AIR FILTER ASSEMBLY FOR HEAT RECOVERY VENTILATION UNIT

Abstract

The invention relates to an air filter assembly (1) for a heat recovery ventilation unit. The air filter assembly comprises a frame (2) and a filtering element (3) fixed within said frame (2). The frame (2) comprises a first frame portion (2a) having a first height; a second frame portion (2b) opposite said first frame portion (2a) and having a second height; a third frame portion (2c); and a fourth frame portion (2d) opposite said third frame portion (2c). The third and fourth frame portions (2c, 2d) each extend between said first and second frame portions (2a, 2b). The second height is greater than the first height of said first frame portion. A height of said third frame portion (2c) is comprised between said first and second heights; and a height of said fourth frame portion (2d) is comprised between said first and second heights.

Claims

1. An air filter assembly (1) for a heat recovery ventilation unit, said air filter assembly comprising a frame (2) and a filtering element (3) fixed within said frame (2), wherein said frame comprises: a first frame portion (2a) having a first height; a second frame portion (2b) opposite said first frame portion (2a) and having a second height; a third frame portion (2c); and a fourth frame portion (2d) opposite said third frame portion (2c); said third and fourth frame portions (2c, 2d) each extending between said first and second frame portions (2a, 2b), wherein said second height is greater than said first height of said first frame portion; a height of said third frame portion (2c) is between said first and second heights; and a height of said fourth frame portion (2d) is between said first and second heights.

2. The air filter assembly as defined in claim 1, wherein a thickness of said filtering element (3) is smaller than or equal to said first height of said first frame portion (2a).

3. The air filter assembly as defined in claim 1, wherein said filtering element (3) is a pleated filter.

4. The air filter assembly as defined in claim 1, wherein at least one of said first, second, third and fourth frame portions (2a, 2b, 2c, 2d) is a straight frame portion.

5. The air filter assembly as defined in claim 4, wherein said at least one straight frame portions (2a, 2b, 2c, 2d) comprises a sealing flap (4, 5) on its outside.

6. The air filter assembly as defined in claim 1, wherein said first and second frame portions (2a, 2b) are straight frame portions extending parallel to each other.

7. The air filter assembly as defined in claim 1, wherein said third and fourth frame portions (2c, 2d) are straight frame portions extending parallel to each other.

8. The air filter assembly as defined in claim 1, wherein at least one of said first, second, third and fourth frame portions is a curved frame portion.

9. The air filter assembly as defined in claim 1, further comprising oversize polymer/plastic bag enclosing the air filter assembly.

10. The air filter assembly as defined in claim 9, wherein said oversize bag comprises at least one glove portion or mitten portion.

11. The air filter assembly as defined in claim 10, wherein said oversize bag comprising a left-hand glove portion or mitten portion and a right-hand glove portion or mitten portion.

Description

BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS

[0034] FIG. 1A is a perspective view of a first embodiment of an air filter assembly according to the invention;

[0035] FIG. 1B is a side view of the first embodiment;

[0036] FIG. 2A is a perspective view of a second embodiment of the air filter assembly according to the invention; and

[0037] FIG. 2B is a side view of the second embodiment.

DETAILED DESCRIPTION OF THE INVENTION

[0038] Referring to FIG. 1A, a perspective view of a first embodiment of an air filter assembly 1 according to the invention is shown. The air filter assembly 1 can be inserted in a heat recovery ventilation unit (not shown). The air filter assembly 1 comprises a frame 2 and a filtering element 3 fixed within said frame 2. The frame 2 comprises a first frame portion 2a having a first height, a second frame portion 2b opposite said first frame portion 2a and having a second height, a third frame portion 2c and a fourth frame portion 2d opposite said third frame portion 2c. The third and fourth frame portions 2c, 2d each extend between said first and second frame portions 2a, 2b. The second height of said second frame portion 2b is greater than the first height of said first frame portion 2a. A height of said third frame portion 2c is comprised between said first and second heights, and a height of said fourth frame portion 2d is comprised between said first and second heights.

[0039] The first and second frame portions 2a, 2b are straight frame portions. Each of them comprises a sealing flap 4, 5 on its outside.

[0040] The filtering element 3 is a pleated filter where the direction of the pleats is parallel to said third and fourth frame portions 2c, 2d.

[0041] Referring to FIG. 1B, a side view of the first embodiment is shown. The upper pleats of the filtering element 3 are shown as a straight dashed line.

[0042] Referring to FIG. 2A, a perspective view of a second embodiment of the air filter assembly according to the invention is shown.

[0043] The second embodiment is almost identical to the first embodiment. The only difference is the direction of the pleats. The filtering element 3 is a pleated filter where the direction of the pleats is parallel to said first and second frame portions 2a, 2b.

[0044] Referring to FIG. 2B, a side view of the second embodiment is shown. The pleats of the filtering element 3 are shown as a dashed zigzag line.