18-CD30D1-12
19
Installer’s Guide
Connection of the vent pipe to the vent collar should
also be accomplished using RTV type sealant. This type
sealant provides a connection which remains flexible and
can be separated in the future if service needs require
the removal of the Vent Pipe for service or clearance.
The vent length Table 10 above shows the required vent
lengths for installations at various altitudes. Optional high
altitude kits are available for installations above 5000
feet (Installations above 12,000 feet are not allowed) as
follows:
For Canadian applications, use the appropriate tables in
the latest edition of the National Fuel Gas Code (ANSI
Z223.1 • CAN/CGA B149.1 Installation Codes or “Exhibit
J” of ANSI Z21.47 • CAN/CGA-2.3 Standards. “Exhibit
J” includes examples and drawings of typical venting
systems.
TABLE 10
ALTITUDE
NATURAL GAS
PROPANE
NATURAL GAS
PROPANE
NATURAL GAS
PROPANE
UHMB060ACV3V
DHMB060BCV3V
200
Not Allowed
200
Not Allowed
200
150
UH/DHMB080ACV3V
50
Not Allowed
120
Not Allowed
200
150
UH/DHMC100ACV4V
Not Allowed
Not Allowed
60
Not Allowed
200
150
DHMD120BCV5V
UHMB060ACV3V
DHMB060BCV3V
UH/DHMB080ACV3V
UH/DHMC100ACV4V
DHMD120BCV5V
UHMB060ACV3V
DHMB060BCV3V
UH/DHMB080ACV3V
UH/DHMC100ACV4V
DHMD120BCV5V
Not Allowed
Not Allowed
Not Allowed
Not Allowed
200
100
NATURAL GAS
PROPANE
NATURAL GAS
PROPANE
NATURAL GAS
PROPANE
100
Not Allowed
100
Not Allowed
100
100
25
Not Allowed
60
Not Allowed
100
100
Not Allowed
Not Allowed
30
Not Allowed
100
100
Not Allowed
Not Allowed
Not Allowed
Not Allowed
100
50
NATURAL GAS
PROPANE
NATURAL GAS
PROPANE
NATURAL GAS
PROPANE
50
Not Allowed
50
Not Allowed
50
38
Not Allowed
Not Allowed
30
Not Allowed
50
38
Not Allowed
Not Allowed
Not Allowed
Not Allowed
50
38
Not Allowed
Not Allowed
Not Allowed
Not Allowed
50
25
Notes: * - First letter may be "A" or "T", ** - Last two digits may be "A" thru "Z"
1. Minimum vent length for all models: 3' horizontal or 3' vertical
2. DO NOT MIX PIPE DIAMETERS IN THE SAME LENGTH OF PIPE OUTSIDE THE FURNACE CABINET, (Except
adapters at the top of the furnace). If different inlet and vent pipe sizes are used, the vent pipe must adhere to the
maximum length limit shown in the table above (See note 6 below for exception). The inlet pipe can be of a larger
diameter, but never smaller than the vent pipe.
3. MAXIMUM PIPE LENGTHS MUST NOT BE EXCEEDED! THE LENGTH SHOWN IS NOT A
COMBINED TOTAL, IT IS THE MAXIMUM LENGTH OF EACH (Vent or Inlet air pipes).
4. One SHORT radius 90° elbow is equivalent to 10' of 3" pipe and one LONG radius elbow is equivalent to 6' of 3"
pipe. One 90° elbow is equivalent to 7½' of 2½" pipe or 5' of 2" pipe. Two 45° elbows equal one 90° elbow.
5. The termination tee or bend must be included in the total number of elbows. If the BAYAIR30AVENTA termination
kit is used, the equivalent length of pipe is 5 feet. BAYVENT200B equivalent length is 0 feet.
6. Pipe adapters are field supplied. Downflow models, UHM 100 and UHM 120 models include
the 2" x 3" adapter.
3 or 4 INCH PIPE
3 or 4 INCH PIPE
2.5 INCH PIPE
2 INCH PIPE
VENT LENGTH TABLE - MODULATING FURNACE
0-7000 Feet
7000-9500 Feet
9500-12000 Feet
3 or 4 INCH PIPE
2.5 INCH PIPE
2 INCH PIPE
2 INCH PIPE
2.5 INCH PIPE
MAXIMUM TOTAL EQUIVALENT LENGTH IN FEET FOR VENT AND INLET
AIR (SEE NOTES)
7. For Canadian applications ONLY, IPEX 196006 may be used for horizontal and vertical terminations. IPEX 081216,
IPEX 081218, and IPEX 081219 may only be used for horizontal vent terminations. Equivalent lengths are
IPEX 196009 = 5 feet, IPEX 081216 = 11 feet, IPEX 081218 = 16 feet, and IPEX 081219 = 21 feet
UHMD120ACV5V
UHMD120ACV5V
UHMD120ACV5V
Not Allowed
Not Allowed
Not Allowed
Not Allowed
200
150
Not Allowed
Not Allowed
Not Allowed
Not Allowed
100
100
Not Allowed
Not Allowed
Not Allowed
Not Allowed
50
38
For *UHM/DHMB060 use BAYSWT07AHALTA.
For *UHM/DHMB080, C100 use BAYSWT09AHALTA.
For *UHM/DHMD120 use BAYSWT08AHALTA.
