Passivent Airstract Roof Ventilation Terminal

Application

Used for passive stack ventilation applications in conjunction with Passivent Aircool facade ventilators. They can ventilate deep plan spaces and provide night cooling. Can also be used for multiple extract applications and mechanical extract outlets.

Description

A range of roof mounted natural ventilation terminals which combine low airflow resistance with excellent weatherability. They can be used as part of a sustainable, low energy natural ventilation strategy to provide an exhaust only outlet for used air. Also available with iAT - intelligent airflow technology for still, windless days, and unusual events such as high occupancy levels or unusual heat gains.


Features and benefits:


  • Robust terminal with cladding and louvres manufactured from high-impact ABS on an aluminium frame.
  • Unique patented double-bank louvre arrangement including 4mm insect mesh combines maximum rain rejection with good airflow performance.
  • Base unit constructed from marine grade plywood from renewable forests with an aluminium frame to mount the Airstract terminal on; can be insulated if required.
  • Fixed to roof structure (steelwork or timber) for maximum rigidity, and made weathertight with flashings (by others) before the terminal is fitted.
  • Flexible installation: Airstract terminals are suitable for use on flat and pitched roofs covered with profiled or standing seam sheeting, tiles or slates, and ‘green roofs’.
  • Motorised base dampers control the airflow, and are available with excellent thermal performance and airtightness levels.


Coefficients of discharge based on double-bank louvres with base

dampers - Airstract square/rectangular 0.57, Airstract circular 0.54.   


Wind resistance:

Resistant to continuous wind loads at 51m/s, demonstrated by independent BRE tests.


Airtightness:

Approx 9.7m3/hr/m2 at 50 Pa.                


Weather resistance:

External louvres have been independently tested at BSRIA to BS EN 13030: 2001 ‘Performance testing of louvres subjected to simulated rain’.

  • Class A 100% at 0.00m/s
  • Class A 100% at 0.50m/s
  • Class A 99.71% at 1.00m/s
  • Class A 99.06% at 1.50m/s


Acoustic performance

Air intakes sited at roof level generally allow in less noise. Acoustic treatment can be applied to Airstract and systems to deliver planned acoustic attenuation performance, based on independent testing by The University of Salford.


Available in square or circular designs.


Free Area (without base louvre):

  • 575 x 575 = 0.157m²
  • 575 x 800 = 0.246m²
  • 575 x 1025 = 0.319m²
  • 575 x 1250 = 0.368m²
  • 800 x 800 = 0.386m²
  • 800 x 1025 = 0.525m²
  • 800 x 1250 = 0.625m²
  • 1025 x 1025 = 0.716m²
  • 1025 x 1250 = 0.906m²
  • 1250 x 1250 = 1.030m²


Free Area (with base louvre):

  • 575 x 575 = 0.064m²
  • 575 x 800 = 0.101m²
  • 575 x 1025 = 0.139m²
  • 575 x 1250 = 0.176m²
  • 800 x 800 = 0.182m²
  • 800 x 1025 = 0.249m²
  • 800 x 1250 = 0.316m²
  • 1025 x 1025 = 0.331m²
  • 1025 x 1250 = 0.421m²
  • 1250 x 1250 = 0.561m²


Bespoke Airstract terminals can also be manufactured in aluminium. These provide even greater airflow performance whilst still featuring the patented double-bank louvres for maximum weather protection. A wide range of larger sizes available too. Enquire for more details.

General information

Color

A range of RAL and BS colours. Consult manufacturer.

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Finish

Polymeric resin

ABS.

Polyester powder coated

Aluminium.

Material

Acrylonitrile butadiene styrene (ABS)

Aluminium

Shape

Square

Circle

Size

575 x 575 mm

575 x 800 mm

575 x 1025 mm

575 x 1250 mm

800 x 800 mm

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Uniclass 2015

Ss_65_40_33_56 Natural ventilation systemsPrimary

Specification data - Natural ventilation systems Enhanced data

System performance

Natural ventilation design.

Ventilation inlet openings

Dampers and louvres.

Actuators

Damper actuators.

Exhaust path

Pre-insulated ductwork and fittings.

Ventilation outlet openings

Roof stack air terminals.

Accessories

Not required.

Acoustic lining.

Controls

Natural ventilation control systems.

Ventilation opening control

Sensor-controlled.

Execution

Installing natural ventilation systems.

System completion

Commissioning of air distribution systems.

Fire resistance

To BS 476-3, AA.

Environmental information

Contains Red List materials

No

Country of product manufacture

United Kingdom

Digital objects

Platform Compatible Version Certified to
Revit
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1

1

Download now from NBS National BIM Library

Literature

Passivent Specification Document - Airstract Roof Ventilation Terminal

Passivent Specification Document - Airstract Roof Ventilation Terminal

Passivent Literature - Roof Ventilation Terminals

Passivent Literature - Roof Ventilation Terminals

Passivent Literature - Roof Ventilation Terminals for Sports Halls

Passivent Literature - Roof Ventilation Terminals for Sports Halls

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