720341Passive Ventilation for New Build MarketClosedGRD Development of PrototypeInnovate UKAs new buildings are built to higher energy standards in line with increasing level of Code for Sustainable Homes, they become more airtight, and natural means of ventilation disappear. To overcome this, Mechanical Ventilation is used, but without Heat Recovery, this leads to up to 5,000 kWh of heat lost from a typical home per year. In order to ‘reclaim’ this energy, Heat Recovery is added. Typically with two fans running, 24h a day, these systems use up to 900kWh of electricity per year (three times more than a new fridge). In cases where gas heating is used, Mechanical Heat Recovery Ventilation provides very little or no net CO2 saving. Besides the energy use, mechanical systems have high installation costs due to their complexity, require a number of trades to install and maintain, and suffer from component failures adding to the running costs which already average £100 per year. Mechanical systems also depend on a number of electronic and mechanical components contributing to lack of reliability, resource depletion and electronic waste. Starting off with our innovative and retrofit specific Passive Ventilation with Heat Recovery that fits through the chimney of an existing dwelling (initially developed with the help of TSB funded feasibility study) and Proof of Concept prototypes now tested and installed in trials, we have designed a reliable ventilation system for mew dwellings which incorporates a number of inventions from our initial product (Ventive S) as well as innovative flow splitter and twin flow diffuser for simplified installation. The proposed system (Ventive S+) both overcomes a number of challenges of wet room installations and makes the product applicable to new built market. The development of this technology will also allow us to provide a Code for Sustainable Homes level 5 ready, full house ventilation system, a proposition preferred by both the BRE and LABC.