ENERGY KINETICS Ascent Combi - L-Vent Chimney - Ek1 T Ascent Combi Only; B-Vent Chimney - Ek1 T Ascent Combi Only; Polypropylene Venting - Ek1 T+ Ascent Plus Combi Only

Ascent Combi and Ascent Plus Combi Gas – January 2024 11
L-VENT CHIMNEY – EK1T ASCENT COMBI ONLY
Ascent Combi Boilers typically have flue gas temperatures between 350°F and 450°F during normal operation. Due to
the low flue gas temperatures, L-Vent chimney pipe is suitable for use with Ascent Combi Boilers. L-Vent chimney pipe
may allow smaller chase dimensions than other chimney pipe materials and should be considered for new installations with
Ascent Combi Boilers.
1. L-Vent must be U.L. Listed to U.L. 641.
2. L-Vent to be installed in accordance with the vent manufacturer’s instructions.
3. Ascent Combi and L-Vent must be installed in strict compliance with all State and Local Codes and with the regulations
of the authorities having jurisdiction, which may differ from and which take precedence over these instructions or the
vent manufacturer’s instructions.
4. The maximum temperature rating for L-Vent is 570°F.
B-VENT CHIMNEY – EK1T ASCENT COMBI ONLY
Ascent Combi Boilers typically have flue gas temperatures between 350°F and 450°F during normal operation, but may
have higher stack temperatures when fired over 150,000 BTU/hr input; when fired over 150,000 BTU/hr input, Ascent
Combi Boilers must use Class A venting clearance to combustibles (9”). B-Vent chimney pipe may allow smaller chase
dimensions than other chimney pipe materials and should be considered for new installations with Ascent Combi Boilers.
1. B-Vent must be U.L. Listed to U.L. 441.
2. B-Vent to be installed in accordance with the vent manufacturer’s instructions.
3. Ascent Combi and B-Vent must be installed in strict compliance with all State and Local Codes and with the regulations
of the authorities having jurisdiction, which may differ from and which take precedence over these instructions or the
vent manufacturer’s instructions.
4. B-Vent is rated for gas-fired boilers ONLY and cannot be converted to oil-fired.
5. The maximum temperature rating for B-Vent is 480°F.
WARNING: Ascent Combi Boilers are rated for B-Vent to a maximum firing rate of 150,000 BTU/hr input. Higher
firing rates shall utilize Class A clearance to combustibles (9”).
POLYPROPYLENE VENTING – EK1T+ ASCENT PLUS COMBI ONLY
See supplemental “Smart Vent” installation manual for Ascent Plus Combi Only.
The Ascent Plus Combi ships with an integrated dilution-air power venter which results in positive pressure, near-
condensing flue gas. It must only be vented with Class IV venting products as outlined in the supplemental manual and
must not be vented with conventional chimney products. A total equivalent length of 50 feet of 3” polypropylene is allowed.
Subtract 5 feet from the maximum length for each elbow added. Snorkel assemblies must be included in the total
allowance for venting and intake lengths and elbows allowance calculation.
WARNING: Sidewall venting and combustion air piping from outside the building is required. The Energy Kinetics
Smart Vent kit contains specific instructions for installation that must be followed. For length of run for intake air and for the
vent connection, refer to the Smart Vent with Dilution Air installation manual. Combustion air may be supplied through PVC
pipe. An unglued or Tek-screw joint allows the door to swing down when the air inlet pipe is disconnected.