(1) Combustible window sashes and frames are permitted in a building or part of a building permitted to be of encapsulated mass timber construction, provided,
(a) each window in an exterior wall face is an individual unit separated from every other opening in the wall by noncombustible wall construction or mass timber wall construction conforming to the dimensions stated in Table 3.1.6.3.,
(b) windows in exterior walls in contiguous storeys are separated by not less than 1 m of noncombustible wall construction or mass timber wall construction conforming to the dimensions stated in Table 3.1.6.3., and
(c) the aggregate area of openings in an exterior wall face of a fire compartment is not more than 40% of the area of the wall face.