LoginThe study compares on 30 ventilation systems an hygienic factor determined from conditions at air intake (including moisture before and after drainage, porosity and contamination) and microbiological analysis of air.
Bibliographic database Airbase
AIRBASE is the Bibliographic Database of the AIVC. It contains publications and abstracts of articles related to energy efficient ventilation. Where possible, sufficient detail is supplied in the bibliographic details for users to trace and order the material via their own libraries. Topics include: ventilation strategies, design and retrofit methods, calculation techniques, standards and regulations, measurement methods, indoor air quality and energy implications etc. Entries are based on articles and reports published in journals, internal publications and research reports, produced both by university departments and by building research institutions throughout the world. AIRBASE has grown and evolved over many years (1979 to present day, over 22000 references and 16000 documents available online). For most of the references, the full document is also available online.
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The study examined emissions from dust collected on 2 stages ventilation filters in winter in Helsinki or in its outskirts. The filters contained a lot of fresh particles due to traffic, combustion, and power production.
This paper studies the overall accuracy and comparability of both trained and untrained panels in order to determine the required size of the untrained panel, and to determine the limit value (mean vote) corresponding to an acceptable air quality.
To minimise emissions from ducts, it is necessary to manufacture with low emission lubricants or with lubricants that leave only minor amount of residues on the surface.
On 75 air outlets of HVAC systems from 12 participating companies, fungal contamination was measured and compared to the incoming fresh air.
Resistance of louvers to the penetration of snow is a main parameter in Nordic countries. The study presents an experiment on 10 louvers tested in situ.
Measurements were carried out in a test chamber with displacement ventilation to know the vertical distribution of airborne particles generated by two human subjects having an activity representative of that of people working in an office.
Two models were applied to predict particle deposition in ducts, one theoretical, the other based on experiments. These models are described and a comparison of their predictions is compared to experimental results.
Ways of removing from indoor air particulates smaller in diameter than 1 micrometer, through enhancement of particle deposition in a filter, were investigated using numerical simulation.
A new version of 'classification for indoor climate, construction and building material' has been published in 2001 in Finland, giving recommendation on ventilation systems and their cleanliness.
Labelling of HVAC systems is a direct consequence of the publication of test procedures and recommended criteria in Finland. Cleanliness parameters are dust quantity, oil residues and odours emissions.
Visual inspection is a subjective method but yet necessary to control duct cleanliness. In order to improve its reliability, a visual scale has been realised and results from a panel of 10 inspectors have been compared to measurements.
Maintenance is often limited to repair and failure response and not dedicated to indoor environment.
The effect of duct cleaning has been checked on 15 buildings. Indoor air quality measurements and questionnaires have been operated 3 months before cleaning and 1 month after.
The demand for duct cleaning has been increasing exponentially over the last few years and to determine objectively if the duct is dirty and has to be cleaned is necessary.All air-handling units from a school district (18 buildings) and representa
The aim of this study was to evaluate the amount of dust in supply air ducts in 18 recently installed ventilation systems constructed according to two different class of cleanliness.
In the context of the definition of new national ventilation cleanliness classes in Finland, it is important to develop a clean method for the installation of ducts.
The paper presents hygiene requirements to be met by hospital HVAC plants and analyses them critically for different type of rooms (confined rooms sterile protected, operating room, special areas).
This new standard goes much further than previous one in addressing pre-cleaning assessments, control and containment during the cleaning process as well as a lot of other variables that can impact the indoor environment.
The study has monitored two office buildings during 3 years changing position of dampers in order to control the air change in the buildings on periods of 3 months. CO2 levels, absenteism rate and rhinovirus in air samples are commented.