Forced-draught boilers and induced-draught boilers
The Illustrated Guide to Mechanical Building Services, Third Edition (BG 31/2017), by David Bleicher, published by BSRIA in 2017, states: ‘A forced-draught boiler incorporates a fan to force combustion air into the boiler and drive the combustion gases up the flue. Induced-draught boilers have the fan located on the flue side of the boiler to draw air through, rather than push air into the boiler. For a given heat output forced/ induced-draught boilers are smaller than atmospheric boilers, and offer greater flexibility in flue routing.’
--BSRIA
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