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B4072
ISS B
Concept Circular Hatch Fitting & Adjustment Instructions
(To be retained in owners manual for future reference)
Concept circular hatches are for use on power craft in accordance with ISO/DIS 12216.2(E),
DESIGN CAT "A", AREAS II, III and IV. Modification of the hatch by the fitting of vents etc. will
invalidate the compliance with this standard.
Fitting Instructions
Concept circular hatches should be fitted to a flat surface with a maximum tolerance of +/- 1mm
and a deck / hull thickness of 20-40mm Check that all fastenings will be clear of deck moulding
radii etc. Allow clearance for lid opening.
Mark the deck with a pencil around the outside edge of the frame flange.
It is essential that the frame is a snug fit with the deck opening.
When fitting a number of hatches it is advisable to prepare a template.
Cut out deck along pencil line using a suitable saw.
Where the deck is of composite construction, it is recommended that the exposed laminate be
sealed with the appropriate material prior to fitting the hatch. Openings cut in metal decks should
have all burrs and sharp edges removed.
Hatches should not be considered as stiffening members and it is recommended that the deck be
adequately stiffened to prevent distortion during heavy weather.
Re-check the frame on aperture and then apply bedding compound to the channel in lower frame.
Bedding compound must have good adhesive qualities (eg. silicone sealant), be a suitable grade
for marine sealing applications, of 3mm minimum thickness and compressible to allow the lower
frame to be pulled down in contact with the deck by the securing screws.
Position lower frame over hole and drill all holes and fasten down with the appropriate stainless
steel fasteners (see below). Start with those nearest the hinge, taking care not to damage the
acrylic.
Deck type
Wood M5 through bolts or marine grade wood screws.
GRP/Steel/Al Alloy M5 through bolts or machine screws into suitable tapped plates.
Fixing Sizes M5, 10UNC, 2BA, 3/16", Wood screws (min. length 40mm).
Once installed check for correct operation of the hatch lid, ie. closing/locking, even pressure of
seal etc.
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