hager FD22ACN, Technical Manual

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Wall fixation
112 Technical changes reserved
8.2 Flush-mounting for flush enclosures
Flush holes dimensions are given by dims H2 and 581mm in mounting instruction.
To ensure IP30 protection without door is 15mm frame regulation recommended. Frame can be regulate
until 23mm above back panel (flush high depth) and more than 35mm by flush low depth.
For hollow-wall fixation, the kit VZ405N can be used. Minimal hole dimensions for hollow-wall mounting
should be 551mm width x total height – 30mm (example: 1257mm x 551 by FU72DN). See below flush
hole needed dimensions: