Page 1

Introduction Ventive PVHR is a Passive Ventilation system with Heat Recovery. It provides a continuous supply of fresh air to the house pre-warming it with the heat extracted from the outgoing stale air. It achieves this passively, without the use of electricity. It also has no moving parts or electronic components that would result in noise or maintenance requirements of mechanical ventilation systems. Ventive prevents the occurrence of condensation and mould in homes keeping the indoor air free of pollutants such as carbon dioxide, VOCs and excess humidity. It creates a healthy indoor environment while keeping it warm. By doing so it allows excellent levels of airtightness without compromising on indoor air quality or energy efficiency.

Ventive is a ground-breaking ventilation product that can help housing providers, selfbuilders, architects and home owners achieve the highest levels of energy savings while ensuring good indoor air quality and comfort for the occupants.



Passive Airflow

1 Air Exchange every 1-2 hours

Passive Heat Transfer

Up to 95% heat recovery

Natural Operation

No moving parts No electronic equipment

Benefits No condensation & mould Clean, Healthy air Improved Wellbeing Warm home No draughts Up to ÂŁ200 heating savings No running cost Up to ÂŁ100 Electricity Saved No servicing/maintenance

Application Ventive uses two abundant forces of nature - passive stack effect (warm air rising) and wind, to silently drive temperate fresh air into the building. In traditional properties it can utilise existing chimney breasts as air channels to simplify retrofit installation.

Ventive can also be used for new buildings as the sole ventilation measure continuously providing fresh, pre-warmed air to every room. Both with existing and new buildings, reasonable airtightness is required for optimum heat recovery efficiency.



Wind-assistance helps drive fresh air into system


Omni-directional Cowl dissipates stale air to atmosphere


Up to 95% heat is recovered in dual-flow heat exchanger


Natural Air Buoyancy drives the process


Fresh, pre-warmed air enters the room, pulled by the escaping stale air and assisted by the wind

Installation Ventive S: Single PVHR unit retrofitted into chimneys Installation of Ventive S takes approximately half a day per unit, depending on site conditions and access. Two flexible ducts are pulled through the chimney with the lower grill or fireplace acting as a supply vent and the new opening at high level acting as exhaust. In general, reqirements range from two to six units depending on the size of the house or its airtightness. Please refer to Ventive S Installation Manual for more details.

Ventive S+: PVHR unit with twin duct for retrofit & new build Installation of Ventive S+ takes approximately 6 hours per unit depending on complexity (with new build projects being quicker and easier to integrate than retrofits). Separate 200x60mm ducts are run for each flow channel with the heat exchanger mounted in the loft space. Please refer to Ventive S+ Installation Manual for more details.

Ventive and Social Landlords Our Passive Ventilation system with Heat Recovery provides a low maintenance solution to condensation and mould, lowering energy bills for the tenant and improving the energy efficiency of the property.

Condensation, mould and Indoor Air Quality (IAQ) Condensation-related workload adds to operational cost. With dedicated staff and both planned and responsive maintenance programmes set up to deal with the issue, hidden condensation related expenditure may exceed 10% of a Landlord’s annual budget. Quite often the reactive measure is to draught proof and insulate the building in order to prevent heat loss and reduce cold surfaces where condensation occurs. On its own this will have a detrimental effect on air quality and in some cases may exacerbate the damp problem. Conversely, using crude ventilation methods such as extract fans will reduce savings from energy efficiency measures in place.

The true cost of the wrong solution Until now, less sophisticated solutions such as Mechanical Extract or Positive Input Ventilation have been used to treat condensation issues, using electricity to drive warm air out of the home and draw cold air in, with tenants reporting cold draughts and noise. This approach increases household energy use which is paid for by the tenant, a vulnerable demographic already facing rising fuel bills and a higher cost of living. The commonly seen result is tenants switching off or blocking up mechanical devices to deal with draughts, noise or perceived cost, negating the effectiveness of the installation and impacting on their health and the fabric of the building. Ventive resolves this airtightness and air quality conundrum by creating a healthy indoor environment at no cost to the tenant without lifestyle changes and without any additional maintenance or servicing requirement of the Landlord.

Case Study South Essex Homes have chosen Ventive S+ PVHR units for Peartree Close flats as part of the “Really Smart House” refurbishment scheme in Southend-on-Sea. Each apartment also received improved insulation, new glazing, LED lighting and a new heating system.

The main objective was to provide the occupants with the lowest maintenance heat recovery ventilation and Ventive offered the best solution. This is enabling South Essex Homes to impact on local fuel poverty and to improve their tenants’ indoor environment at the same time. The project was completed in July 2013 and the tenants have reported a noticeable improvement in the comfort of their homes, which now feel warmer, fresher and healthier while saving them money on fuel bills. The team at South Essex Homes was so pleased with the level of service as well as the ventilation solution provided by Ventive that it has now identified a number of follow on properties for installation of our PVHR system.

Working with Ventive Value Added Solution Our team is ready to help you with your project to ensure its success. Support can include design, Building Control specification, engineering drawings, and installation on site. Working from our two offices in West London and Birmingham, we are ready to assist you with your New Build or Retrofit project whether it’s a one off or part a larger scheme.

Benefits of working with Ventive:       

RIBA accredited CPD programme Free survey and advice In house design team Installer training and site assistance Readily available technical help Option of remote performance monitoring Best in class energy savings

Contact us today to book your survey or to request additional information: London Office: 0208 560 1314; Thames House, Swan Street, Old Isleworth, London, TW7 6RS West Midlands Office: 0121 250 5707; Faraday Wharf, Holt Street, Birmingham, B7 4BB

Technology behind Ventive Omni-Directional Roof Cowl 1

Air movement through cowl assists the extraction of stale air and dissipates it into the atmosphere



Fresh air is actively driven into the system, with additional draw created by the stale air leaving the room


Stale air is extracted from the house by the combination of passive stack effect and wind assistance

2 3


As stale air passes through the Heat Exchanger, between 80 and 95% of heat is recovered into the supply air


The innovative shape of the heat exchanger creates a turbulent airflow, reducing the boundary layer and improving heat transfer


Turbulent air passing though the heat exchanger removes particles, keeping it clean and reducing the need for maintenance




Innovative Heat Exchanger

Performance Data Buoyancy Driven Flow Ventive PVHR has been tested in various installation and operation scenarios including both airtight and standard homes as well as with opened or closed windows (as seen on the graph on the right). Without wind assistance the air exchange rate reaches approximately 1 per hour when the temperature difference between inside and outside is above 10째C.

Annual Ventilation Rates Ventive delivers the optimal amount of fresh air across the seasons; the graph below demonstrates the average annual performance of a typical Ventive installation charted against the requirements of Building Regulations (AD-F). The higher the number of Ventive systems installed in the house, the higher the overall ventilation rate. Smaller homes will require fewer systems to achieve good indoor air quality.

Heat Recovery

Ventive reduces fuel bills by recovering most of the heat energy from the outgoing air. Tests conducted by Imperial College London have shown that heat recovery efficiency is as high as 95% with the system saving over 80% of energy even at high ventilation rates. This typically translates into 4,000kWh of heating savings per year, which in practice means fresh, healthy and comfortable homes with much reduced fuel bills (providing on average ÂŁ200 heating and up to ÂŁ100 electricity savings per year).

Summer Cooling Ventive not only helps you stay warmer in winter, it helps you stay cooler in the summer too. Studies and tests have shown that Ventive PVHR will help to cool homes in the evening after a hot day, maintaining a healthy environment and improving your comfort.

Ventive Brochure  
Ventive Brochure  

Passive Ventilation with Heat Recover7 (PVHR) -Meet the next generation airflow system