HF-303 half mask, formerly AVIVA 40, size L.Delivery without filter, 1 unit(s)HF 303 half mask, formerly AVIVA 40, size L. Delivery without filter, standard thread acc. to EN 148 1 Acc. to EN 140. Single filter half masks, can be combined with respiratory filters with standard thread acc. to EN 148 1, with a weight of <300 g. Skin friendly thermoplastic elastomer. Perfect fit due to flexible inner Hybrid Reflex Seal User friendly leak test function Easily combinable with eye protection and other PPE Downwards facing respiratory