Fire damper assembly for sealed penetrations

A plural fire damper assembly adapted for sealed mounting in a penetration through a fire resistant wall, the assembly blocking passage of fire through said penetration, said plural fire damper assembly comprising:

• A. a plurality of fire dampers, each having a four sided, rectangular, sheet metal frame that is open front and back to define a circumferentially surrounded passageway for normal passage of air therethrough, there being a plurality of blades within the frame arranged to close the passageway to passage of air and fire therethrough upon melting of a link under heat of a fire, each damper having a height and a width and requiring expansion spaces along its height and width to accommodate thermal expansion of its components and insure complete closing of the passageway by the blades in the heat of a fire;
• B. a first outer frame for each fire damper, each first outer frame having four sheet metal sides formed in a rectangular arrangement that is open front and back to define a circumferentially surrounded passageway therethrough, each said first outer frame having a height accommodating the height and required height expansion space of its respective fire damper and having a width accomodating the width and required width expansion space of its respective fire damper, each fire damper being installed in the passageway of its respective first outer frame with the four sides of the fire damper being juxtaposed the four sides of the first outer frame and the passageways therethrough being aligned with one another, and
• C. first retainer means secured to each of said first outer frames for retaining each fire damper within its respective first outer frame while blocking the passage of air and fire through the expansion spaces between the fire damper and first outer frame and accommodating expansion of each fire damper into said expansion spaces under heat of a fire;
• D. said first outer frames being joined together to form a joined structure having said fire dampers in side by side rectangular arrangement, said joined structure having a height and a width and requiring expansion spaces along its height and width to accommodate thermal expansion of its components and insure complete closing of each fire damper passageway by the blades in the heat of a fire;
• E. a second outer frame having sheet metal sides formed in a rectangular arrangement that is open front and back to define a circumferentially surrounded passageway therethrough, said second outer frame being adapted to be sealed in the penetration and having a height accommodating the height and required height expansion space of said joined structure and having a width accommodating the width and required width expansion space of said joined structure, the joined structure being installed in the passageway of the second outer frame with the sides of the joined strcuture juxtaposed the sides of the second outer frame and the passageways therethrough being aligned with one another, and
• F. second retainer means secured to said second outer frame for retaining said joined structure within the second outer frame while blocking the passage of air and fire through the expansion spaces between the joined-structure and the second outer frame and accommodating expansion of the joined structure into said expansion spaces under heat of a fire.

A fire damper assembly adapted to be mounted in a penetration through a fire resistant wall, the assembly constructed and arranged to block passage of fire through said penetration and including vibration protection, said fire damper assembly comprising:

• A. a fire damper having a four sided, rectangular, sheet metal frame that is open front and back to define a circumferentially surrounded passageway for normal passage of air therethrough, there being a plurality of blades within the frame arranged to close the passageway to passage of air and fire therethrough upon melting of a fusible link under heat of a fire, the damper having a height and a width and requiring expansion spaces along its height and width to accommodate thermal expansion of its components and insure complete closing of the passageway by the blades in the heat of a fire;
• B. an outer frame having four sheet metal sides formed in a rectangular arrangement that is open front and back to define a circumferentially surrounded passageway therethrough, said outer frame adapted to be sealed in the penetration and having a height accommodating the height and required height expansion space of the fire damper and having a width accommodating the width and required width expansion space of the fire damper, the fire damper being installed in the passageway of the outer frame with the four sides of the fire damper being juxtaposed the four sides of the outer frame and the passageways therethrough being aligned with one another,
• C. retainer means for retaining the fire damper within the outer frame, blocking the passage of air and fire through the expansion spaces between the fire damper and outer frame and accommodating expansion of the fire damper into said expansion spaces;
• and
• D. resilient spacer means located in said height and width expansion spaces between said fire damper and outer frame for limiting movement of said fire damper in said outer frame otherwise induced by vibration while accommodating thermal expansion of said fire damper into said expansion spaces.

A fire damper assembly adapted to be mounted in a penetration through a fire resistant wall, the assembly being constructed and arranged to block passage of fire through said penetration, said fire damper assembly comprising:

• A. a fire damper having a four-sided, rectangular, sheet metal frame that is open front and back to define a circumferentially surrounded passageway for normal passage of air therethrough, there being a plurality of blades within the frame arranged to close the passageway to passage of air and fire therethrough upon melting of a fusible link under heat of a fire, the damper having a height and width and requiring expansion spaces along its height and width to accommodate thermal expansion of its components and insure complete closing of the passageway by the blades in the heat of a fire;
• B. an outer frame having four sheet metal sides formed in a rectangular arrangement that is open front and back to define a circumferentially surrounded passageway therethrough, said outer frame being adapted to be sealed in the penetration and having a height accommodating the height and required height expansion space of the fire damper and having a width accommodating the width and required width expansion space of the fire damper, the fire damper being installed in the passageway of the outer frame with the four sides of the fire damper being juxtaposed the four sides of the outer frame and the passageways therethrough being aligned with one another;
• and
• C. retainer means for retaining the fire damper within the outer frame, blocking the passage of air and fire through the expansion spaces between the fire damper and outer frame and accommodating expansion of the fire damper into said expansion spaces.

A fire damper assembly adapted to be mounted in a penetration through a fire resistant wall, which when so mounted is constructed and arranged to block passage of fire through said penetration, said fire damper assembly comprising:

• A. a fire damper having a configured sheet metal frame that is open front and back to define a circumferentially surrounded passageway for normal passage of air therethrough and a plurality of blades mounted within the frame constructed and arranged to close the passageway to passage of air and fire therethrough in response to excessive elevation of temperature in the passageway, said damper configured to require perimetric expansion spaces of its configuration so as to accommodate thermal expansion thereof sufficient to insure complete closing of the passageway by the blades when said excessive elevation of temperature occurs;
• B. an outer frame open front and back to define a circumferentially surrounded passageway therethrough, said outer frame adapted to be sealed in the penetration and having a preselected configuration for accommodating said perimetric expansion spaces of the fire damper, the fire damper being installed in said passageway of the outer frame with both of the passageways aligned with one another;
• and
• C. means for retaining the fire damper within said outer frame which block passage of air and fire through the perimetric expansion spaces between the fire damper and outer frame and accommodate expansion of the fire damper into said perimetric expansion spaces.