Wow!
- It's hard for us to give advice because we don't have ALL the required info. IE, does your B vent go into a mortar chimney or is the B vent your only chimney.
- You need to find a knowledgeable trades person. I do lots of diy stuff at my work and I find it very difficult to get good trades people when I need them...you are not alone.
- Don't let some of the comments here make you disregard the potential outcome of CO leaks....I know someone that was MINUTES away from death from a CO leak. At the same time, don't flip out....just get it resolved.
- Here is a source you probably don't want to take the time to study:
http://www.hartandcooley.com/vent/sizing%20guides/Gas%20vent,%20chimney%20sizing%20&%20application%20guide.pdf
...It "recommends"(doesn't prohibit) not using single wall connectors into B vent.
...While some reducing can be used in some instances, "with 4 inch "connector" you should NOT go to 3 inch B vent.
...Your install with a elbow to horizontal directly out of the heater is "least desirable" for good priming and venting.
FIND SOME GOOD HELP, SOME HOW. CALL YOUR GAS UTILITY COMPANY FOR A START.
Do you have 6 inch clearance to combustibles with your single wall??
- It's hard for us to give advice because we don't have ALL the required info. IE, does your B vent go into a mortar chimney or is the B vent your only chimney.
- You need to find a knowledgeable trades person. I do lots of diy stuff at my work and I find it very difficult to get good trades people when I need them...you are not alone.
- Don't let some of the comments here make you disregard the potential outcome of CO leaks....I know someone that was MINUTES away from death from a CO leak. At the same time, don't flip out....just get it resolved.
- Here is a source you probably don't want to take the time to study:
http://www.hartandcooley.com/vent/sizing%20guides/Gas%20vent,%20chimney%20sizing%20&%20application%20guide.pdf
...It "recommends"(doesn't prohibit) not using single wall connectors into B vent.
...While some reducing can be used in some instances, "with 4 inch "connector" you should NOT go to 3 inch B vent.
...Your install with a elbow to horizontal directly out of the heater is "least desirable" for good priming and venting.
FIND SOME GOOD HELP, SOME HOW. CALL YOUR GAS UTILITY COMPANY FOR A START.
Do you have 6 inch clearance to combustibles with your single wall??