Warning
The instructions of the appliance manufacturer with regard to the minimum trap height of condensate drain
must be followed. If the height is not enough the flue gases can be blown out under a locked vent condition
before the appliance’s blocked vent detection system can function.
Additional instructions for termination through a roof with a roof terminal:
The vent system must terminate at least 2 feet above the roof line or any wall or vertical structure
within 10 feet.
Always secure the roof terminal with its support clamp.
Do not install an extra rain cap on the terminals. The terminals are specially designed for high
efficiency boilers which produce large quantities of combustion gases. The design allows rain to
enter the terminals which also severs to dilute acidic condensate. However, a drain must be
incorporated to allow condensation and rainwater to escape from the venting system. The drain
must include a trap to prevent combustion gases from entering the living space.
Fire stops
Whenever the venting system penetrates a floor or ceiling and is not running in a fire-rated shaft, a fire-stop
is required. Nail the fire stop to the structure and pass the venting sections through the hole. See figure 4.16.
Figure 4.16 Fire stop
Mounting instructions for roof terminal Installation:
1. Check the flue terminal for possible damage before installation. If damage is evident replace the flue
terminal with one that is free from damage.
2. Choose the appropriate weather collar in accordance with the roofing. For pitched roofs choose synthetic
tile, universal pitched roof flashing. For flat roofs choose aluminium flat roof flashing. See figure 4.17.
Figure 4.17 Fire stop Weather collar
3. Determine the location of the roof penetration. See figure 4.18.
4. Cut a hole from the exterior of the roof. Assure that no wood shavings, dust or dirt drop into the boiler
exhaust or air intake piping. See figure 4.18.
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