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Combination Lock Sealed

a few questions about my wall mounted,room sealed,fully automatic gas fired combination boiler.?
1 ...where does the boiler get fresh the air from? if its the flue ..and if it cant get enough air because of a fault what will happen with the boiler itself?, will it just go into lock out mode? and shut down for good or produce carbon monoxide back in to the house??
2... if the boiler struggles for air what happens ... whats the facts?
i have a gas-safe man fixing it this week ... but i want to know what the dangers are....
3...if the boiler struggles for air then people say that it will produce carbon-monoxide ,but wouldnt the boiler just cut out as soon as the boiler starts to struggle? (lock-out)
4....are there other ways to get air in to the boiler system apart from the flue?
5....and lastly if the flue blows out the fumes how can the boiler also suck fresh air in from the same pipe at the same time???
1 and 2 blr will not fire if it can't get enough air
3 yes
4 only if the blr itself has a leaking flue system
5 the flue is two pipes in one - one draws in the air the other dispel the waste gases.
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How do i pick a Carlton suitcase combination lock?
I have not used this suitcase for over 10 years and am about to travel. It is sealed. I would like to open it and then reset the combination to something I can easily remember. Please help me.
very carefully,
the same way you pick your nose!
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