Boiler Flue

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3 Jan 2026
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Hi all,

Just recently moved and have a question regarding my boiler flue.

I have a worcester greenstar 15ri with a 100/60 room sealed flue. The installation manual says 300mm from a window or opening horizontal, above or below.

However looking on building regs for a natural draught boiler flue it's states 600mm horizontal and 1500mm below. For a fan draught flue it's 300mm

My question is my flue natural draught or fan draught? As currently if it is fanned its withing building regs if it'd natural it's not.

Cheers Pete
 

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