Examples from the Web for ventail
It has a tilting helmet with visor in two pieces, and a shutter in the ventail; the leg-armour is still complete.Spanish Arms and Armour|Albert F. Calvert
The ventail bris dates from the period of the first introduction of the folded fan into Europe.History of the Fan|George Woolliscroft Rhead
I fail to see why; the weapon that pierced a ventail would pass into the head, and inflict a death-wound.Chaucer's Works, Volume 5 (of 7) -- Notes to the Canterbury Tales|Geoffrey Chaucer
The other drags him by the helmet, tearing all the fastening, and he strikes from his head the ventail and the gleaming coif.
She puts on his hauberk with its strong meshes, and laces on his ventail.