Sub Floor Vents Spacing

Squared nett ventilation per lineal metre on both external and internal walls.

Sub floor vents spacing.

Table 3 4 1 1 specifies the minimum amount of subfloor ventilation openings and height of subfloor framing members above ground level for the three climatic zones illustrated in open link in same page figure 3 4 1. Vent type l vent size l area per square mm. The table allows subfloor ventilation rates to be halved if the ground within the subfloor space is sealed by an impervious. The space under a suspended timber framed floor must be ventilated.

Aleta 230mm x. 3600 specifies that the minimum requirement for sub floor ventilation should be one 1 ventilator of 8 400 mm. Ensure ventilation has a free and unobstructed path to all areas by making provision for ventilation air to pass through sleeper walls and other sub floor obstructions. Obstacles that prevent air flow to and from vents will reduce the efficiency of the sub floor ventilation system.

A minimum of five air changes per hour should be provided and double that for wet subfloor spaces. A clear opening area of 3500 mm 2 100 x 35 mm should be provided for every square metre of floor area. The sub floor space must be free from all building debris and vegetation. Their size and spacing depends on the design of the vent and the amount of air it allows through.

Terracotta 230mm x 150mm 6 200vent in situ. Of the australian standards a s. Openings should be provided within 750 mm of corners and evenly spread.