Box 'B-25' - Twinwall Tapered Fluebox with 23mm walls

Our Box 'B-25' is a twinwall gas flue box with a 23mm cavity between its walls giving an overall wall thickness of 25mm.

All our flue boxes are manufactured to BS715  2005 and suitable  for fires complying with BS 7977-1  2002

It is designed to be fitted prior to a fireplace installation and is designed to accept deep inset gas fires.

It comes as standard with our specially designed easy fix collar so a standard 5" flexible flue liner can be attached after fixing the box in situe. It also incorporates wire fixing tabs at the rear for use with fires that have wire fixings.

The tapered design of this box will suit most inset fires and reduce the amount of masonry removal making for an easier installation and reduces the fire catchment space volume.

All our flue boxes and components are designed by our own Gas Safe and Hetas registered installers with a combined experience of over 70 years and who use these boxes themselves every day.