Sub Floor Vents Spacing

A minimum of five air changes per hour should be provided and double that for wet subfloor spaces.

Sub floor vents spacing.

Landscaping should not limit air flow around the external perimeter of the sub floor space and structural elements should not limit air flow. The general australian standard requirement for the spacing of air vents is that they should be placed within 600 mm of corners and be spaced evenly around the perimeter walls of the building. Their size and spacing depends on the design of the vent and the amount of air it allows through. Vent type l vent size l area per square mm.

3600 specifies that the minimum requirement for sub floor ventilation should be one 1 ventilator of 8 400 mm. Aleta 230mm x. Obstacles that prevent air flow to and from vents will reduce the efficiency of the sub floor ventilation system. Terracotta 230mm x 150mm 6 200vent in situ.

A clear opening area of 3500 mm 2 100 x 35 mm should be provided for every square metre of floor area. 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. The sub floor space must be free from all building debris and vegetation. Of the australian standards a s.

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. Ventilate the underfloor space by providing ventilation in two opposing external walls. Openings should be provided within 750 mm of corners and evenly spread.