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The total length of the thru-wall exhaust vent system cannot exceed sixty-five (65) feet in length for the flue outlet. Each
elbow used is equal to ten (10) feet of straight pipe. This will allow installation in one of the four following combinations.
· 65’ of straight flue pipe.
· 55' of straight flue pipe and one elbow.
· 45' of straight flue pipe and two elbows.
· 35' of straight pipe and three elbows.
The direct vent cap is not considered in the overall length of the venting system.
The vent must be installed to prevent the flue gas leakage. Care must be taken during assembly to insure that all joints are
sealed properly and are airtight.
The vent must be installed to prevent the potential accumulation of condensate in the vent pipes. It is recommended that:
a) The vent be installed with a slight downward slope of not more than 1/4" per foot of horizontal run to the vent
terminal.
b) The vent be insulated through the length of the horizontal run.
For appliances installed in extreme cold climate, it is recommended that:
a) The vent be installed with a slight upward slope of not more than 1/4" per foot of horizontal run to the vent terminal.
In this case, an approved condensate trap must be installed per applicable codes.
b) The vent be insulated through the length of the horizontal run.
• Horizontal Thru-wall Direct Vent Termination
The direct vent cap MUST be mounted on the exterior of the building. The direct vent cap cannot be installed in a well or
below grade. The direct vent cap must be installed at least one (1) foot above ground level and above normal snow levels. The
Raypak supplied direct vent cap must be used.
NOTICE: If the boiler is vented directly out through the sidewall with no elbows and less than 6 feet of vent pipe,
a restricted direct vent cap supplied by Raypak should be utilized.
WARNING: No substitutions of flue pipe or vent cap material are allowed. Such substitutions would jeopardize the
safety and health of inhabitants.
WARNING: Pressurized common vent installations should be engineered.
NOTICE: In a catagory III installation, a 9-8 inch vent adapter must be used on the ADB 1000.
The Stainless Steel direct vent cap must be furnished by the boiler manufacturer in accordance with AGA/
CGA requirements.