Instructions / Assembly

System 1738 Installation Methods8

Flat Roof Terminations

(i) Snorkel termination: On flat roof installations the air

intake and the exhaust vent terminations must be a

minimum of 24 inches above any parapet, vertical

wall or structure within 10 feet horizontally. (see

Figure 10)

(ii) Concentric Vent Kit termination: When installing

a concentric termination vertically through a flat

roof, the termination’s vent cap must be a minimum

of 10 feet away from any parapet, vertical wall or

structure. (see Figure 11)

Figure 10: Flat Roof Snorkel Termination Figure 11: Concentric Vent Flat Roof Snorkel Termination

24" minimum

height above

If less than 10’

Intake air/vent

termination must be

minimum of 24" above

any parapet, vertical

wall or structure within

10’ horizontally

Air intake

termination

shown here

System1738

Roof Flashin

Concentric termination must

be a minimum of 10’

away from any parapet,

vertical wall or structure

System1738

Roof Flashin

These minimum code requirements are not

appliance specific. Appliance manufacturers may

supply clearance requirements specific to each

appliance. In this case, the appliance manufacturers’

requirements if more stringent shall supersede these

described herein.

The information above is in accordance with

the requirements of the 2018 edition of the NFPA

54 / ANSI Z223.1 National Fuel Gas Code. These

requirements shall always be superseded by

requirements in latest edition of the code.