Så här skriver Finnair angående vilka munskydd som krävs.
@Samet har rätt, ventil får det inte vara. Det verkar också vara okej med en medicinsk mask (surgical mask)
"Please bring your own masks with you. This can be a
surgical mask, a
valveless FFP2 or FFP3 mask or another kind of
valveless mask following the equivalent standards (N95). Please note that we do not accept masks made of fabric, face shields, masks with a valve or scarves used as a mask, as they allow air to escape and do not provide comparable protection."