UTICA BOILERS MAH-100 Manual page 24

5 - COMBUSTION AIR AND VENT PIPING
(Maximum Equivalent Vent Length Shown)
Vent
Vent Size
Type
2"
(60 mm)
Twin
Pipe
3"
(80 mm)
Vent Size
2"/4"
Coaxial
(60 mm/100 mm)
3"/5"
(80 mm/128 mm)
*For vertical runs only
**In Canada ULC S636 and in the USA UL1738 schedule 40 CPVC are the only approved Vent Material to be used as
an alternative to Polypropylene venting for the exhaust pipe.
Vent
Vent Size
Type
2"
(60 mm)
Twin
Pipe
3"
(80 mm)
Vent Size
2"/4"
Coaxial
(60 mm/100 mm)
3"/5"
(80 mm/128 mm)
*For vertical runs only
**In Canada ULC S636 and in the USA UL1738 schedule 40 CPVC are the only approved Vent Material to be used as
an alternative to Polypropylene venting for the exhaust pipe
VENT MATERIAL OPTIONS
100/115/125/150
Intake
Vent
(L1)
Material
Max
85 ft
Polypropylene
(25.9 m)
Polypropylene
Flexible
Exhaust* w/
Rigid 3" PP
49 ft
Intake
(15 m)
CPVC**
(PVC optional
on intake
ONLY)
Natalini
Material
Max
32.8 ft
(10 m)
Polypropylene
165/205
Intake
Vent
(L1)
Material
Max
85 ft
Polypropylene
(25.9 m)
Polypropylene
Flexible
Exhaust* w/
Rigid 3" PP
100 ft
Intake
(30.5 m)
CPVC**
(PVC optional
on intake
ONLY)
Natalini
Material
Max
Polypropylene
32.8 ft
(10 m)
20
Exhaust
(L2)
Min Max Min
6 ft 85 ft
(1.8 m) (25.9 m) (1.8 m)
6 ft 147 ft
(1.8 m) (45 m) (1.8 m)
DuraVent
Min Max Min
6 ft 27.88 ft
(1.8 m) (8.5 m) (1.8 m)
Exhaust
(L2)
Min Max Min
6 ft 85 ft 6 ft
(1.8 m) (25.9 m) (1.8 m)
6 ft 100 ft 6 ft
(1.8 m) (30.5 m) (1.8 m)
DuraVent
Min Max Min
6 ft 32.8 ft 6 ft
(1.8 m) (10 m) (1.8 m)
Combined Vent
(L1+L2)
Max Min
6 ft 170 ft 12 ft
(51.8 m) (3.6 m)
6 ft 196 ft 12 ft
(60 m) (3.6 m)
Centrotherm
Max Min
6 ft 24.60 ft 6 ft
(8.5 m) (1.8 m)
Combined Vent
(L1+L2)
Max Min
170 ft 12 ft
(51.8 m) (3.6 m)
200 ft 12 ft
(60.9 m) (3.6 m)
Centrotherm
Max Min
32.8 ft 6 ft
(10 m) (1.8 m)
240013354 REV B [09/15/2021]