Vent

Name

Provide a name for this element so that it can be identified later

Type of vent

Trickle

Air brick

Effective ventilation area

The actual area through which air can flow, accounting for obstructions like grilles or mesh

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Vent type	Effective area (cm2)
Small trickle vent	50 - 100
Standard window trickle vent	200 - 500
Wall-mounted air brick	100 - 300

Mid height of zone

Mid height of the zone that the vent serves

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Typical ranges - 1.2 - 1.8m

Pressure difference

The difference in pressure between inside and outside the building, which drives airflow

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1 - 2 Pa for natural ventilation
5 - 10 Pa for mechanical systems

Orientation

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To define an object's orientation, measure the angle of its outside face clockwise from true North, accurate to the nearest degree.

Pitch

Guidance (opens in another window)

Tilt angle of the surface from horizontal, between 0 and 180, where 0 means the external surface is facing up, 90 means the external surface is vertical and 180 means the external surface is facing down

180 = floors
0 = ceilings