A radiant barrier rafter vent defining an elongate radiant heat reflective panel formed from a sheet of aluminum or other heat reflective material having longitudinal creases that permit compressing the panel a selected amount in a direction transverse to its length and panel strengthening spaced apart formations on the remainder of the panel. The panel have a high reflectivity and are installable in various buildings between the rafters or roof supports spaced apart from the roof and optionally coated with a sound absorbing material or include small perforations therein.