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Vent/Air System Clearance Requirements

Vent/Air System Installation

Vent/Air System Clearance

Requirements

The vent/air system may maintain zero clear-

ance to combustible & non-combustible materi-

als.

Determine Termination Location

1. The maximum equivalent length of the

concentric vent/air system should not

exceed 100Ft (excluding the termination).

For each 90º elbow in the system, the

equivalent length is reduced by 10 feet.

For each 45º elbow in the system, the

equivalent length is reduced by 5 feet.

2. The installer must consider the following

when determining the location of the vent/

air system termination:

• Avoid areas where flue vapors may dam-

age surrounding shrubs, plants or air

conditioning equipment or be objection-

able to the end user.

• Avoid areas where the condensate

plume of the flue products could

obstruct window views.

• Avoid areas where prevailing winds

could cause a buildup of water/ice in the

combustion air inlet due to freezing of

flue condensate.

• Avoid locations with possibility of expo-

sure of persons or pets to flue vapors.

• Avoid locations where prevailing winds

cause recirculation of the flue gases,

such as inside corners of buildings or

near adjacent buildings or vertical sur-

faces, window wells, stairwells, alcoves,

courtyards, or other recessed areas.

• Do not terminate above any doors or

windows; flue condensate could freeze

causing ice formations.

• Locate or guard the termination to pre-

vent possible condensate damage to

exterior finishes.

3. Maintain the following clearances to the

termination:

• At least 3 feet from adjacent walls

• No closer than 3 feet below roof over-

hangs

• At least 7 feet above any public walk-

ways

• At least 3 feet above any forced air

intake (does not include the combustion

air inlet) within 10 feet.

Figure 4: Termination Clearances of Direct Vent

Systems

• At least 4 feet from any electric meters,

gas meters, gas meter-regulators, relief

valves or other equipment. Never termi-

nate above or below any of these items

within 4 feet horizontally.

• Must maintain 12-inch clearances below

and horizontally from doors and win-

dows.

• Air intake must terminate at least 12

inches above grade or anticipated snow

line as shown in Figure 5.

GF-125V