Answer / krishnamurthy

Keep the boiler furnace always in negative draft (atleast -
5 mmwC)

Answer / s.khan

boiler can be prevent of back pressure by a good draft
system,i.e balance draft.due to induced draft there is a
negative pressure in furnace but it is not good for
efficient boiler,because of in this way hot gases goes out
tgrough stack very fast without giving complete heat to water.

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