^k Construction No. F.H. 20. Grooves and coil are placed on face of wall. Door iscounterbalanced by springs and operated by means of end-less chain, sprocket and gear. When used as a fire-door itcan, if required, be equipped with an automatic closingdevice. Special designs will be furnished on… … Mil
Masonry · Brick · Terra Cotta · Metals · Metal Fabrication · Structural Metal Framing · Thermal and Moisture Protection · Finishes · Plaster and Gypsum Board · Openings · Roof Windows and Skylights · Doors · Conveying Equipment · Elevators · Equipment · Food service Equipment · Food Cooking Equipment · Office Equipment · Electrical engineering · Lighting · Interior lighting · Lighting Fixtures · Plumbing · Plumbing Piping and Pumps · HVAC · Central Heating Equipment · Furnaces · Heating Boilers · Specialty Construction · Vaults · Construction Materials
Internet Archive · Building Technology Heritage Library · Public Domain Mark 1.0. Free to use for anything.
