Air Vent Size Calculator

An air vent allows fresh air for combustion into the room in which the boiler is situated, and should not be located where it would become blocked or flooded.

To calculate the diameter of air vent required for a certain power of boiler, enter a value into the box for power of either oil or gas boiler below and then click the Calculate button or press the Return or Tab key. The area and diameter of the air vent will then be shown below.