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37
(6) In judging the costs of alternative works of adaptation the cost of the
appliance, the cost of installation and the cost of incidental works should
be viewed as a whole.
Example: The replacement of a grate with cast iron fire back by a
simple open fire may in total be more expensive than the installation
of a free standing convector fire which can be fitted without removing
the existing fire back.
(7) The cost of new appliances may in most cases bo judged reasonable if