ECR International CHB-100 Manuel D'installation, D'utilisation Et D'entretien page 19

6 - COMBUSTION AIR AND VENT PIPING OF DIRECT VENT AND CATEGORY III
10.
If the horizontal vent must go through a crawl space or
other unheated space, the cool temperatures will likely
the vent pipe. Do not insulate the vent pipe. It must be
visible for monthly inspection. Insure that the vent pipe
is properly pitched away from the boiler, with no low
spots, so that condensate in the vent will drain away
from the boiler. An insulated enclosure or chase, with
access for inspection and servicing of the vent, may
be required to prevent freezing of liquid condensate.
Consult the vent pipe manufacturer's instructions for
11.
At beginning of each heating season and monthly
during the heating season, check all vent pipes and
vent terminal to make sure there are no obstructions.
Periodically clean the screen in the vent terminal.
Item
Vent
Direct vent
Air intake
Vent
Diameter
3" 5 ft
3" 5 ft
3" 5 ft
WARNING
!
Vent extending through exterior wall shall not
terminate adjacent to wall or below building
extensions such as eaves, balconies, parapets or
decks. Failure to comply could result in death or
serious injury.
65 ft
65 ft
65 ft
19
Material Standards
AL294C Stainless
Steel, Aluminum ULC S636
ANSI/ASTM
Stainelss Steel,
D2564, ANSI/
PVC, CPVC, PP,
ASTM F493, UL
Aluminum
1738/ULC636-08
AL294C Stainless
Steel, Aluminum ULC S636
UL1738,
UL1738,
EN