Barnebey & Sutcliffe

link to home page Link to Continental Carbon website

205 W. Main Street, Kirkersville, Ohio 43033
Tel: 740-919-4966 - Toll Free: 833-919-4966


BTD Series

The Barnebey Sutcliffe Bubble Tight Isolation Damper (BTD) is designed for isolation of critical filter trains or environmental emission control systems during change-out, decontamination, shut-down, and/or testing services without disabling the entire system or risking air emissions that could affect EPA compliance. Damper operation can be manual or electric. Dampers can be manufactured out of 304 stainless steel. Other materials available upon request.

Square and Round BTD

Square BTD                                                                         Round BTD


BTDs can be used in:

• Room isolation
• Containment housings
• Dust collectors
• Building isolation systems

The damper is also available with a bubble tight certification per ANSI test method N510-1980. In a hazardous atmosphere, the Series BTD Isolation Damper enables the system to be isolated for decontamination, filter change-out or to allow scan testing by an auxiliary air supply system. In a nonhazardous atmosphere, it prevents particulates or vapor phase chemical contaminates from reaching the atmosphere or other equipment and processes to which the system being isolated may be connected.

Design Specifications

BTD Isolation Dampers are available for either round or square duct in temperatures ranging from -50° F to 375° F. The damper is designed with a single blade mounted to a shaft with a fabricated flange frame. The damper contains a full circumference silicone blade seal that is retained by a steel clamp ring fastened by hex nuts. Manual or electric actuators can be supplied as required.

The blade seal is field adjustable and replaceable. The shaft is supported in self-lubricating TFE lined filament wound bearings mounted external to the damper frame with O-ring shaft seals.

Standard sizes range from 8" to 36" round and custom sizes are also available.

Square BTD

The square BTD attaches directly to the containment housing, which eliminates the need for transitions between the housing and damper as is required when using the round BTD. Damper housing is 24" square duct with a flange total width of 27"; a total flange height of 30"; and adds 26 ½" to the length of the containment unit. Damper operation can be manual, electric, or pneumatic.

Damper Dimensional Chart


Safety Message

Activated carbon preferentially removes oxygen from air. In closed or partially closed containers and vessels, oxygen depletion may reach hazardous levels. If workers are to enter a vessel containing carbon, appropriate sampling and work procedures for potentially low oxygen spaces should be followed, including all applicable Federal and State requirements.


  Download a PDF of this product