idle thought in passing:
Most older houses have chimneys which are no longer used.
How about a core drill into the stack in the loft, and fit a bathroom type
This would vent the hot air in the loft via the chimney, which would give
additional 'pull' - you might not even need the fan :-)
Coupled with soffit vents on the north side you could have your own loft
This avoids anyone climbing on the roof and shifting tiles to fit a ridge
Only downside is the bits of brick falling doen the chimney as the core
drill breaks through .
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