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1. Installation
1.1 General installation instructions
Heat Recovery Ventilator 'Fair' (here in after – HRV) should be installed in a warm premises, with indoor
temperature over +5 °C.Ventilation ducts should be spacious enough so that the velocity of air streams is
sufficiently low. The duct size is to be determined according to the size of the ventilated apartment and the
forecasted air consumption.
National Building Code of Finland (chapter D2) contain regulations and guidelines for indoor climate and
ventilation of buildings, airflow planning and ducts recommendations, and terminal design and placement.
Chapter C2 of the above mentioned National Building Code contains regulations and guidelines for moisture
technical planning. National Building Code of Finland are freely available on the Ministry of Environment
website (http://www.ym.fi/en-US).
Space sufficient to open an HRV door should be taken into account when planning suitable place for HRV
installation. The electric socket should be located near the HRV device to make electricity connection
conveniently available.
1.2 Isolation of ducts
Picture 4:isolation of ducts
Example of different types of insulation:
1. An extract air duct in the warm premises.
2. A supply air duct from HRV to the valve.
3.An exhaust and outdoor air ducts installed indoors (warm space).
4. An extract air duct inside the insulation material of the room's ceiling installed above the vapor barrier
5. and 6. any type of duct installed in the cold space(e.g. in the attic)
Note! Outdoor or exhaust air ducts shall not be installed on the vapor barrier directly, but must be insulated
with not less than 100 mm thick insulation material.
Vaporproof
outer surface
Vaporproof
outer surface
3
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