I.C.E. MTI 11-300 - Manual (Page 7)

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All vent pipe joints must be sealed to prevent leakage into the heated space. Follow
instructions provided with approved venting material used. The proper vent pipe diameter
must be used, to insure proper venting of combustion products, as follows:
§ Input rating of 200 000 Btuh to 400 000 Btuh – 6” diameter
(152 mm)
§ Input rating of 75 000 Btuh to 199 999 Btuh – 5” diameter
(152 mm)
The total equivalent length of vent pipe must not exceed 50 ft (15.25m). Equivalent length
is the total length of straight sections, plus 5 ft (1.52m) for each 90 elbow and 2.5 ft (0.76m)
for each 45 elbow.
The vent system must also be installed to prevent collection of condensate. Pitch horizontal
pipe runs downward ¼ in. per foot (21 mm per meter) toward the outlet to permit
condensate drainage. Insulate vent pipe exposed to cold air or routed through unheated
areas. Insulate pipe runs longer than 10 ft (3m). Insulation should be a minimum of ½ in
thick foil face fibreglass, 1 ½ lb density. Maintain 6 in (152 mm) clearance between vent
pipe and combustible materials.
An approved Breident Type L, Field Starkap or equivalent vent cap must be provided. Vent
cap diameter must be the same as the required vent pipe diameter. The vent terminal must
be at least 12 in (305mm) from the exterior wall that it passes through to prevent
degradation of building material by flue gases. The vent terminal must be located at least
1ft (305mm) above grade, or in snow areas, at least 3ft (1m) above snow line to prevent
blockage. Additionally, the vent terminals must be installed with a minimum horizontal
clearance of 4 ft (1.2m) from electrical meters, gas meters, regulators or relief equipment.
Through the wall, vents shall not terminate over public walkways, or over an area where
condensate or vapour could create a nuisance or ha zard. Provide vent termination
clearances to building or structure features as follows:
Structure Minimum clearance
Door, Window or gravity inlet 4 ft below
4 ft horizontally
1 ft above
Forced air inlet within 10 ft 3 ft above
Adjoining building or parapet 6 ft
Adjacent public walkway 7 ft above grade
EACH APPLIANCE MUST HAVE IT’S OWN INDIVIDUAL VENT PIPE AND
TERMINAL. Do no t connect vent system from
horizontally vented units to other vent systems or chimney.
SEPARATE COMBUSTION SYSTEMS
MTI duct furnace modules may be applied to appliances for operation in separated
combustion systems. The module must be mounted with the burner section in a reasonably
airtight vestibule compartment, as these systems provide combustion air from outside the