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20
Pub. No. 22-1814-08
Maximum Vent
Length Table
VENT LENGTH TABLE
ALTITUDE MAXIMUM TOTAL EQUIVALENT LENGTH IN FEET
FOR VENT AND INLET AIR
(SEE NOTES)
0-7,000 Feet 2 INCH PIPE 2.5 INCH PIPE 3 or 4 INCH PIPE
*UH/DH2B060A9V3VA 200 200 200
*UH/DH2B080A9V3VA
*UH/DH2B080A9V4VA
50 120 200
*UH/DH2C100A9V4VA
*UH2C100A9V5VA
Not Allowed 60 200
*UH/DH2D120A9V5VA Not Allowed Not Allowed 200
7,000-9,500 Feet 2 INCH PIPE 2.5 INCH PIPE 3 or 4 INCH PIPE
*UH/DH2B060A9V3VA 100 100 100
*UH/DH2B080A9V3VA
*UH/DH2B080A9V4VA
25 60 100
*UH/DH2C100A9V4VA
*UH2C100A9V5VA
Not Allowed 30 100
*UH/DH2D120A9V5VA Not Allowed Not Allowed 100
9,500-12,000 Feet 2 INCH PIPE 2.5 INCH PIPE 3 or 4 INCH PIPE
*UH/DH2B060A9V3VA 50 50 50
*UH/DH2B080A9V3VA
*UH/DH2B080A9V4VA
Not Allowed 30 50
*UH/DH2C100A9V4VA
*UH2C100A9V5VA
Not Allowed Not Allowed 50
*UH/DH2D120A9V5VA Not Allowed Not Allowed 50
NOTES: * - First letter may be "A" or "T"
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 adapt-
ers 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" or 4" pipe and one LONG radius elbow is equivalent to 6' of 3" or 4"
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 eld supplied (except for the *UH/DH2D120 models).
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