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3.3.4 Direct Vent Information (continued)
Natural Gas EP Unit ONLY
2-Ply Aluminum Flex Vent
The minimum vent system for horizontal termination must consist of:
10” (254 mm) vertical length (measured to center of vent pipe) with a 90 degree bend and a
10” (254 mm) horizontal length (measured from center of vent pipe)
Wall thimble part# IMC1082A
Horizontal termination cap part # IMC1070A or IMC1070B
The maximum horizontal vent system consists of:
40’ (12192 mm) vertical length with a 7 - 90 degree bends (4 of the elbows allowed in
horizontal plane)and a 28’ (8534 mm) horizontal length (measured to center of vent pipe)
Wall thimble part# IMC1082A
Horizontal termination cap part # IMC1070A or IMC1070B
Note: Horizontal venting shall be supported, by means of a steel strap, every 3’.
The maximum vertical system consists of:
Up to 40' (12192 mm) of vertical length
Fire stop
Flashing
Collar
Adapter from flex to Simpson Dura-Vent part #P574
Termination cap part # 0991
A maximum of 4 – 90 degree bends can be used on the vertical installation with the flex vent. The
maximum height for this vent configuration is 40’ (12192 mm) and the minimum height is 4’ (1200
mm), the maximum horizontal run is a total of 28’ (8534 mm).
When fastening the flex vent to the termination and to the unit use a minimum of 3 # 8 x ½” hex head
sheet metal screws on the 4” vent and a minimum of 4 - # 8 x ½” hex head sheet metal screws on the
7” vent.
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