Guide to wholehouse ventilation

What is MVHR? MVHR (mechanical ventilation with heat recovery) is  a whole dwelling ventilation system that supplies and extracts air continuously at a low rate with the facility to be boosted as required meeting Building Regulations Part F System 4.The unit is normally installed in the loft space or cupboard and rigid ducting supplies fresh filtered air to the habitable rooms and extracts stale polluted air from the ‘wet’ rooms. Supply and extract diffusers are fitted to the ceilings and are adjusted to balance the system. Fresh Incoming AirWarm Incoming Air Extract Air from the Home Stale Air to Outside The unit incorporates a heat exchanger (see diagram below) that tempers the incoming air before it is delivered to the habitable rooms. The efficiency of the exchanger can vary from 70% to 95% heat recovery depending on whether it is of cross-flow or counter flow type, counter flow being the most efficient. Building Regulations are now calling for increased thermal efficiencies therefore the 95% heat exchanger is the best option.  The system can be controlled to boost speed when moisture is being generated by bathing or cooking either;•  Manually via single or multiple switches•  Automatically, typically via humidity or  other sensors Manual switches should be located in or near the wet rooms. Background ventilators in windows are not required with this system. What is MEV? Centralised mechanical extract ventilation (MEV) follows the same principle as MVHR except it does not include any heat recovery. A central unit is mounted in a loft or cupboard and ducted to extract polluted air from the wet rooms of the house. As there is no heat recovery, there is no requirement for any ducts to supply the replacement air. Instead, replacement air enters the home through window vents or airbricks. In many houses however, air naturally enters the building through gaps and cracks in the structure, providing adequate ventilation. Fresh Incoming Air Extract Air from the Home Stale Air to Outside The removal of pollutants, such as moisture, carbon dioxide and external fumes are all important factors in maintaining good indoor air quality, helping to create a better living environment. Some MEV units will include a humidity sensor, designed to increase the fan speed in proportion to relative humidity levels, saving energy and reducing noise. Guide to Whole House Ventilation 2  T:   0844 856 0590 Fresh Incoming AirWarm Incoming Air Extract Air from the Home Stale Air to Outside

Guide to Whole House Ventilation W: www.vent-axia.com/heat-recovery 3 Lo-Carbon Astra - Up to a 3 Bedroom house or flat •  Entry level MVHR unit Building Regulation  compliant •  Up to 90% efficient and Lo-Carbon high  efficiency motors •  Ideal for wall or horizontal mounting•  Comes complete with condensation drain kit,  filters, mounting brackets and remote wired controller Vertical mount: Stock Ref:  442919 Horizontal mount:Stock Ref:  445048 Lo-Carbon Sentinel Kinetic - Up to a 4 Bedroom house or flat •  Up to 91% efficient and Lo-Carbon high  efficiency motors •  Comes complete with condensation drain kit,  easy access filters, mounting brackets and integral commissioning controller •  Plug and play sensors and remote control  available •  Top or sideways facing 125mm diameter  adjustable spigots •  Summer bypass for comfort cooling in the  summer Stock Ref:  438222 Lo-Carbon Sentinel Kinetic Plus - Up to a 7 Bedroom house, flat or commercial building •  Functional specification as the Sentinel Kinetic  unit above •  Increased capacity for larger houses 150mm  spigots for larger airflows Stock Ref:  443028 Multivent - Up to a 4 Bedroom house or flat •  Adjustable spigots (100 or 125mm diameter)•  Long life AC motor•  Wall, ceiling or loft mountable•  Fully adjustable trickle and boost speed Stock Ref:  181510 Lo-Carbon Multivent MVDC-MS - Up to a 7 Bedroom house or flat •  Adjustable spigots (100 or 125mm diameter)•  Boost via a switched live• High  efficiency  Lo-Carbon  motor •  Wall, ceiling or loft mountable•  Fully adjustable trickle and boost speed Stock Ref:  437634 Lo-Carbon Sentinel Multivent - Up to a 7 Bedroom house, flat or commercial building •  Functional specification as the Lo-Carbon  Multivent unit above •  Increased controllability for even greater  energy savings Stock Ref:  437601 Rigid Ducting Regardless of the size or shape of your project, we will be able to advise you on all of the ducting and fittings required to optimise your ventilation system.•  Full range of round and flat ducting with bends, connectors and ancillaries•  204 x 60 and 110 x 50 ideal for installation in ceiling voids•  Made from recycled plastic MVHR Systems MEV Systems

VENT-AXIA CONTACT NUMBERS Free technical, installation  and  sales advice is available Sales Centre: Domestic & Commercial     Sales Tel:  0844 856 0590   Sales Fax:  01293 565169   Tech Support Tel:  0844 856 0594   Tech Support Fax:   01293 539209 Industrial   Sales Tel:  0844 856 0591   Sales Fax:   01293 534898   Tech Support Tel:  0844 856 0595   Tech Support Fax:  01293 455197   Web: www.vent-axia.com   Email:  [email protected] Supply & Service All sales made by Vent-Axia Limited are made only upon  the terms of the Company’s Conditions of Sale, a copy of  which may be obtained on request. As part of the policy of  continuous product improvement Vent-Axia reserves the right  to alter specifications without notice. By Appointment to H.M. The Queen Suppliers of Unit Ventilation Equipment Vent-Axia, Crawley, West Sussex Vent-Axia Group Ltd Products you can trust A British company supporting British manufacturing 0913