High polished stainless steel (AISI 316) ventilators.
These mushroom ventilators can be opened from the outside or inside using an integral knob.
They include a mosquito screen and synthetic counterflange.
DARTAGN1 FREE FLOW AREA cm2: 76
ATHOS1 FREE FLOW AREA cm2: 45
PORTOS1 FREE FLOW AREA cm2: 30