Bosca SPIRIT 500 Installation And Operating Instructions Manual page 11

OWNER´S MANUAL
This is a pressurized exhaust system. All vent connector joints must be sealed with 500 ºF (260 ºC)
RTV silicone sealant to ensure consistent performance and avoid smoke spillage. All horizontal
connector joints must be sealed with UL-181-AP foil tape. We recommend that all vertical vent
connector joints be secured with a minimum of 3 screws.
DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING
DO NOT INSTALL A FLUE DAMPER IN THE EXHAUST
INSTALL VENT AT CLEARANCES SPECIFIED BY THE VENT
EQUIVALENT VENT LENGTH (EVL)
The longer the run of pipe in your installation, the more restrictions there is in the system. Therefore,
larger diameter pipe should be used.
Use 4" pipe if you have more than 15 feet of equivalent vent length. Horizontal runs shall not
exceed 10 feet of EVL. It is recommended that vertical runs be a minimum of 8 feet.
To calculate EVL, use the following conversions:
90º elbow or "T"
45º elbow
Horizontal Pipe Run
Vertical Pipe Run
NOTE: At altitudes above 3,000 feet, we suggest the use of 4" diameter vent at an EVL of 7
feet or more.
ANOTHER APPLIANCE.
VENTING SYSTEM OF THIS UNIT.
MANUFACTURER.
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5 equivalent feet
3 equivalent feet
1 equivalent foot per actual foot
0.5 equivalent foot per actual foot
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