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FAQs • Why not simply open windows or install an
extractor fan? • Why not simply open windows or install an extractor fan? Open windows pose a security risk and enable dust, pollen and noise to invade the home. Also it depends on too many variables, the wind, location of the house and the difference in the temperature between inside and outside (stack effect), all of which can create uncomfortable draughts. Extractor fans are inefficient, unsightly and, as with open windows, create draughts. They are also prone to stall if there is insufficient replacement air. For many people, the main objection is the excessive noise they generate, particularly in bathrooms. Both options promote an uncontrollable waste of energy, as heat is simply allowed to escape to atmosphere. • How does Heat Recovery Ventilation work? Stale, humid, polluted air is continuously extracted and replaced by fresh filtered air from outside - 24 hours a day. At the same time, heat is recovered from the stale air and transferred to the fresh air. On average 90% is recycled but this can be higher. It is dependent on which type of heat exchanger is used, together with the difference between the temperature of the incoming and outgoing air, as well as the amount of moisture in the air. For example, if the outside air temperature is 0ºC and the internal air temperature is 20ºC, you can expect the fresh air being introduced via the system to be approximately 17-18ºC. For ventilation systems without heat recovery, the incoming air would be 0ºC. • Does the same air get recycled as well? No, the design of the heat exchanger ensures that the outgoing air and the incoming air are separated so that no cross-contamination takes place. No, all the components are specially designed so that the system operates at a whisper quiet level. No, fresh air is introduced via the system. • Do we still need to fit extractor fans in the wet rooms? No. • Does it comply with Building Regulations? Yes - we design to comply with Part F1 2006 for England and Wales, and • Can this replace the heating system? The ventilation works together with a heating system so that the fresh air is warmed, ensuring there is no discernable drop in temperature. It is compatible with all underfloor heating systems and standard wet heating systems with radiators. No, the airflows are balanced so that air movement is imperceptible. Careful consideration is given to the design of each system so that the room terminals used for either extract or supply air will not create draughts. • Why is the system so effective at dealing with condensation? The air from each of the wet rooms (where most of the moisture is produced) i.e. kitchen, bathroom, en-suite bathrooms etc., is continually extracted and replaced simultaneously by a constant source of fresh, drier, warm air. This continuous cycle is designed to reduce the relative humidity and the risks of condensation and of mould growth occurring. • How is pollution in the home controlled? Harmful gases and dangerous pollutants are removed along with the stale air which is extracted, whilst the introduction of fresh air dilutes any internal contaminants. An individual air change schedule will be prepared in line with the requirements of each job. • How does it help asthma sufferers? Research carried out by a number of worldwide leading authorities have established a clear link between the house dust mite allergen and the development of asthma - 80% of sufferers are allergic to it. Heat recovery ventilation reduces the relative humidity to a level at which the house dust mite cannot survive, thereby removing a major trigger of asthma attacks. For more detailed information please contact us. A pollen filter can be fitted easily which stops 85% of pollen and other similarly sized particles. It is recommended that this is inspected every 3 months, in most cases the inexpensive filter medium can be changed where necessary. This is achieved simply and quickly and does not involve any specialist tools. • How much does it cost to run? By using long-life, low energy DC motors, on average a typical system (for a 4-5 bedroom property) uses about 70 watts of electricity, similar to a normal light bulb. Of course, in most cases, this is more than offset against the savings achieved by recovering the heat from the stale air extracted. • Can we add heating / cooling? Yes, either or both can be added although control methods are usually determined on an individual basis. We are happy to work with suppliers of related equipment to determine the most appropriate solution. Please contact ADM Systems for specific information. • Where in the house is the system installed? The heat exchange unit and most of the associated ducting is usually fitted in the loft or suitable voids (roof apex or eaves) with the air being distributed by neat ceiling-mounted terminals. Where there are two or more floors, ducting drops between floors can usually be concealed in cupboards, wardrobes, internal stud walls, etc. For a specific proposal complete with design, please send us a set of plans or alternatively contact us so we can arrange to visit the site. This depends on the heat recovery unit being used, though usually they are 125mm diameter. However, where space is limited, 204 x 60mm rectangular duct can be used. For guidance please contact us on our technical help line. • Can it be fitted into an existing house? Yes, in order to establish the most appropriate system, we would recommend that we carry out a survey. We can then put forward a fully-costed proposal. Contact ADM Systems and we will phone you... or call us now on 01756 701051. Anyone with competent DIY skills - comprehensive instructions are given and we offer technical back up, if required. Alternatively, ADM can undertake the whole installation on your behalf. We recommend that the system be fully serviced once a year. A simple to follow step-by-step guide is provided. Alternatively, ADM offer an annual maintenance contract. Contact ADM Systems and we will phone you... or call us now on 01756 701051. The system will discourage the build up of heat inside the building by changing the air continuously, creating a fresher, cooler internal environment. At night when the outside temperature is lower you will benefit from a supply of controlled cool fresh air being introduced without the need to open windows, with the resultant problems of noise, compromised security, and the ingress of pollutants. A simple bypass can be fitted so that the outgoing air does not heat up the fresh air. A number of units have thermostatically-controlled automatic bypasses built-in By adding complementary air-conditioning solutions or making use of cooling from heat-pumps, additional cooling can be achieved.
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