Confused between an F400 fan and one rated for continuous 250°C operation? They are completely different products. Full technical guide with Casals products available in Romania — with prices and real-world applications.

Air curtain guide 2026: when mandatory, how to choose between electric and hot water types, how to calculate width and air speed. Real prices.

ATEX fans: zones 1/2/21/22, equipment categories, temperature classes, approval documents. Complete guide for designers and engineers.

Linear, stepped or variable frequency drive? Complete guide: differences, when to use each, AC and EC motor compatibility, common mistakes.

How to choose the right bathroom extractor fan: airflow calculation, difference between cheap and premium models, timer vs humidity sensor.

Mould keeps coming back after cleaning? The real cause is poor ventilation, not dirt. Complete guide: where it comes from, how to eliminate it permanently, what equipment prevents it.

I5-2022 vs I5-2010: top changes for designers — IDA air quality, mandatory heat recovery nZEB, filtration matrix, airflow calculation methods.

Heat recovery ventilation for new homes 2026: what is MVHR, why nZEB makes it mandatory, real prices, single-room unit vs. central system. 

Production hall ventilation: industry-specific requirements, ATEX, corrosion-resistant, smoke extraction, airflow calculation. Guide for production managers and engineers.

Logistics hall ventilation: legal obligations, airflow calculation, permitted temperatures, smoke extraction and recommended equipment. Guide for managers and developers.