Low leak backdraft damper for hvac system

Abstract

A damper is disclosed. The damper includes a blade having a slot, a jamb frame member having a hole, and a bearing for connecting the blade to the jamb frame member. The bearing has a first portion receivable in the slot of the blade and a second portion receivable in the hole on the jamb frame member to facilitate rotational movement of the blade.

What is claimed is: 
     
         1 . A damper comprising:
 a blade having a slot;   a jamb frame member having a hole; and   a bearing having a first portion receivable in the slot of the blade, and a second portion receivable in the hole on the jamb frame member to facilitate rotational movement of the blade.   
     
     
         2 . The damper of  claim 1 , wherein the first portion and the second portion of the bearing are co-axial. 
     
     
         3 . The damper of  claim 1 , wherein the second portion is rotatable in the hole of the jamb frame member. 
     
     
         4 . The damper of  claim 1 , wherein the first portion locks with the blade such that the bearing rotates with the blade. 
     
     
         5 . The damper of  claim 4 , wherein the first portion has a hexagonal outer shape, and the slot has a complementary hexagonal shape to facilitate rotation of the bearing along with the blade. 
     
     
         6 . The damper of  claim 1 , wherein the slot is configured at a top portion of the blade. 
     
     
         7 . The damper of  claim 1 , further comprising a jamb seal connected to the jamb frame member to seal space between the blade and the jamb frame member. 
     
     
         8 . A bearing comprising:
 a first portion configured to be received in a slot of a blade of a damper; and   a second portion receivable in a hole on a jamb frame member of the damper to facilitate rotational movement of the blade.   
     
     
         9 . The bearing of  claim 8 , wherein the second portion extends from the first portion. 
     
     
         10 . The bearing of  claim 8 , wherein the first portion has one or more locking features configured to lock the bearing with the blade to facilitate rotation of the bearing along with the blade. 
     
     
         11 . The bearing of  claim 10 , wherein the first portion has a hexagonal outer shape configured to be locked with an internal surface  234  of the slot of the blade. 
     
     
         12 . A damper comprising:
 one or more blades;   a jamb frame member; and   a jamb seal connected to the jamb frame member to seal space between the blade(s) and the jamb frame member.   
     
     
         13 . The damper of  claim 12 , wherein the jamb frame member has a recess to receive an edge of the jamb seal. 
     
     
         14 . The damper of  claim 13 , wherein the recess has a c-shaped cross-section and wherein the edge of the jamb seal has a circular cross-section. 
     
     
         15 . The damper of  claim 12 , wherein the jamb seal is made of a flexible material. 
     
     
         16 . The damper of  claim 12 , wherein the jamb seal extends along the length of the jamb frame member and is positioned on a rear side of the blades. 
     
     
         17 . The damper of  claim 12 , further comprising a sealing member extending along a free end of the one or more blades. 
     
     
         18 . The damper of  claim 17 , wherein the sealing member is made of a flexible material. 
     
     
         19 . The damper of  claim 17 , wherein an edge of the sealing member is received within a recess extending along the free end of the blade, the edge of the sealing member having a circular cross section that mates with the recess. 
     
     
         20 . The damper of  claim 17 , wherein the sealing member extends at an angle from the free end of the one or more blades.