap option allows the entry of natural daylight.

Weather resistant - The sealing system consists of EPDM profiles which keep air leakage down to a minimum.

Durable – The AXS 140 flap is manufactured from tough, corrosion resistant aluminium with aluminium hinges and stainless steel pivots. It is manufactured under the ISO 9001 quality standard.

Large opening angle – AXS 140 opens to 140⁰ which permits it to meet the requirements of EN 12101-2 for this kind of product.

Certified performance - AXS 140 has been tested and certified to EN 12101-2: 2003 in accredited third party test laboratories and is CE and UKCA marked.

High thermal performance – Thermal performance varies with size and options, ranging from 1.3 to 2.4 W/m²K.

High acoustic performance – A sound reduction of up to 29 dB (R’w) may be achieved.

Low silhouette - No ugly and inconvenient wind deflectors are needed.


Dimensions / size range

  • (S) 1250 x 1000 (throat dimensions)
  • (L) 1250 x 1500 (throat dimensions)

Flap options

  • Thermally broken aluminium frame and insulated aluminium panel
  • Thermally broken aluminium frame and polycarbonate panel

Fits tightly to frame with continuous EPDM seals for excellent airtightness. Opens to 140⁰ from the horizontal.

Colours/ finishes options

  • Mill finish
  • Polyester powder painted to a RAL colour, standard 40 mu.


Fixing options

Fixing flange for curb. Installation angle must be at 0° (horizontal).

Controls options

24 V DC linear actuator (drive in / drive out)


S Version

L Version

Measured free area (m2)



Throat width (mm)



Throat length (mm)



Overall width (mm)



Overall length (mm)



Clearance for flap from base edge (mm)



Weight (Kg)