ANNOUNCEMENT :     The Big 5 Construct Saudi 2024 : 26-29 February 2024 @ Riyadh Front Exhibition & Convention Center, Booth No. 3C110

Natural smoke and heat exhaust ventilation systems (NSHEVS) are designed as safety equipment that would save lives and reduce the destruction of properties. It will work by the upward current of the fume atmosphere. The smokes produced by fire are to be discharged from inside to outside of the building by automatically or manually opening smoke ventilation systems. In the event of a fire, the fire raised the temperature of the room from ambient to hazardous zone. This creates heat buoyancy, which in turn generates a pressure difference within the room, in negative pressure at the floor level and positive pressure below the ceiling or under roof level.

The pressure difference causes the outside fresh air to flow in through the supply air jet stream openings in the lower level of the hall and air to flow out through NSHEV (Natural Smoke and Heat Exhaust Ventilators) in the upper roof area or wherever it was located.



Roof Mounted Twin


Roof Mounted Single


Wall Mounted




Aluminium Extruded Frame System

Alloy 6063 T5/T6

Standards: - BS EN 12020-2-2008, BS EN 755-9-2008 & ASTM-B-221-12

Aluminium Sheets

Alloy 1100 / Alloy 3003 / Alloy 5005

Standards: - ASTM-B-209/209M

Glazing / Translucent Sheets (Options)

Single and double wall glazing up to 32mm (T)

Polycarbonate sheets

Single layer or multilayer up to 48mm (T)

Insulation Material

Rockwool - ASTM C167, ASTMC612, ASTM C871, UL723/ASTM E84, EN13501-1:2007 & EN ISO 1182-2010


24VDC Linear drive, 230Volts Actuator, Thermal latch & Pneumatic actuator

Standard : EN 12101-2

Failsafe option

UL Tested fusible link


Powder Coating:- BS6496, AAMA2605-PVF2; AAMA2604-SDF,

AAMA2603-PEF ; Colors: RAL Standard

Anodizing:- BS EN ISO 7599:2010 (Matt / Metallic)


The performance of NSHEVS is tested and certified complying with EN12101-2: 2003. The precise performance attribute will depend on the preferred dimension, control system, type of flap, and installation orientation CE Markings and Fire Safety Certification.

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Performance Value

Resistant to Heat (Annex G) B300 30
Aerodynamic Coefficient (Annex B) Up to 0.70
Reliability (Annex C) Re 1000 (10,000 cycles)
Wind Load (Annex F) Up to 9000 N/m²
Resistance to fire E by EN 13501-1
U value Up to 0.20 W/m²K
Low-temperature class T(00) to T(-15)
Air permeability Class 4 by EN 12207
Water tightness class 9A by EN 14963
Resistance to wind load Class 5C by EN 12210
Sound Rating 35 to 49 dB Rw