Wartsila Airguard 1000mm

The Wärtsilä Airguard 1000 mm is an air‑seal shaft sealing system for large propulsion shafts (up to 1000 mm diameter) that uses a thin film of pressurised air to prevent water ingress while delivering very low friction. The supplied category identifies it as Shaft Seal, and it is normally installed at the inboard or outboard end of the stern tube around the propulsion shaft where the shaft passes between the hull and surrounding water or lubricating-oil system. In that role, its primary purpose is to control seawater ingress and lubricating-oil leakage while allowing the shaft to rotate. Lip, face and other stern-tube seal designs use different sealing elements, but all depend on smooth shaft or liner surfaces, correct lubrication and undamaged sealing rings. Within the supplied list, neighbouring variants are distinguished by their model designations and naming, while the source does not state further model-specific hardware differences. No additional performance, approval or construction detail is inferred from the model code beyond the information supplied in the source record. For exact ratings, dimensions, settings, capacities, materials and variant-specific limits, refer to the manufacturer documentation for the exact figure.