Door and Hardware Systems
Patented frame seals, door bottoms, and thresholds for smoke, fire, sound, sight, security, and weatherstripping. DHSI provides the highest STC and NIC ratings. Only DHSI can provide manufacturer’s evidence that doors will close, lock, seal, and secure within NFPA 80, Life Safety, ADA, UBC 7-1 for positive pressure and 7-2 for smoke with Warnock Hersey.
Hager Companies
Hager is the only US-based provider of a complete line of door hardware, including locks, door closers, exit devices, architectural hinges, Roton geared and stainless steel continuous hinges, trim, thresholds/ weatherstripping, and sliding door hardware. Since 1849, our focus has been innovative products, exceptional value, and incomparable customer service.
Reese Enterprises 
We produce a wide variety of weatherstrips and thresholds in a range of styles, materials and finishes. Time and dollars go into our product development, research, and testing. Includes adjustable door stops, automatic door bottoms, strip doors, sound proof equipment, rain drips and door caps, shoes, and extenders. Manufacturing door products more than 80 years.
Zero International 
A leading full-line manufacturer of Sealing System Solutions for doors and windows. Integrated systems for sealing against light, sound, smoke, fire, air. Plus hinges, saddles, ramps and thresholds. Our engineering department is available for custom solutions. All components and materials manufactured in the U.S.
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See also: 08 7100 - Door Hardware
Door and Hardware Systems
Patented frame seals, door bottoms, and thresholds for smoke, fire, sound, sight, security, and weatherstripping. DHSI provides the highest STC and NIC ratings. Only DHSI can provide manufacturer’s evidence that doors will close, lock, seal, and secure within NFPA 80, Life Safety, ADA, UBC 7-1 for positive pressure and 7-2 for smoke with Warnock Hersey.
Hager Companies
Hager is the only US-based provider of a complete line of door hardware, including locks, door closers, exit devices, architectural hinges, Roton geared and stainless steel continuous hinges, trim, thresholds/ weatherstripping, and sliding door hardware. Since 1849, our focus has been innovative products, exceptional value, and incomparable customer service.
Reese Enterprises
We produce a wide variety of weatherstrips and thresholds in a range of styles, materials and finishes. Time and dollars go into our product development, research, and testing. Includes adjustable door stops, automatic door bottoms, strip doors, sound proof equipment, rain drips and door caps, shoes, and extenders. Manufacturing door products more than 80 years.
Zero International
A leading full-line manufacturer of Sealing System Solutions for doors and windows. Integrated systems for sealing against light, sound, smoke, fire, air. Plus hinges, saddles, ramps and thresholds. Our engineering department is available for custom solutions. All components and materials manufactured in the U.S.