Warning: get some mesh and stick it over/under the front facing holes

I've just had the unpleasant experiance of scooping a Bee up in the mid centre hole, which could not escape due to the air pressure. First thing I knew of it was a large sharp pain in the top of my head!!!! as it stung me

 Wondered why my Wife's Giro had mesh at the front now I know. Painful lesson learnt