Hydor HEB, Инструкция по установке и обслуживанию

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Optional flanges attached to edges
Optional flanges ready to be
marked and drilled with fixing
locations
7. Additional steps when your existing HE fan is part of another Hydor
product installation (such as a HE sidewall unit):
In some instances, the fixing may not be by the 4 plate mounting holes,
but by fixings through the return flange around the outside of the HE fan
plate. If this is the case, there are
2 options
for fan replacement.
Option 1
Return flanges are available as an optional extra and can be purchased
at the time of order. These will be fitted to the plate ready for you to install.
There will not be any fixing holes in the return flange supplied and these
will have to be drilled on site by the customer when fitting.