Kitchen exhaust removes indoor pollutants through a dedicated duct, while attic vents serve the roof space. Document both systems separately and preserve required duct and termination details during roof work.
Give each system its own label
When planning a roof replacement, list the kitchen exhaust outlet separately from attic vents, plumbing vents and bathroom outlets. Ask the roofer to identify which penetrations will be removed or replaced. If a hood was installed during a kitchen remodel, provide its available product information and contractor records. An unlabeled roof cap invites assumptions about what it serves and who is responsible for reconnecting it.
Clarify the mechanical handoff
Have the appropriate mechanical contractor confirm the duct and termination requirements for the equipment. The roofing scope should identify its weatherproofing work without pretending to establish the hood's complete operating design. Ask how the duct connection will be protected during tear-off and who checks it afterward. If the roof cap changes, coordinate that decision before installation instead of treating an externally similar cap as an automatic substitute.
Keep an operational closeout
After the work, retain a record identifying the outlet, connected appliance and responsible contractor. Ask for confirmation of the connection and equipment operation within the agreed scope. A photograph of finished roofing around a cap cannot show everything inside the duct route. If the kitchen remains smoky or humid, report the actual symptoms to the mechanical contractor rather than assuming additional attic ventilation is the correction. The two systems need separate findings and separate responsibilities.
If the kitchen renovation and roof replacement are happening under separate contracts, arrange a written handoff between their scopes. Ask whether the hood will remain in service during the roof work and who will communicate any interruption to occupants. Keep that operational question distinct from the installation detail, but resolve both before the penetration is opened and the roof crew is waiting.
For related project preparation, see roof ventilation changes during replacement and roof replacement sequencing with attic insulation work. Bring the relevant photographs and existing proposal to Perkins when discussing the roof-specific scope.
Technical references: PNNL: checking exhaust discharge outdoors; PNNL: bathroom exhaust fans. These references provide background; the selected assembly and applicable project requirements determine the installation detail.