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For Twin Flue Systems fit the adaptors as follows:
8.4 Flue Duct Adaptor (Fig. 17)
1. Engage the flue adaptor on the boiler adaptor, making sure that it is pushed down as far as possible.
8.5 Air duct adaptor (Fig. 18)
1. Undo the screws securing the blanking plate to the boiler top panel. Discard the plate.
2. Take one of the gaskets supplied in the kit and place on the boiler top panel.
3. Using the screws previously removed secure the inlet adaptor to the top panel.
4. Continue to fit the twin flue system.