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GB414034A
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Improvements in or relating to air heaters
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ES119684A1
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Perfeccionamientos referring to tubes with flutes or channels for economizers and other similar heat transmitters.
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DE554261C
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Air heater
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DE553735C
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Exhaust air heater for steam boiler
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DE530636C
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Device to limit the draft resistance of the air in air heaters in the event of overload
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DE519471C
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Air heater with return of part of the hot air to the fresh air blower
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DE519788C
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Device for preventing sweating in metallic air heaters heated by combustion exhaust gases
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DE481268C
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Plate air heater
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DE505934C
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Device to prevent sweating of metallic recuperative air heaters
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DE509901C
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Process for the operation of drying and firing systems connected in series
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DE518174C
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Procedure for protecting directly heated air heaters
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DE505307C
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Connection piece for air heater working in cross flow
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DE469883C
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Process for removing soot from pocket air heaters
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DE476615C
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Plate air heater assembled from groups of pockets
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DE478403C
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Plate air heater
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