Airbag with vents having different venting characteristics

An airbag, comprising:

• a panel defining an inflation chamber;
• and
• a first cluster of vents and a second cluster of vents;
• the first cluster of vents including a first vent including a first vent opening extending through the panel to the inflation chamber and a first vent cover covering the first vent opening;
• the first cluster of vents including a second vent including a second vent opening extending through the panel to the inflation chamber and a second vent cover covering the second vent opening;
• the second cluster of vents including a third vent including a third vent opening extending through the panel to the inflation chamber and a third vent cover covering the third vent opening;
• the second cluster of vents including a fourth vent including a fourth vent opening extending through the panel to the inflation chamber and a fourth vent cover covering the fourth vent opening;
• the first vent cover and the third vent cover having a first rupture strength, and the second vent cover and the third vent cover having a second rupture strength higher than the first rupture strength;
• each vent including a membrane, a first ring on one side of the membrane, and a second ring on another side of the membrane;
• and
• for each vent, the first ring being fixed directly to the panel and the membrane being suspended across the respective vent opening by the first ring.