Allowable Vent Lengths - Navien NR-180 Installation Manual

Gas Water Heater Installation
█ Venting:
MAX
MODEL
LENGTH
180 100'
100'
210
100'
240
NOTE: The maximum lengths listed above are for the exhaust pipe section
only. The intake air pipe length can be of equal length. The Maximum Length
are not including elbows.
The 2" diameter Sch 40 PVC venting pipe installation is a maximum 12 feet,
plus 1 elbow and elbow termination (2 elbows total) up to 2,000 feet elevation.
Installations above 2,000 feet require all 3" venting.
MODEL MAX LENGTH
180
210
240
30
Allowable 3" Venting
MAX # of
EQUIVALENT LENGTHS
ELBOWS
Reduce the maximum vent length
6
accordingly for each elbow used:
6
Each 90˚elbow equates to 5 linear feet of vent.
Each 45˚elbow equates to 2 linear feet of vent.
6
Allowable 2" Venting
MAX # OF ELBOWS
12' 2
12' 2
12' 2
REMARK
Type BH Special gas Vent
Class IIA(PVC) for Canada