Hi all, my workplace mandates use of respirators for some tasks, for which we had to be face-fit tested, and whilst I have a perfectly serviceable Sundstrom SR100 half-face mask I don't always have the requisite clean-shaven mush for it to seal to. They've bought others the SR500 full-face powered resp. with safety helmet but as I've a big bonce (crash helmet 62-63) it's painfully too small because of all of the air ducting and crap mounted inside the helmet shell. Looking online the 3M Versaflo looks a good best, but does anyone who has or uses one have a recommendation for a product for the large-skulled amongst us?