Air and debris dam for moving coil balance assembly

1. An air and debris dam for installation in a jamb channel of a hung window assembly between a carrier of a moving coil window balance and a tilt latch of a window sash, the jamb channel having a width and a depth and defined by a first wall, a second wall opposite the first wall, and third and fourth walls disposed perpendicular to the first and second walls, the first wall comprising a vertically extending slot, the air and debris dam comprising:

a first portion comprising a generally rectangular prism geometry, having a first dimension generally corresponding to the width of the jamb channel and a second dimension generally corresponding to the depth of the jamb channel; and

a second portion extending generally along the first dimension of the first portion and projecting from a first surface of the first portion such that the second portion extends through the vertically extending slot and toward the window sash when the air and debris dam is installed in the jamb channel, the second portion comprising a generally triangularly-shaped cross-section having a base extending along a height of the first portion; and

wherein the air and debris dam is movable independently from each of the carrier and the tilt latch and along an uncurled portion of a curl spring of the moving coil window balance.

2. The air and debris dam of claim 1 , wherein the air and debris dam is movable vertically upward in the jamb channel in response to the carrier bearing against a lower end of the first portion; and

wherein the air and debris dam is movably vertically downward in the jam channel in response to the tilt latch bearing against an upper end of the first portion.

3. The air and debris dam of claim 2 , wherein the air and debris dam is formed from a cellular foam resilient material that is flexible and elastically deformable.

4. The air and debris dam of claim 3 , wherein the second dimension of the first portion is greater than the depth of the jamb channel.

5. The air and debris dam of claim 4 wherein the second portion projects a distance about the same as the depth of the first portion.

6. The air and debris dam of claim 4 wherein the second portion projects a distance greater than the depth of the first portion.

7. An air and debris dam for installation in a jamb channel of a hung window assembly between a carrier of a moving coil balance assembly and a tilt latch of a window sash, the jamb channel having a width and a depth and defined by a first wall, a second wall opposite the first wall, and third and fourth walls disposed perpendicular to the first and second walls, the first wall comprising a vertically extending slot, the air and debris dam comprising:

a base portion having a generally rectangular prism geometry and comprising a first dimension generally corresponding to the width of the jamb channel and a second dimension generally corresponding to the depth of the jamb channel; and

a projection portion extending generally along the first dimension of the base portion and projecting from the base portion through the vertically extending slot when the air and debris dam is installed within the jamb channel, the projection portion having a width that is greater than a width of the vertically extending slot;

wherein the projection portion and the base portion cooperate to form an opening therebetween in which a portion of the first wall is received when the air and debris dam is installed within the jamb channel; and

wherein the air and debris dam is movable independently from each of the carrier and the tilt latch.

8. The air and debris dam of claim 7 , wherein the air and debris dam is movable vertically upward in the jamb channel in response to the carrier bearing against a lower end of the base portion; and

wherein the air and debris dam is movably vertically downward in the jam channel in response to the tilt latch bearing against an upper end of the base portion.

9. The air and debris dam of claim 8 , wherein the air and debris dam is formed from a cellular foam resilient material that is flexible and elastically deformable.

10. The air and debris dam of claim 9

wherein the projection portion projects a distance greater than the second dimension of the base portion.

11. The air and debris dam of claim 10 , wherein the second dimension of the base portion is greater than the depth of the jamb channel.

12. The air and debris dam of claim 10

wherein the projection portion projects a distance about the same as the depth of the base portion.

13. A moving coil window balance assembly for installation in a window assembly, the window assembly comprising a window sash having a tilt latch disposed in a jamb channel, the jamb channel having a width and a depth and defined by a first wall, a second wall opposite the first wall, and third and fourth walls disposed perpendicular to the first and second walls, the first wall comprising a vertically extending slot, the window balance assembly comprising:

a carrier assembly comprising a curl spring and configured to engage the window sash;

a mounting bracket attached to the window jamb and positioned vertically above the carrier assembly in the jamb channel, the mounting bracket configured to engage an uncurled end of the curl spring; and

an resilient and elastically deformable air and debris dam disposed in the jamb channel between the carrier assembly and the tilt latch of the window sash, the air and debris dam comprising:

a first portion comprising a generally rectangular prism geometry, having a first dimension generally corresponding to the width of the jamb channel and a second dimension greater than the depth of the jamb channel; and

a second portion extending generally along the first dimension of the first portion and projecting from a first surface of the first portion such that the second portion is configured to extend through the vertically extending slot and toward the window sash, the second portion comprising a generally triangularly-shaped cross-section; and

wherein the air and debris dam is movable vertically upward in the jamb channel in response to the carrier assembly bearing against a lower end of the first portion; and

wherein the air and debris dam is movably vertically downward in the jam channel in response to the tilt latch bearing against an upper end of the first portion.

14. The air and debris dam of claim 13 wherein the second portion projects a distance about the same as the second dimension of the first portion.

15. The air and debris dam of claim 13 wherein the second portion projects a distance greater than the second dimension of the first portion.