Nexus Manual

VENTING – GENERAL GUIDELINES

Vent Systems Termination Clearance Requirements

Structure/Object

Minimum Clearance for Termination Locations

USA CANADA

Door, window, or gravity vent inlet;

combustion air inlet for other appliances

9 in. for 10,000 to 50,000 BTU/Hr input; 12 in. for input

exceeding 50,000 BTU/Hr.

9 in. (230mm) for 10,000 to 50,000 BTU/Hr input; 12 in.

(305mm) for input exceeding 50,000 BTU/Hr.

Forced air inlet within 10 ft.

3 ft. above 6 ft. (1.8m)

Adjoining Building or parapet 10 ft. 10 ft. (3.04m)

Adjacent public walkways

7 ft. above

grade

7 ft. (2.1m) above grade

Electric, gas meters & regulators 4 ft. horizontal

3 ft. (0.9m) horizontally from meter/regulator assembly. 6 ft.

(1.8m), any direction, from a gas service regulator vent outlet

Above grade level* 1 ft. 1 ft. (0.3m)

*Minimum above maximum snow depth, or per local code, whichever is greater.

Table 5

Figure 8 – Size 50 Filter Box Assembly Installation

FILTER

GASKET

FILTER BOX

CAT-10295A

The lter box must be installed prior to unit operation. Failure to do so may result in damage

to the burner assembly.

NOTICE: The lter is only designed to prevent large debris from entering the burner assembly. If there are

other contaminants in the space air, the unit should be installed as separated combustion to take outside

air into the unit for combustion.