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Posted by HeatPro on January 07, 2009 at 15:03:23:
In Reply to: Draft Hoods posted by Chez on January 07, 2009 at 14:55:55:
Draft hoods are available in sizes of the top exit of the appliance at local plumbing/heating supply houses that carry duct pieces.
It would be a better idea to get a draft damper that stops the boiler from firing until the stack damper opens, as in most modern atmospheric boiler sold for the past 30 years since the use of electronic ignitions.
: About all I know is that the draft hood allows air from the boiler room to cool the chimney and reduce convection.
++ the idea isn't to cool the chimney nor to reduce convection, it is there to prevent downdrafts by causing any downdraft to leave the sides of the hood instead of forcing downward against the fire inside the heater. It does break the draft so the fire isn't sucked upward to make a bad burn in the fire box (and maybe blow a pilot light out) as well.