I'm still an evangelist for the fan trick... one fan took my smoke dragon from heating a side room to the whole house. Probably easier to add an outlet in the upstairs hall to power the fan than to ^&$# with the dubiously-safe vents in the floor.
If you switch to a ceiling fan just make sure that the light box is meant to carry the weight of one or upgraded accordingly.velvetfoot said:I'm leary of willy-nilly cutting holes too.
A ceiling fan in place of an existing light at the top of the stairs might be a relatively painless experiment, although of course, the smoke detectors would be in its sphere of influence, which is probably a no-no. Wouldn't run the fan constantly though.