DEPRESSURIZATION SYSTEMS MIGHT LOOK A LITTLE DIFFERENT IN THE USA
A Google search of radon mitigation systems will probably yield many results linking to installations completed in the USA. While the concept is the same, there are some differences in the options provided by Canadian guidance documents and those in the USA.
American guidance specifies that the radon fan should be located in uninhabited space (outside or attic). This guidance, while certainly technical sound, was developed to keep potentially leaking fans and piping out of living spaces. Contemporary radon fans are sealed and solvent welded piping is tested for leaks.
Canadian guidance discusses radon fan location inside living spaces. This has the benefit of not subjecting the fan to the outdoor elements and avoiding running system piping through finished spaces to the attic.
American guidance typically requires system discharge to be above the roof line. While this arrangement does provide for radon discharge away from receptors, it can present freezing issues for condensate in the winter.
Canadian guidance indicates that a side vent discharge may be preferable in our climate. This would seem to make sense if we consider how our furnaces and hot water tanks discharge combustion products. If side vent discharge is acceptable for these appliances, it seems logical that the same arrangement would be suitable for radon mitigation system discharge.