Envirofan offers sub-floor ventilation with positive cross flow ventilation whereby air flows from a supply point to an extraction point. Envirofan sub-floor ventilation systems eliminate the usual problems that rise from sub-floor ventilation as they do not require ducting in 98% of cases. According to Envirofan, sub-floor ventilation should move freely and uninhibited throughout the sub-floor area.
Cross flow ventilation in sub-floor ventilation situations is a more sensitive issue with in-line ventilation fan systems and ducting because if the in-line sub-floor ventilation system has inadequate supply air this can cause the in-line sub-floor ventilation system to overheat and can cause the fan ventilation system to burn out prematurely. Supply air can also starve an in-line fan sub-floor ventilation system when the supply duct is too long or too small.
When the focus is on a sub-floor ventilation project, to gain the best possible positive cross flow ventilation outcome, ensure that the supply air or induce air via the sub-floor ventilation system is from the drier aspects of the dwelling. This must be a northern or western aspect and the extracted air via the sub-floor ventilation system is to the southern or eastern side of the dwelling.
The sub-floor ventilation has to be done right the first time for the reason that if the client or the sub-floor ventilation company doesn’t get it right, things would have to be undone, which may possibly incur unnecessary time & expense to the customer.
Most remedial work done by Envirofan in sub-floor ventilation is because the building has raked out purps and terracotta vents. A passive vent is only as good as the wind blowing through it. This is not a problem if the client lives on a hill in the country with a constant breeze aerating your sub-floor area. In the city sub-floor ventilation is inhibited by other structures, boundary fences and raised ground levels by landscaping.
This can cause a swathe of problems such as entrapped humidity in the sub-floor area which can encourage termites, dry rot in timber flooring structures, an a unhealthy environment inside the home that can cause respiratory problems to the occupants. Sub-floor ventilation should not be minimized in view of the foregoing information.