Grant Vortex 50/90 oil boiler with open air tube spigot

[Pat100]

Grant Vortex 50/90 condensing oil boiler where the air tube spigot over the fan is not connected to the existing flue, should this be closed off with a Reillo cover plate to stop vermin getting into the open fan motor.If is blanked over will need a further combustion test to confirm adequate air source?

 

[exedon2]

If the boiler is connected to a conventional flue ie not balanced yes fit the correct reillo part in place of air hose spigot.
We actually throw away a number of these parts as they come with every Grant boiler house model.