Compliance with Building Codes
The 2010 Edition of the U.K Building Regulations
Approved Document F- F1: Means of Ventilation
(applicable in England and Wales) details 4 clearly
defined systems of ventilation to dwellings. System 3 -
Continuous mechanical extract (MEV) is complied with by
the VORT LETO MEV HCS ultra-high efficiency whole
house extract ventilation system.
System 3- Continuous mechanical extract requires a
"minimum high rate" in each wet room to be achieved
(Kitchens 13 l/s and both utilities and bathrooms 8 l/s -
sanitary only 6 l/s).
The system provides quiet, uninterrupted extract
ventilation from the dwelling via all the wet rooms,
creating a permanent air path through the property from
the “dry” habitable rooms to the “wet” rooms.
The current Building (Scotland) Regulations refers to
continuously operating mechanical extract ventilation in
accordance with the guidance in BRE (Building Research
Establishment) Digest 398, a paper based on the former
government department’s (and now private company)
own tests and recommendations , specifically 0.5 air
changes per hour throughout the property.
The VORT LETO MEV HCS complies fully with the
recommendations contained within this document.
In Ireland, Technical Guidance Document (TGD) 2008
Part F: Ventilation is applicable and the Vort Leto MEV
HCS complies fully with the recommendations contained
within this document.
The ‘Code for Sustainable Homes’ which came into force
in March 2007, details six levels of CO2 emission
improvement over 2006 Building Regulations
requirements.
To achieve the three highest levels of reduction of carbon
emissions, the air leakage of the dwelling must be
improved so significantly that continuous ventilation
becomes the only appropriate method. In addition, it must
be demonstrated that the ventilation system itself
must be energy efficient. The VORT LETO MEV HCS has
been independently tested by the Building Research
Establishment (BRE) to the appropriate SAP (1)
Appendix Q test methodology and is therefore Appendix
Q eligible.
(1) The Governments Standard Assessment Procedure
(SAP) is a method assessing the energy performance
of dwellings and SAP Appendix Q provides an
allowance for the benefits of energy-saving appliances;
products may be independently assessed and the
results uploaded to the SAP website.
Description
Comfort and energy efficiency are becoming
increasingly important factors in buildings. With this in
mind, appliances are being developed to control the
micro-climate within homes and to provide a high
degree of comfort along with energy efficiency. These
appliances quietly and continuously ventilate homes
removing humidity from service areas (bathrooms,
kitchens, etc.) and creating a flow of “dry” air in “lived-
in” areas (dining areas, studies, bedrooms, etc.). The
Vort Leto Mev HCS range of centralised ventilation
systems has been specifically designed for continuous
ventilation in domestic applications, but may also be
used in some commercial applications is fitted with
brushless three-phase motors with electronically
controlled three-speed operation:
The VORT LETO MEV HCS is a modular appliance
that means maintaining and replacing parts is both
quick and easy.
The appliance can be wall or ceiling mounted. The unit
presents 5 vents: the one positioned at the top right (fig
1) is for expelling stale air; the other 4 (fig. 2) extract
humidity and stale air from the dwelling.
ENGLISH
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