What are Passivent Roof Ventilation Terminals?
Passivent Roof Terminals are a range of roof mounted ventilation products comprising:
· Airscoop®.
· Airstract®.
· Airstract® iAT.
· Hybrid Plus Airstract®.
· Litevent Airstract
Passivent Airscoop® (with or without low level inlets) is a range of roof mounted natural ventilation terminals which provide displacement (or top down) ventilation using wind power only. Suitable for buildings with large open areas, deep plan spaces and open plan top floors.
In addition to the Passivent Airscoop, using low level motorised louvres (such as the Passivent Aircool façade ventilators) or manual opening windows/doors can provide assistance to the system during low wind speed periods.
Designed to 'capture' prevailing wind and direct it via four separate chambers within the terminal to the space beneath. The optimised segmented design delivers maximum airflow capacity with minimal pressure drop through the system and the complete separation of chambers prevents 'short circuiting'.
System to comprise: ABS Airscoop terminal with internal dividers is fitted to an Airscoop base unit. The base unit is extended into the building to house the insulated base motorized controllable damper unit. All necessary flashings, secret gutters etc to be provided and installed by others.
Passivent Airscoops are covered by a 15 Year No Leak Guarantee. No annual servicing is required for this guarantee as there are no mechanical/electrical items such as actuators, within the terminal to maintain, therefore no external/roof access is required.
Passivent’s Airstract® (with low level inlets) roof-mounted natural ventilation terminal combines low airflow resistance with high airflow capacity providing an exhaust outlet for used air. The natural forces of buoyancy, wind and convection move the air and minimal power is required.
Used for passive stack ventilation applications in conjunction with low level motorised louvres (such as the Passivent Aircool façade ventilators), they can ventilate deep plan spaces and provide night cooling. They can also be used for multiple extract applications and mechanical extract outlets.
System to comprise: ABS Airstract terminal is fitted to an Airstract base unit. The base unit is extended into the building to house the insulated base motorized controllable damper unit. All necessary flashings, secret gutters etc to be provided and installed by others.
Passivent Airstracts are covered by a 15 Year No Leak Guarantee. No annual servicing is required for this guarantee as there are no mechanical/electrical items such as actuators, within the terminal to maintain, therefore no external/roof access is required.
Passivent Airstract® iAT (intelligent Airflow Technology) (with low level inlets) roof mounted ventilation terminal has all the features and benefits of the standard Airstract terminal in addition to energy efficient mechanical assistance.
Used for passive stack ventilation applications in conjunction with low level motorised louvres (such as the Passivent Aircool façade ventilators), they can ventilate deep plan spaces and provide night cooling. They can also be used for multiple extract applications.
During peak summer temperatures the minimal temperature difference between indoors and outdoors can result in low flow rates for passive stack ventilation, especially on still, windless days. The control system activates the low energy fan and maintains the ventilation system performance until either the temperature or CO2 levels have achieved the targeted set point.
System to comprise: ABS Airstract iAT terminal is fitted to an Airstract iAT base unit. The base unit is extended into the building to house the low powered sweep fan and insulated base motorised controllable damper unit. All necessary flashings, secret gutters etc to be provided and installed by others.
Passivent Hybrid Plus Airstract® (with low level inlets) roof-mounted terminal has all the features and benefits of the standard Airstract terminal as well as an innovative air tempering and mixing unit utilising a single low power sweep fan.
Used for a range of ventilation applications, particularly on upper floors of buildings where direct perimeter ventilation is limited or undesirable. Also suitable for large open buildings such as sports halls and auditoriums.
A number of different modes can be programmed to allow the most energy efficient option to be used as and when required.
1. In natural or passive mode when the fan does not operate it acts as a passive stack
2. In peak summer temperatures to avoid overheating, enhanced (or boost) mode allows for high levels of air movement. Based primarily on natural ventilation strategy so does not require large and costly mechanical plant. It can also purge the space more rapidly at times of unusual high building occupancy when there are excessive CO2 levels or heat gains.
3. In low winter temperatures to avoid draughts, the recirculation (or mixing) mode mixes incoming fresh air with interior warm air to provide tempered fresh air to the space.
System to comprise: ABS Hybrid Plus Airstract terminal is fitted to an Hybrid Plus Airstract base unit. The base unit is extended into the building to house the mixing chamber, low powered sweep fan and insulated base motorised controllable damper unit. All necessary flashings, secret gutters etc to be provided and installed by others.
Passivent Airstracts are covered by a 15 Year No Leak Guarantee. No annual servicing is required for this guarantee as there are no mechanical/electrical items such as actuators, within the terminal to maintain, therefore no external/roof access is required.
Passivent Litevent Airstract® Rooflight/Ventilator (with low level inlets) combines a controllable ventilator and a rooflight in one unit for installation on flat or low-pitched roofs. The added natural daylighting reduces the need for artificial lighting, thereby further reducing energy expenditure.
Used for passive stack ventilation applications in conjunction with low level motorised louvres (such as the Passivent Aircool façade ventilators), they can ventilate deep plan spaces and provide night cooling. They can also be used for multiple extract applications.
System to comprise: Aluminium upstand with insulated core, incorporating insulated ventilation doors on all four sides, controlled by modulating linked actuators. The glazing is a triple-skin polycarbonate glazing with vented air gap. All necessary flashings, secret gutters etc to be provided and installed by others.
All Passivent Roof Terminals can provide secure night-time cooling and where provided have exceptionally low specific fan powers.
All Passivent Roof Terminals can be controlled by a range of Passivent controls including the intelligent and fully automatic iC8000 control system. This modulates the opening of the roof terminals depending on the season, external/internal temperature conditions and indoor air quality (IAQ) to ensure the lowest possible energy use - in terms of both the energy consumption of the ventilation system and overall building energy usage.
