Mechanical ventilation and heat recovery - Heat recovery units, ducts, fittings, ventilation accessories

Ducts and fittings made of EPP stand for high strength and very good thermal insulation of the installation. No additional thermal insulation is required. Available in two thickness options, 15 mm and 43 mm.

Problem-free installation!

Buy CE-certified fire and smoke dampers directly from the manufacturer. Fire dampers are available in round and square designs, with fusible links or actuators. Fire resistance class EIS60, EIS90, and EIS120.

Keep it safe!

The universal assembly makes SlimAIR stand out among its competitors. You can mount it horizontally, vertically, or horizontally suspended. Compact dimensions and a height of 24.2 cm reduce installation space.

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Discover 6 ventilation systems tailored to maritime applications. A wide selection of non-insulated and preinsulated ducts and fittings in galvanized steel, aluminium, and stainless steel (10,16, and 25mm insulation) is available.

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Installer show 2024

The Installer Show 2024 took place in Birmingham in the last days of June, where we were pleased to showcase our latest recuperators and the ventilation components we have been known for over the years. It was a great opportunity to work more closely with existing trade partners, as well as learning more about local market trends.

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MCE 2024

MCE 2024 in Milan is one of the most important events of the HVAC industry in Europe. We had the pleasure of presenting at the fair the tried and tested products for industrial and specialised ventilation that we have been known for many years, as well as new products: the SlimAIR 1000 heat recovery unit and the latest, designed for flats, the FlatAIR.

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AHR Expo 2024

At AHR Expo 2024, held January 22-24 in Chicago, we presented HVI-certified recuperative air handling units. The units earned best-in-class scores, which also resulted in Energy Star certification. The recuperators along with the EPP system were very popular with visitors. At our booth you could also see innovative controls and peripherals that allow our units to operate at even the lowest temperatures.

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Uncover practical solutions to common industrial ventilation issues with expert guidance. Learn how to tackle inadequate airflow, filtration problems, and equipment failures,…

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The functionality of a ventilation installation is the matter not only of its design and assembly but also of its proper exploitation and maintenance. To ensure the flow of…

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The majority of energy losses in buildings occur in heating, ventilation and air conditioning systems. Recovering waste heat from HVAC systems can therefore make a significant…

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Clogged, dirty filters are the most common cause of HRV failure. The dirtier the filter, the lower the efficiency of air filtration, which means higher power consumption and…

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Frequently asked questions about heat recovery unit

Opening windows when heat recovery systems is in operation is not recommended, as this can upset the balance of airflow provided by the ventilation system. Of course, it is also not forbidden, after all we cannot be slaves in our own home. Mechanical ventilation is designed to efficiently supply fresh air to rooms and to remove stale air on a continuous circulation basis.

Opening windows for long periods of time can slightly disrupt the system, which can result in a reduction in the effectiveness of mechanical ventilation and the introduction of pollutants from outside into the rooms. However, if you need to ventilate the room quickly, you can of course open the window, but remember to close it again later and let the MHVR system return to normal operation.

The frequency of servicing a heat recovery unit depends on several factors, such as the specification of the unit model, the quality of the filters and the environment (place of residence) in which the recuperator operates. In general, it is recommended to service and maintain the recuperator at least once a year. The service usually involves checking filters that may need cleaning or replacing, as well as the accuracy of all components, including fans, heat exchanger, sensors and controls. Taking care to service your mvhr unit regularly can help to maintain its efficiency, performance and extend its life. It is also always a good idea to follow the manufacturer's recommendations for maintaining and servicing your particular recuperator model.

The cost of installing a heat recovery unit (heat recovery system) can vary considerably depending on several factors, such as the size and layout of the building (type and number of rooms), the choice of a particular model of MHVR unit or, finally, the air distribution system (SPIRAL?system, EPP System, FOAM System). Also the quality of the materials used and local market conditions such as labour costs affect the final amount. Basic models of heat recovery unit can start from a few thousand PLN, but advanced heat recovery ventilation, which may include additional features such as additional sensors, Zoning system, can be much more expensive. It is also worth taking into account operating costs, such as electricity consumption, or maintenance and servicing costs of the HRV. Therefore, to get an accurate quote for a heat recovery systems, it is advisable to consult an experienced specialist - Contact us at and we will calculate your fresh air requirements and help you choose the right size of recuperator for your home. You will also receive a quote for a complete HRV system.

Gravity ventilation and mechanical ventilation with heat recovery differ mainly in the way in which air exchange takes place and in the efficiency of heat recovery. Gravity ventilation is based on natural air circulation, where differences in temperature and air density cause air movement. Here, air exchange takes place uncontrolled and is often insufficient to supply an adequate amount of fresh air into the building. There is also no heat recovery here.

