3
LP-362 Rev. 7.30.20
SYSTEM
CLEARANCE TO COMBUSTIBLES, HORIZONTAL OR VERTICAL INCH (mm)
Flexible Vent System
1.2 (30)
Table 1
D. INSTRUCTIONS
Before installation, consult the authority having jurisdiction (such as the gas utility, municipal building department,
fire prevention bureau, etc.) to determine the need to obtain a permit or for applicable local or national codes. A
venting system that extends through any area above the one where the vented appliance is located shall be
provided with an enclosure which has a fire resistance rating equal to or greater than the fire resistance rating of
the floor or roof assemblies through which it passes.
It is recommended that the venting system be checked once a year by a qualified serviceman. Special attention
should be paid to the presence of debris and signs of leakage. Failure to have this system inspected annually
can result in property damage, personal injury, or death.
Normal operation of gas burning appliances does not result in deposits of combustible soot in venting systems.
However, a poorly adjusted or malfunctioning appliance can deposit soot and other debris which can enter the
venting system. Any such accumulation should be removed and the appliances adjusted to eliminate future
accumulation. Use only a soft brush for cleaning the sections and fittings.
If any leakage is found at the joints, the connected appliances should be turned off and the leaks repaired.
No other appliance may be vented into the same chimney or chase flue with the flexible venting system. Failure
to heed this warning could result in property damage, personal injury, or death.
Plastic venting systems shall not pass through rated fire separations.
The distance between the point of termination of the system must be:
•
6’ (2 m) or more from the combustion air inlet of any appliance
•
More than 3’ (1 m) from any other building opening, gas utility meter, service regulator, etc.
•
Less distance if specified in the appliance instructions.
Contact the local building or fire officials about restrictions and installation inspection in your area.
Proper installation of the venting system and appliance is dependent on the use of all parts specified by the
manufacturer for use in particular installations. The performance of the system may be affected if the proper
assembly of all required parts is not accomplished. Acceptance and use of the venting system requires full
compliance with these installation instructions. Failure to properly install this venting system will result in
property damage, severe personal injury, or death.
Ensure the following for each installation:
•
Flex vent pipe, fittings, and termination must be used for the entire length of the vent. These products are
supplied with specific instructions. These instructions must be followed.
To prevent condensate from collecting in the flexible vent corrugations, the maximum allowable deflection
(bend) of the flexible vent is 45
o
. Since flexible vents cannot be used in a complete horizontal position, the
