Ideal Combustion Chamber Closure 177991

The Ideal 177991 is a combustion chamber closure, also listed as a fumes chamber closure. It forms the sealed boundary of the combustion chamber on Ideal Commercial Evojet appliances, closing off the chamber so that products of combustion are contained and directed into the flue path rather than escaping into the appliance casing or the room.

Because it sits directly in the heat and flue gas path, the closure is exposed to sustained thermal cycling and condensate attack over its service life. It is a serviceable component and is replaced as a complete part.

• Soot staining or blackening around the chamber joint or closure face
• Visible corrosion, cracking, distortion or heat damage to the closure plate
• Flue gas readings outside the expected range, or a combustion analysis that cannot be brought into specification
• A failed seal at the chamber joint, with evidence of leakage past the closure
• The closure no longer seating correctly after the chamber has been opened for service

• This part is fitted to a gas appliance; installation must be carried out by a Gas Safe registered engineer.
• Confirm the appliance model and serial number against the compatibility list before ordering, as Evojet variants differ.
• Quote part number 177991, or the alternative number 4035910, when checking the part against the appliance.
• Inspect the existing chamber seal or gasket while the appliance is open and replace it if it shows any sign of hardening or damage.