![](/images/new-backgrounds/1058315/5831533x1.webp)
ALTITUDE | UNIT SIZE |
|
|
|
|
|
|
|
| ||
DIRECT VENT | VENT |
| NUMBER OF 90° ELBOWS |
| |||||||
FT (M) | (BTUH) |
|
| ||||||||
|
| ONLY |
|
|
|
|
|
| |||
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
| |
|
| TERMINATION | PIPE DIA | PIPE DIA | 1 | 2 | 3 | 4 | 5 | 6 | |
|
| TYPE | IN. (mm)* | IN. (mm)* | |||||||
|
|
|
|
|
|
|
| ||||
|
| 2 Pipe or | 42 | 37 | 32 | 27 | 25 | 20 | |||
|
| (12.8) | (11.3) | (9.8) | (8.2) | (7.6) | (6.1) | ||||
| 40,000 |
|
|
| |||||||
|
|
|
|
|
|
|
|
|
| ||
| Concentric | 2 (51) | 2 (51) | 57 | 55 | 53 | 51 | 49 | 47 | ||
|
| ||||||||||
|
| (17.4) | (16.8) | (16.2) | (15.5) | (14.9) | (14.3) | ||||
|
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
| |
| 60,000 | 2 Pipe or | 2 (51) | 2 (51) | 45 | 40 | 38 | 33 | 31 | 29 | |
| Concentric | (13.7) | (12.2) | (11.6) | (10.1) | (9.4) | (8.8) | ||||
|
|
|
| ||||||||
|
|
|
|
|
|
|
|
|
|
| |
|
|
| 2 (51) | 2 (51) | 30 | 25 | 14 | 9 | 7 | NA | |
|
| 2 Pipe or | (9.1) | (7.6) | (4.3) | (2.7) | (2.1) | ||||
| 80,000 |
|
|
| |||||||
9001 to 10,000‡ | Concentric | 57 | 55 | 53 | 51 | 49 | 47 | ||||
| |||||||||||
(2743 to 3048) |
|
| (17.4) | (16.8) | (16.2) | (15.5) | (14.9) | (14.3) | |||
|
|
|
| ||||||||
|
|
| 21 | 13 | 5 | NA | NA | NA | |||
|
| 2 Pipe or | (6.4) | (4.0) | (1.5) | ||||||
| 100,000 |
|
|
|
|
| |||||
| Concentric |
|
|
|
|
|
|
|
| ||
| 3 (76) | 3 (76) | 54 | 49 | 44 | 39 | 34 | 29 | |||
|
| ||||||||||
|
|
| (16.5) | (14.9) | (13.4) | (11.9) | (10.4) | (8.8) | |||
|
|
|
|
| |||||||
|
|
|
|
|
|
|
|
|
|
| |
|
|
| NA | 3 (76)† | 39 | 37 | 35 | 33 | 31 | 29 | |
|
| 2 Pipe or | (11.9) | (11.3) | (10.7) | (10.1) | (9.4) | (8.8) | |||
| 120,000 |
|
| ||||||||
| Concentric |
|
|
|
|
|
|
|
| ||
| 4 (102)† no | 4 (102)† no disk | 10 | 5 | NA | NA | NA | NA | |||
|
| ||||||||||
|
|
| disk | (3.0) | (1.5) | ||||||
|
|
|
|
|
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
|
* Disk
#If one disk is stated, separate 2 halves of perforated disk assembly and use shouldered disk half. When using shouldered disk half, install screen side toward inlet box.
† Wide radius elbow.
‡ Vent sizing for Canadian installations over 4500 ft (1370 M) above sea level are subject to acceptance by the local authorities having jurisdiction.
NOTES:
1.Do not use pipe size greater than those specified in table or incomplete combustion, flame disturbance, or flame sense lockout may occur.
2.Size both the
3.Assume two 45° elbows equal one 90° elbow. Wide radius elbows are desirable and may be required in some cases.
4.Elbows and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow count.
5.The minimum pipe length is 5 ft (1.5 M) for all applications.
6.Use
353AAV
17