Blog

Guides and articles for HVAC designers: air curtains, heat recovery and building automation.

1. 27/09/2026Heat recovery

   Why run-around coil heat recovery falls short of its design efficiency

   Run-around coil heat recovery often falls short of its design efficiency in operation. The causes, the test results of the Belok study (2026) and four steps for existing systems.

2. 14/08/2026Air curtains

   How to size an air curtain correctly

   Air curtain sizing starts from the doorway's heat loss. A guide for HVAC designers: the calculation, an example in design conditions, safety factors and air jet quality.