ICT International HFD8, Quick Start Manual

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7.4 Insulation:
Once installed
,
fasten the base of all needles together to prevent needles from moving
relative to each other over time. Then insulate the block on all needles bases by tightly
wrapping them with high density foam. Secure the foam tightly at the top of the stem. A
bead of Blu-tac or plasticine can be used as a boundary layer. The final installation should
then be covered with aluminium foil to reflect radiant energy
. S
ecure the foil at the top of
the stem using electrical tape
or similar
.
NOTE : it is important not to secure the insulation at the bottom of the installation to allow
air flow past the needles to maintain a stable ambient temperature.