Condensation on a cold duct can damage insulation, stain ceilings and shorten the life of the installation. VENTIT's new free calculator shows the risk immediately and helps you compare practical solutions before installation.
Watch the calculator in action
The walkthrough uses a real example to show how a change in room humidity or insulation thickness affects the result.
From input values to a clear result
Enter the medium temperature, room temperature and humidity, the duct or pipe dimensions, insulation material and thickness. The result updates as you type and shows:
- whether surface condensation can occur
- the surface temperature and dew point margin
- the minimum and recommended insulation thickness
- how the transported air warms up or cools down along the run
Two ways to solve the same problem
A low safety margin does not always mean that thicker insulation is the only answer. The calculator lets you compare a larger insulation thickness with a lower room humidity. That matters when space is limited or a larger outside duct diameter would make installation more difficult.
Useful for real HVAC decisions
Ready-made operating presets make it easy to test common situations, while advanced inputs remain available for designers and installers. The model follows EN ISO 12241 and supports conventional metal ducts as well as self-supporting EPP ducting.
Try the free dew point calculator
The result is a design aid. For a binding design, use the thermal conductivity and vapour resistance values from the technical data sheet of the selected product and the applicable standards.