The last service date of the forced air heating/cooling system appeared to be more than 1 year ago, or the inspector was unable to determine the last service date. Ask the property owner when it was last serviced. If unable to determine the last service date, or if this system was serviced more than 1 year ago, recommend that a qualified HVAC contractor service this system and make repairs if necessary. Because this system has a compressor and refrigerant system, this servicing should be performed annually in the future. Any needed repairs noted in this report should be brought to the attention of the contractor when it's serviced.
Air filters for the heating and/or cooling system were missing at one or more locations where they should have been installed. Indoor air quality will be reduced as a result. Recommend installing good quality filters at intended locations (e.g. in or at the air handler, behind return air grills). Filters should be sized correctly to minimize air gaps. Many types of filters are available. Recommend installing pleated filters or better rather than the cheapest disposable kind. For more information, visit:http://www.reporthost.com/?FLTRTPS
A passive system is typically installed at the time the house was constructed and has two elements:
(1) a vent pipe extending from the sub-slab gravel up to above the roof or eave
(2) a physical barrier (polyethylene membrane) between the soil and house foundation.
In summary, the main difference between passive and active radon mitigation systems is that the passive system relies on natural pressure differentials and air currents instead of a fan (used with active radon mitigation systems) to draw radon up from below the home.
Per the Environmental Protection Agency, “Passive subslab suction is generally not as effective in reducing high radon levels as active subslab suction.” These systems will reduce radon levels but may not reduce the levels below the 4.0 pCi/L action level. Because of this, we recommend testing the home for radon gas. If the test result is 4.0 pCi/L or above, a qualified radon mitigation contractor can easily add a vent fan to an existing passive system to further reduce the radon level in the home
One ceiling fan appeared to be inoperable, or the inspector was unable to find normal controls with which to operate the fan(s). Recommend asking the property owner about their operation, and if necessary, that a qualified electrician evaluate and repair.