Home > Companies > Colt International Ltd > AXS 140 Combined AOV Smoke Ventilator and Roof Access Hatch

Single flap smoke ventilator/ roof access hatch designed to provide either 1.0 or 1.5 m² measured free area in accordance with Building Regulations (E&W) Approved Document B Appendix C. Suitable for use as a staircase ventilator or roof mounted lobby/ corridor ventilator and to provide external roof access. Tested to and in compliance with BS EN 12101-2 and CE marked. Manufactured under the ISO 9001 quality and ISO 14001 environmental management standards.

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Standard product features


White RAL 9010. Standard 40 µm polyester powder coat thickness.


230 V AC, operated using a maintained supply from the fan control panel. The unit is complete with a 1.8 m flying lead.

Upstand/ Frame:

Thermally broken, 40 mm thick welded insulated and thermally broken aluminium. EN AW-6063 T6 (extrusion) and EN AW-3005 H14 (sheet) aluminium alloy.


Thermally broken aluminium frame with continuous seals for excellent airtightness. Opens to 140° from the horizontal.


Activation is by a 24 V DC linear actuator (drive in/ drive out), mounted on a pivoting carriage capable of opening the lid to the fire position of 140° from the horizontal within 60 seconds and of re-closing it.


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

Technical properties:

  • Reliability class: RE 1000 (10 000 cycles).
  • Wind load: <1500 N/m².
  • Snow load: <250 N/m².
  • Resistance to heat: B 300.
  • Low temperature class: T(-5).
  • Resistance to fire (to BS EN 13501-1): E.
  • U-value: <1.3 W/m²K (aluminium lid), <2.4 W/m²K (polycarbonate lid).
  • Air permeability (to BS EN 12207): Class 4.
  • Watertightness: Rain defence tested to 75 m/hr (at 13 m/sec).
  • Sound insulation: <29 dB R'w.

NBS Specification

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This product is associated with the following NBS Create clause:
90-45-80/340 Natural smoke and heat exhaust ventilators

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Colt International Ltd


+44 (0)23 9245 1111

Product reference

AXS140 Combined AOV Smoke Ventilator and Roof Access Hatch

Size (w x l)

[1000 x 1250 mm]
1.0 m² measured free area.
[1250 x 1500 mm]
1.5 m² measured free area.

Lid panel

[Aluminium, 40 mm thick]
[Polycarbonate, 10 mm thick]

Colour/ Finish

[Polyester powder painted, RAL]
Insert colour requirements.

Manufacturer details

Colt House,
Ridgeway Office Park,
Bedford Road,
Hampshire, GU32 3FQ
Tel +44 (0)23 9245 1111
Fax +44 (0)23 9245 4220
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