Abstract: An apparatus and method for preparing saline solution and using the saline solution for rinsing nasal passages. The apparatus includes a container (10) having sidewalls and opening for a removable cap (13). The cap has an external tapering hollow nozzle (14). The nozzle (14) is inserted into one end of a flexible tube (21). The other end of the tube (21) is inserted into a hollow removable contoured dispenser tip (23) which is shaped to fit a human nostril comfortably. A thin tubular conduit (19) is attached to the cap by means of a fitting (16) and the conduit extends into the container (10) close to its bottom when the apparatus is fully assembled. A saline solution is prepared by adding iodine free common salt to warm distilled or boiled water in the container. After attaching the cap (13) to the container (10) and inserting the dispenser tip (23) into one nostril, a user bends forward and tilts the head to the side of the other nostril and breaths through open mouth.

Abstract: A combustion air heating system includes both an air heater for preheating the combustion air by heat exchange with flue gases and an air preheater for preheating the combustion air prior to entry into the air heater. The air preheater operates by heat exchange between the combustion air discharge from the air heater and a bypass stream of combustion air located upstream of the air preheater. The amount of combustion air flowing through the bypass duct is controlled so that the temperature in the air heater does not fall below the dew point of the acid gases present in the flue gas.