Floor heating single chamber regulating valve - has several H-shaped connections on body with automatic vent valve in mixture and short circuit sections
DE2553364A1
Spring tensioned ventilation shutter - has spring moving disc to shut position on release by temperature sensitive locking device
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Spring tensioned ventilation shutter - has spring moving disc to shut position on release by temperature sensitive locking device
CH587432A5
Ventilation control valve - has semicircular flap rotating in ring with locking device engaging in ring notches
DE2417112A1
Hot-water boiler with electrically-heated oil-storage core - is separated into heating-oil container and hot-water container
DE2352865A1
Housing for centrifugal roof extract fan - is in two parts to give adjustable projection above roof
DE2349178A1
Connector for air ducts in vent shafts - has base slab channel with downwards projecting extension with side openings for pipe elbows
