How does the Rain Cap B for the duct pipe work?

These rain caps are basically a smaller pipe within a larger pipe that is mounted higher in the air around the outside of the smaller pipe.
The idea behind how this works is that rain never falls straight down and it will hit the outside, exterior  pipe and run down the side walls.
This keeps the rain from entering the smaller inner pipe where the air is being exhausted from the building.
This design allows for zero pressure loss.

Part Number

Size

A

B

C

35470

3”

6”

12”

4.5”

35471

4”

6”

16”

6.625”

35472

6”

8”

24”

8.625”

35473

8”

8”

32”

10.750”

35474

10”

8”

40”

12.750”

35475

12”

8”

48”

14”

35490

14”

8”

56”

16”

35491

16”

8”

64”

18”

35492

18”

10”

72”

20”

35493

20”

10”

80”

22”

35495

24”

12”

96”

26”

Article Title:
How does the Rain Cap B for the duct pipe work?
Article Summary:
Explanation on how rain is kept from getting into the cap
Article Date:
7/15/2011
Article ID:
906
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