Mechanical ventilation with heat recovery, on the other hand, is a more advanced system that not only provides an efficient exchange of air, but also recovers heat from the extracted air using it to heat fresh air from outside, which is then blown into the rooms. With heat recovery, it is possible to maintain an adequate indoor temperature with minimal heat loss, resulting in energy savings.

The main difference between gravity ventilation and heat recovery unit with recuperation is that with heat recovery unit, air exchange is fully controlled and the air supplied to the building is filtered. In addition, thanks to the recuperation system, heat recovery is also possible, which has a positive impact on thermal comfort and energy savings in the building.

The installation of a recuperator usually requires specialist building work. The installation of the heat recovery unit and ductwork network requires precise planning and execution to ensure that the system works properly. It may be necessary to carry out work to drill holes in the walls or ceiling to allow for the installation of expansion boxes or air intake and exhaust ducts.

t is therefore advisable to use an experienced specialist or mechanical ventilation installation company with the necessary qualifications and experience to ensure the correct installation of the recuperation system.

The installation of a heat recovery system, can be quite complicated and requires adequate knowledge and experience. Although it is theoretically possible to attempt to install the heat recovery unit and ductwork network yourself, there is a risk of making a number of mistakes that can negatively affect the heat recovery efficiency (performance) and functionality of the system. In addition, improper installation of the system can lead to ventilation problems such as insufficient air circulation, increased noise or heat loss. A common mistake of self-installing a HRV system is the lack of adequate insulation of the ducts which results in heat loss and the supply of cold air into the rooms.

It is therefore advisable to use a professional installer or a company specialising in the installation of heat recovery unit systems. A professional installer has the knowledge, experience and tools to correctly design and install a recovery unit system, taking into account the specific requirements and conditions of the building in question. In addition, by using a professional, you can be sure that the installation will be carried out in accordance with current standards and regulations and that the system will operate efficiently and smoothly.

The costs associated with installing and maintaining a heat recovery system can vary depending on a number of factors, such as the size and complexity of the system, the location of the building, the type of recuperator, the quality of the materials used for the installation, and the level of service provided by the installation company.It is possible to assume the cost of carrying out a full heat recovery installation to be in the region of ?20,000 - ?40,000.

Installing a recuperation system involves costs associated with the purchase of the heat recovery unit itself (an average of ?8,000 - ?12,000 should be assumed) and the materials and labour required to install the ductwork network. These costs can vary depending on the manufacturer, model and function of the heat unit and the installation specification. In addition, costs may also include design and consultancy services, installation, maintenance and any costs associated with obtaining the necessary permits and certificates.

When it comes to the maintenance of a heat recovery system, costs can include regular inspection and maintenance, filter replacement, repairs, as well as the energy consumption needed to run the recuperator. These costs can vary, depending on the frequency of inspection and maintenance and the energy consumption of the whole system.

The payback time for a heat recovery system can vary depending on a number of factors, such as the type of recuperator, the size and type of building, location, energy costs, frequency of filter replacement or system maintenance. Typically, however, the payback time for a recuperation system can be expected to be between 15 and 18 years.

A key factor in the payback time is the energy savings provided by HRV. By recovering heat from the air used, a recuperation system can significantly reduce the energy consumption needed to heat or cool a building. The higher the energy costs in a given region, the quicker the return on investment can be expected.

Additional factors, such as possible subsidies, tax breaks, as well as possible maintenance and upkeep costs of the system, can also affect the payback time.

It is also worth remembering that recuperation not only helps to save energy and reduce the running costs of a building, but also improves occupant comfort by providing fresh and purified air, which can also have a positive impact on the quality of life and health of the occupants.

Yes, heat recovery unit has a significant impact on a home's energy consumption. By recovering heat from the air removed from the building, a heat recovery system allows you to reduce the energy used for heating. As a result, you can save on your energy bills (it is accepted that recuperation can save up to 60%), which translates into lower running costs for your home. In addition, recuperation helps to maintain a constant indoor temperature, which can further improve occupant comfort and provide healthier living conditions.

Yes, recuperation can be used to cool rooms, while it should be remembered that it is not a replacement for air conditioning due to its much lower airflow. Current recuperators use a so-called by-pass. The operation of the by-pass is based on the flow of air through the air handling unit bypassing the heat exchanger. It is used in summer when the outside temperature is lower than the temperature inside the building. In this case, by bypassing the heat exchanger, we supply the building with fresh, filtered but cool air from outside.

In addition to the by-pass, we can use, for example, a water-based duct cooler/heater to cool down the supply air, which, in cooperation with the heat pump, can support room cooling.

Alnor Ventilation Systems
Krakowska 10 Avenue
05-552 Wola Mrokowska

tel. +48 22 737 40 00