Innovation built on experience

Ventient SCW-NS

Proctor Ventient SCW-NS Trickle Vent

with passive temperature sensing flow


Product Description

The Ventient SCW-NS is precision manufactured aluminium trickle vent that can be accommodated into a wide range of curtain wall and window frames.

The Ventient passive shape memory technology, without electric power, sensors or human intervention, automatically controls ventilation flow dependent on ambient temperatures, optimising the benefits of passive ventilation.


Improvements in construction create buildings that are more airtight than previously, with the result that infiltration or leakiness is no longer providing a pathway for make-up air for exhaust systems.

Although many building are complying with building code requirements by having sufficient openable windows, changing lifestyle patters, concerns about noise and security and generational differences mean that ventilation from open windows tends to be infrequent.

Unlike conventional systems such as operable windows or louvres, Proctor Ventient SCW-NS can get on with the job of providing fresh air circulation regardless of occupancy.

As part of the total ventilation system Proctor Ventient can provide continuous ventilation to spaces even if they are unoccupied and is perfect for  student accommodation, hotels, age care, healthcare and educational facilities.

Ventient is an ideal solution for residential buildings such as modern air tight homes and medium or high rise developments, as modern lifestyles mean that occupants are unable to mange purge ventilation and often  return home to a stuffy environment.


The Ventient SCW-NS is installed into a custom designed head, transom, sill or jamb of curtain wall or other window frames. The vent should be completely serviceable from the interior.

SCW-NSW Trickle Vent

Exhaust Make-up in Lieu of Supply

Where it is not possible to meet the code requirements for natural ventilation, or where the design preference is for a specific air change rate and 24 hour provision of fresh outside air without leaving windows open,  Ventient, in conjunction with low energy, mechanical extract ventilation can provide or contribute to supply ventilation as required when calculated in accordance with AS1668.2.


General Exhaust Make-Up Air

AS1668.2 draws to the attention of designers that increased air-tightness of modern buildings requires consideration of sources of make-up air.   Make-up air drawn through gaps and service penetrations does not meet the requirements of Clause 2.3 within the standard and can lead to the loss of amenity in the enclosure.

Ventient SCW-NS could be an acceptable permanent natural ventilation opening as required in Clause 2.3.

Sample Specification

Install Proctor Ventient SCW-NS Trickle Vent with shape memory alloy passive temperature sensing flow control, in accordance with the user guide.

Device Length: ________mm (L1 from figure 1)

Cover length: L2 _____mm &  L3 ____mm  (see figure 1)

Optional features:  (from table 2)


Ventilation volume at ⊿P12Pa: (from PQ data)

Colour:  (from table 1)

SMA Minimum Temperature: 12°C (other temperatures available)

Table 1 Performance 
Open area (A)65cm2 – 259cm2
Effective open area (αA)20.7cm² – 81.9cm²
Air Tightness (JIS A 1516) when closed<0.38m³/hr.m² at 100Pa
Water tightness (JIS A1517) when closed1,500Pa
Wind pressure (JIS A1515) when closed3,600Pa
Acoustic Ratings (JIS A4706)T-2

Standard Sizes and Colours 

Minimum Length (L1)500 mm
Maximum Length (L1)1,500 mm
Dimensional tolerance (L1)± 1 mm
Standard available colours for main unit in gloss or matt anodised finish. Removable interior face cover also available in mill finish.

Table 2 Optional Features
Shape Memory Alloy (SMA)

Thermal Actuator

– Fully Open

– Minimum Open  (typically 33%)

Other set points are available




Other set point are available

 Mesh to resist vermin, insects and windblown material.Available with max. 2mm aperture.1

Location depends on installation


Air filter (average arrestance)

– Type B


Manual Operation

– Closable

– Openable



Standard (Auto mode)

Intumescent fire barrier Available option
Additional acoustic attenuation Available option 2

Interior face cover can be removed from the interior to clean the device and filter.

 Constant air flow dampeningDamper attachments available to manage high positive and negative wind loads.


1 Location of mesh depends on installation but is usually toward the external face of the fixing frame.

2 Acoustic attenuation options are available with optional internal covers or within the framing.

*Note that the degree of opening may not always reflect the exterior temperature, as this will periodically differ from the ambient temperature where the SMA actuator is located closer to the interior. There is also a lag in adjustment to sharp changes in temperature.

The details supplied here are based upon good practice and currently available information. Advice regarding this product should be taken as a guide only. We reserve the right to change product specification without notice so please refer to our website for the latest version of this document.  Please contact us to discuss your project and any technical enquires.