Indoor Air Quality & Ventilation
A technical reference on mechanical ventilation, heat recovery, air filtration, and the Czech and EU standards that govern indoor air quality in homes and commercial properties.
Editorial
Detailed coverage of ventilation technology, heat recovery performance, and filtration requirements relevant to buildings across the Czech Republic.
An overview of supply-only, exhaust-only, and balanced mechanical ventilation systems — how each type works and what Czech norms require.
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How counterflow and rotary heat exchangers compare in terms of heat recovery efficiency, frost protection, and suitability for Czech winter conditions.
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Filter classes under EN ISO 16890, PM2.5 limits, CO₂ thresholds, and the Czech technical standards that define acceptable indoor air quality.
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Overview
Czech buildings face long heating seasons with outdoor temperatures frequently below −10°C. Without properly designed mechanical ventilation, airtight constructions required by current energy regulations accumulate CO₂, moisture, and volatile organic compounds faster than in milder climates.
Heat recovery ventilation resolves this by exchanging stale indoor air with fresh outdoor air while transferring up to 90% of the thermal energy — reducing heating loads while maintaining acceptable CO₂ levels and relative humidity year-round.
Efficiency Guide
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