ALTITUDE
NATURAL GASPROPANE NATURAL GASPROPANE NATURAL GASPROPANE
UH/DHMB060ACV3V 200 Not Allowed 200 Not Allowed 200 150
UH/DHMB080ACV3V 50 Not Allowed 120 Not Allowed200 150
UH/DHMC100ACV4V Not Allowed Not Allowed 60 Not Allowed 200 150
DHMD120ACV5V Not Allowed Not Allowed Not Allowed Not Allowed 200 100
NATURAL GASPROPANE NATURAL GASPROPANE NATURAL GASPROPANE
UH/DHMB060ACV3V 100 Not Allowed 100 Not Allowed 100 100
UH/DHMB080ACV3V 25 Not Allowed 60 Not Allowed 100 100
UH/DHMC100ACV4V Not Allowed Not Allowed 30 Not Allowed 100100
DHMD120ACV5V Not Allowed Not Allowed Not Allowed Not Allowed 10050
NATURAL GASPROPANE NATURAL GASPROPANE NATURAL GASPROPANE
UH/DHMB060ACV3V 50 Not Allowed 50 Not Allowed 50 38
UH/DHMB080ACV3V Not Allowed Not Allowed 30 Not Allowed 50 38
UH/DHMC100ACV4V Not Allowed Not Allowed Not Allowed Not Allowed 50 38
DHMD120ACV5V 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 PIPE2.5 INCH PIPE2 INCH PIPE
VENT LENGTH TABLE - MODULATING FURNACE
0-7000 Feet
7000-9500 Feet
9500-12000 Feet
3 or 4 INCH PIPE2.5 INCH PIPE2 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 Not Allowed Not Allowed Not Allowed Not Allowed 200 150
UHMD120ACV5V Not Allowed Not Allowed Not Allowed Not Allowed 100 100
UHMD120ACV5V Not Allowed Not Allowed Not Allowed Not Allowed 50 38
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