The boiler includes a source of fuel, a source of air, and a controller for controlling the ratio of the source of air and the source of fuel inputted into the boiler.

A compressor provides a source of compressed air.

A source of air having a primary fan is provided.

The pneumatic duct is configured to deliver an air stream from the source of air into the recycle manifold.

The pressurized air manifold is supplied with pressurized air from a source of pressurized air.

The base body is provided upstream of the nozzle with at least one sealing washer and is connected to a compressed air source.

The inert gas generating system includes a compressed air source, a cooling air source, and a separation module.

The neck member includes an air inlet to receive cooled air from an air source.

An air inlet (1 14) is provided for receiving air from a source of pressurized air.

The inlet end is connected to a source of pressurized air.

The tubes (11) are connectable to a source of pressurised air via air lines (30).

An air channel (384) connected to a supply of pressurized air is connected to the pintail bore.

Disclosed is a variable air source that provides directional control over a low-pressure airflow.

In at least some embodiments, an apparatus includes a pressurized air source and a tube coupled to the pressurized air source.

An air stream is directed to flow from an ambient air inlet to an air outlet constantly so that there is always a fresh source of cooling air.