ECR International UTICA BOILERS MACF-115, Installation, Operation And Maintenance Manual, Page: 24 / 139

20
5 - COMBUSTION AIR AND VENT PIPING
75/100/115/125/150
Vent
Type
Vent Size
Vent
Material
Intake
(L1***)
Exhaust
(L2***)
Combined Vent
(L1+L2)
Max Min Max Min Max Min
Twin
Pipe
2"
(60 mm)
Polypropylene
85 ft
(25.9 m)
6 ft
(1.8 m)
85 ft
(25.9 m)
6 ft
(1.8 m)
170 ft
(51.8 m)
12 ft
(3.6 m)
3"
(80 mm)
Polypropylene
49 ft
(15 m)
6 ft
(1.8 m)
147 ft
(45 m)
6 ft
(1.8 m)
196 ft
(60 m)
12 ft
(3.6 m)
Flexible
Exhaust* w/
Rigid 3" PP
Intake
CPVC**
(PVC optional
on intake
ONLY)
Coaxial
Vent Size Material
Natalini DuraVent Centrotherm
Max Min Max Min Max Min
2"/4"
(60 mm/100 mm)
Polypropylene
32.8 ft
(10 m)
6 ft
(1.8 m)
27.88 ft
(8.5 m)
6 ft
(1.8 m)
24.60 ft
(8.5 m)
6 ft
(1.8 m)
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.
*** See Figures 5-8 to 5-10 for L1 & L2 details.
VENT MATERIAL OPTIONS
(Maximum Equivalent Vent Length Shown)
165/205
Vent
Type
Vent Size
Vent
Material
Intake
(L1***)
Exhaust
(L2***)
Combined Vent
(L1+L2)
Max Min Max Min Max Min
Twin
Pipe
2"
(60 mm)
Polypropylene
85 ft
(25.9 m)
6 ft
(1.8 m)
85 ft
(25.9 m)
6 ft
(1.8 m)
170 ft
(51.8 m)
12 ft
(3.6 m)
3"
(80 mm)
Polypropylene
100 ft
(30.5 m)
6 ft
(1.8 m)
100 ft
(30.5 m)
6 ft
(1.8 m)
200 ft
(60.9 m)
12 ft
(3.6 m)
Flexible
Exhaust* w/
Rigid 3" PP
Intake
CPVC**
(PVC optional
on intake
ONLY)
Coaxial
Vent Size Material
Natalini DuraVent Centrotherm
Max Min Max Min Max Min
2"/4"
(60 mm/100 mm)
Polypropylene
3"/5"
(80 mm/128 mm)
32.8 ft
(10 m)
6 ft
(1.8 m)
32.8 ft
(10 m)
6 ft
(1.8 m)
32.8 ft
(10 m)
6 ft
(1.8 m)
*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.
***See Figures 5-8 to 5-10 for L1 & L2 details.
240013503 REV A, [03/15/2022]